FileChooserDemo.java

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

public class FileChooserDemo
{   private JFrame frame;
	private JFileChooser cc;
	private JButton b1, b2;
	private JTextArea ta;
     
	public FileChooserDemo()
	{
		frame = new JFrame("A Sample Frame");
		frame.setSize(700, 500);
		cc = new JFileChooser();
		ta = new JTextArea(20, 75);
 		frame.add(ta);
		
		b1 = new JButton("Open");
 		b1.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae)
			{   cc.showOpenDialog(frame);
			    File f = cc.getSelectedFile();
				String text ="";
				try(FileInputStream fis = new FileInputStream(f))
				{ int c = -1;
				  while((c=fis.read()) != -1)
					  text += (char)c;
				  ta.setText(text);
				}
				catch(Exception e){ e.printStackTrace();}
			}
		});
		frame.add(b1);	

		b2 = new JButton("Save");
 		b2.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae)
			{    cc.showSaveDialog(frame);
			     File f = cc.getSelectedFile();
				String filename = f.getName();
				String text = ta.getText();
				byte[] b = text.getBytes();
				try(
                        FileOutputStream fos = new FileOutputStream(filename)
                         )
				{  for(int i=0; i<text.length();i++)
					   fos.write(b[i]);
				}
				catch(Exception e){ e.printStackTrace();}
			}
		});
		frame.add(b2);		
	
		frame.setLayout(new FlowLayout());
           frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	     frame.setVisible(true);
	}
	
	public static void main(String[] args)
	{    	new FileChooserDemo();
	}
}

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

public class ColorChooserDemo
{   private JFrame frame;
	private JColorChooser cc;
	private JButton b;
     
	public ColorChooserDemo()
	{
		frame = new JFrame("A Sample Frame");
		frame.setSize(700, 500);
		
		cc = new JColorChooser(); frame.add(cc);
		
		b = new JButton("Color Changer");
		b.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae)
			{ frame.getContentPane().setBackground(cc.getColor()); }
		});
		frame.add(b);		
				
		frame.setLayout(new FlowLayout());
           frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    frame.setVisible(true);
	}
	
	public static void main(String[] args)
	{  	new ColorChooserDemo(); 	}
}
BorderLayoutDemo.java

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

public class BorderLayoutDemo
{   JFrame frame;
	public BorderLayoutDemo()
	{   frame = new JFrame("Border Layout Demo");
	     
		frame.setSize(800, 500);
		
		frame.setLayout(new BorderLayout());
		frame.add(new JButton("North"), BorderLayout.NORTH);
		JPanel panel = new JPanel();
		panel.add(new JButton("Button 1"));
		panel.add(new JButton("Button 2"));
		frame.add(panel, BorderLayout.SOUTH);
		
		frame.add(new JLabel("Border Layout West"), BorderLayout.WEST);
		frame.add(new JTextField(10), BorderLayout.EAST);
		frame.add(new JButton("CENTER"), BorderLayout.CENTER);
		
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
	
	public static void main(String[] args)
	{
		new BorderLayoutDemo();
	}
}

GridLayoutDemo.java

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

public class GridLayoutDemo
{   JFrame frame;
	public GridLayoutDemo()
	{   frame = new JFrame("Border Layout Demo");
	    frame.setSize(800, 500);
		
		frame.setLayout(new GridLayout(4, 4));
		
		JButton b1 = new JButton("1");frame.add(b1);
		JButton b2 = new JButton("2");frame.add(b2);
		JButton b3 = new JButton("3");frame.add(b3);
		JButton b4 = new JButton("Add");frame.add(b4);
		
		JButton b5 = new JButton("4");frame.add(b5);
		JButton b6 = new JButton("5");frame.add(b6);
		JButton b7 = new JButton("6");frame.add(b7);
		JButton b8 = new JButton("Subtract");frame.add(b8);
		
		JButton b9 = new JButton("7");frame.add(b9);
		JButton b10 = new JButton("8");frame.add(b10);
		JButton b11 = new JButton("9");frame.add(b11);
		JButton b12 = new JButton("Multiply");frame.add(b12);
		
		JButton b13 = new JButton("Dot");frame.add(b13);
		JButton b14 = new JButton("0");frame.add(b14);
		JButton b15 = new JButton("Percentage");frame.add(b15);
		JButton b16 = new JButton("Divide");frame.add(b16);
		
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
	
	public static void main(String[] args)
	{
		new GridLayoutDemo();
	}
}


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

public class CardLayoutDemo
{   JFrame frame;
	public CardLayoutDemo()
	{   frame = new JFrame("Border Layout Demo");
	    frame.setSize(800, 500);
		frame.setLayout(new FlowLayout());
		
