3.4. ArrayList

PHOTO

Mon Sep 19 2022 02:36:13 GMT+0000 (Coordinated Universal Time)

package org.launchcode.java.demos.collections;

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

public class ArrayListGradebook {

   public static void main(String[] args) {

      ArrayList<String> students = new ArrayList<>();
      ArrayList<Double> grades = new ArrayList<>();
      Scanner input = new Scanner(System.in);
      String newStudent;

      System.out.println("Enter your students (or ENTER to finish):");

      // Get student names
      do {
         newStudent = input.nextLine();

         if (!newStudent.equals("")) {
            students.add(newStudent);
         }

      } while(!newStudent.equals(""));

      // Get student grades
      for (String student : students) {
         System.out.print("Grade for " + student + ": ");
         Double grade = input.nextDouble();
         grades.add(grade);
      }

      // Print class roster
      System.out.println("\nClass roster:");
      double sum = 0.0;

      for (int i = 0; i < students.size(); i++) {
         System.out.println(students.get(i) + " (" + grades.get(i) + ")");
         sum += grades.get(i);
      }

      double avg = sum / students.size();
      System.out.println("Average grade: " + avg);
   }
}

COPY

Save snippets that work from anywhere online with our extensions

Comments

JAVA control flow and collections

@cruz

3.1. Conditionals 3.2. Loops 3.4. ArrayList 3.4.1 do-while/for-each/for while array list ArrayList Methods Array 3.6. HashMap If-Then-Else-If Nested Conditional Statements Switch Statement Conditional-And: && Conditional-Or: || Logical NOT: ! A Simple Car Loan Payment Calculator Continents and Cities

#html #javascript #nodejs

How to Save HTML Form Data in JSON - Express

<form action="/new" method="post">
 
  <input name="title" type="text">
  <input name="description" type="text">
  <button type="submit">Submit Form</button>
 
</form>

> More steps

#javascript

Get URL and URL Parts in JavaScript

var newURL = window.location.protocol + "//" + window.location.host + "/" + window.location.pathname + window.location.search

#javascript

Add event listener to multiple buttons with the same class

    btns = document.getElementsByClassName("saveBtn");
    for (var i = 0; i < btns.length; i++) {
        btns[i].addEventListener("click", function () {
			//Add function here
        });
    }

#javascript

Replace Textarea with Codemirror editor

<link rel="stylesheet" type="text/css" href="plugin/codemirror/lib/codemirror.css">

<body>
	<textarea class="codemirror-textarea"></textarea>
</body>

<script>

$(document).ready(function(){
    var codeText = $(".codemirror-textarea")[0];
    var editor = CodeMirror.fromTextArea(codeText, {
        lineNumbers : true
    });
});

</script>

<script type="text/javascript" src="plugin/codemirror/lib/codemirror.js"></script>

#javascript #nodejs #commandline

HTTPS Redirect in Nodejs

npm install heroku-ssl-redirect

> More steps

#javascript #nodejs

Save to MongoDB without Duplicates Using Mongoose

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

const exampleSchema = new Schema({
    title: { type: String , required: true},
    content: [{type: String}]
});


var Example = mongoose.model('Example', exampleSchema);
module.exports = Example;

> More steps

#html #javascript #jsfunctions #dom #dommanipulation

getAttribute() - how to get the value of any attribute of HTML element

<html>

<input id="contact" name="address">

<script>

    var x = document.getElementById("contact").getAttribute('name');

</script>

</html>

#javascript

Full Stack Developer

function full_stack_developer() {
    full_stack_developer();
}

#javascript

3 Ways To Detect Selenium Bots Using Javascript - CodingTutz

if (navigator.webdriver) {
    document.body.innerHTML = "This is a Bot";
}

#javascript #promises #howto

How to Get the Domain From A URL Using Javascript

var url = "http://scratch99.com/web-development/javascript/";
var urlParts = url.replace('http://','').replace('https://','').split(/[/?#]/);
var domain = urlParts[0];

#javascript #javascript #functions #parameters

Required Parameters for Functions in JavaScript

 const isRequired = () => { throw new Error('param is required'); };

const hello = (name = isRequired()) => { console.log(`hello ${name}`) };

// These will throw errors
hello();
hello(undefined);

// These will not
hello(null);
hello('David');
The idea here is that it uses default parameters, like how the b parameter here has a default if you don’t send it anything:
function multiply(a, b = 1) {
  return a * b;
}

#javascript

Mapping an Object

const object1 = {
  a: 'somestring',
  b: 42
};

for (let [key, value] of Object.entries(object1)) {
  console.log(`${key}: ${value}`);
}

#javascript

Copy Text to Clipboard with Line Breaks

function copyToClipboard(){

    var codeToBeCopied = document.getElementById('code-snippet').innerText;
    var emptyArea = document.createElement('TEXTAREA');
    emptyArea.innerHTML = codeToBeCopied;
    const parentElement = document.getElementById('post-title');
    parentElement.appendChild(emptyArea);

    emptyArea.select();
    document.execCommand('copy');

    parentElement.removeChild(emptyArea);
    M.toast({html: 'Code copied to clipboard'})

    }

#javascript

How to store fetch response in javascript variable - Stack Overflow

async function fun() {
  return fetch('https://jsonplaceholder.typicode.com/todos/1').then(res => res.json());
}

const data  = await fun();

#javascript #jquery

jQuery.post() - AJAX for post requests

$.ajax({
  type: "POST",
  url: url,
  data: data,
  success: success,
  dataType: dataType
});

3.4. ArrayList

Save snippets that work from anywhere online with our extensions

Comments

More like this

JAVA control flow and collections

Browse more snippets >>

3.4. ArrayList

Save snippets that work from anywhere online with our extensions

Comments

More like this

JAVA control flow and collections

Browse more snippets >>

Embed code snippet