HelloWorldGUI2.java

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

public class HelloWorldGUI2 
{
     private static class HelloWorldDisplay extends JPanel 
     {
     	public void paintComponent(Graphics g)
        {
       		super.paintComponent(g);
         	g.drawString( "Hello World!", 20, 30 );
        }
     }
   
      private static class ButtonHandler implements ActionListener
      {
         public void actionPerformed(ActionEvent e) 
         {
         	System.exit(0);
         }
      }
   
     public static void main(String[] args)
     {
      	HelloWorldDisplay displayPanel = new HelloWorldDisplay();
      	JButton okButton = new JButton("OK");
      	ButtonHandler listener = new ButtonHandler();
      	okButton.addActionListener(listener);

      	JPanel content = new JPanel();
      	content.setLayout(new BorderLayout());
      	content.add(displayPanel, BorderLayout.CENTER);
      	content.add(okButton, BorderLayout.SOUTH);

      	JFrame window = new JFrame("GUI Test");
      	window.setContentPane(content);
      	window.setSize(250,100);
      	window.setLocation(100,100);
      	window.setVisible(true);

     }
   
}