		CardLayout clo = new CardLayout();
		JPanel p1 = new JPanel();p1.setBackground(Color.yellow);
		JPanel p2 = new JPanel();p2.setBackground(Color.yellow);
		JPanel p3 = new JPanel();p3.setBackground(Color.yellow);
		JPanel p4 = new JPanel();p4.setBackground(Color.yellow);
		
		JPanel main = new JPanel();
		main.setLayout(clo);
		p1.setBackground(Color.yellow);
		
		JButton b1 = new JButton("Open");	p1.add(b1);
		JButton b2 = new JButton("Save");	p1.add(b2);
		
		JButton b3 = new JButton("Exit");   	p2.add(b3);
		JButton b4 = new JButton("Dispose"); 	p2.add(b4);
		
		JCheckBox c1 = new JCheckBox("AWT"); p3.add(c1);
		JCheckBox c2 = new JCheckBox("Swing"); p3.add(c2);
		
		JCheckBox c3 = new JCheckBox("Java"); p4.add(c3);
		JCheckBox c4 = new JCheckBox("Python"); p4.add(c4);
		
		main.add(p1, "panel1"); main.add(p2, "panel2"); 
		main.add(p3, "panel3"); main.add(p4, "panel4");
		frame.add(main);
		
		JButton next = new JButton("Next");
		next.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae)
			{ clo.next(main);}
		});
		frame.add(next);
		
		JButton previous = new JButton("Previous");
		previous.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae)
			{ clo.previous(main);}
		});
		frame.add(previous); 
		
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
	
	public static void main(String[] args)
	{
		new CardLayoutDemo();
	}
}










SwingDemo.java

// Listener implemented as a separate class

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

public class SwingDemo
{   private JFrame frame;
	private JButton b1, b2;
     
	public SwingDemo()
	{    	frame = new JFrame("A Sample Frame");
		frame.setSize(700, 500);
		
		MyListener lis = new MyListener(frame);
		
		b1 = new JButton("Green");
		b1.addActionListener(lis); 	frame.add(b1);
				
		b2 = new JButton("Yellow");
		b2.addActionListener(lis); frame.add(b2);
		
		frame.setLayout(new FlowLayout());
        	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    	frame.setVisible(true);
	}
	
	public static void main(String[] args)
	{   new SwingDemo();
	}
	
}

class MyListener implements ActionListener
{   
    private JFrame fr;

    public MyListener(JFrame fr)
	{ this.fr = fr; }
	
	public void actionPerformed(ActionEvent ae)
	{    	String s = ae.getActionCommand();
		if(s.equals("Green"))
			fr.getContentPane().setBackground(Color.green);
		if(s.equals("Yellow"))
			fr.getContentPane().setBackground(Color.yellow);	
	}
}

SwingDemo2.java

// Listener implemented as an inner class

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

public class SwingDemo2
{   private JFrame frame;
	private JButton b1, b2;
     
	public SwingDemo2()
	{
		frame = new JFrame("A Sample Frame");
		frame.setSize(700, 500);
		
		MyListener lis = this.new MyListener();  
// note the use of this here
		
		b1 = new JButton("Green");
		b1.addActionListener(lis); frame.add(b1);
				
		b2 = new JButton("Yellow");
		b2.addActionListener(lis); frame.add(b2);
		
		frame.setLayout(new FlowLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    frame.setVisible(true);
	}
	
	public static void main(String[] args)
	{   new SwingDemo2();
	}

	class MyListener implements ActionListener
	{   		
		public void actionPerformed(ActionEvent ae)
		{   String s = ae.getActionCommand();
			if(s.equals("Green"))
				frame.getContentPane().setBackground(Color.green);
			if(s.equals("Yellow"))
				frame.getContentPane().setBackground(Color.yellow);	
		}
	}
}






SwingDemo3.java

// Listener implemented as anonymoys classes

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

public class SwingDemo3
{   private JFrame frame;
	private JButton b1, b2;
     
	public SwingDemo3()
	{
		frame = new JFrame("A Sample Frame");
		frame.setSize(700, 500);
				
		b1 = new JButton("Green");
		b1.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae)
			{	frame.getContentPane().setBackground(Color.green);
			}
		}); 
		frame.add(b1);
				
		b2 = new JButton("Yellow");
		b2.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent ae)
			{	frame.getContentPane().setBackground(Color.yellow);
			}
		});
		frame.add(b2);
		
		frame.setLayout(new FlowLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    frame.setVisible(true);
	}
	
	public static void main(String[] args)
	{   new SwingDemo3();
	}	 
}