JFrame examples in java

import java.awt.*;
import java.awt.event.*;


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

      Button b;
      ActionListener a = new MyActionListener();
      Frame f = new Frame("Java Frame");
     
      f.add(b = new Button("Java"), BorderLayout.NORTH);
      b.setActionCommand("Java");
      b.addActionListener(a);
     
      f.add(b = new Button("VB"), BorderLayout.CENTER);
      b.setActionCommand("VB");
      b.addActionListener(a);
     
      f.add(b = new Button(".Net"), BorderLayout.EAST);
      b.setActionCommand(".Net");
      b.addActionListener(a);
     
      f.add(b = new Button("Software"), BorderLayout.WEST);
      b.setActionCommand("Software");
      b.addActionListener(a);
     
      f.add(b = new Button("Exit"), BorderLayout.SOUTH);
      b.setActionCommand("Exit");
      b.addActionListener(a);
     
      //f.pack();
      f.setSize(300,200);
     
      f.setVisible(true);
    }         
  }

  class MyActionListener implements ActionListener {
    public void actionPerformed(ActionEvent ae) {
      String s = ae.getActionCommand();
      if (s.equals("Exit")) {
        System.exit(0);
        }
        else if (s.equals("Java")) {
          System.out.println("Java rocks.");
          }
          else if (s.equals("VB")) {
          System.out.println("VB is old.");
          }
          else if (s.equals(".Net")) {
          System.out.println(".Net is ok.");
          }
           else {
            System.out.println(s + " clicked");
            }
      }
}

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