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

class TestPanel extends JPanel {

    public void paintComponent (Graphics g)
    {
	super.paintComponent (g);

	// Draw the string "Hello World!" at location (50,50)
	g.drawString ("Hello World!", 50, 50);
    }
}

class TestFrame extends JFrame implements WindowListener {

    public TestFrame ()
    {
	// Set the title, size and Window-closing event listener.
	setTitle ("Hello World Window");
	setSize (500, 300);
	addWindowListener (this);

	// Make a panel instance and put that in the frame.
	TestPanel p = new TestPanel ();
	getContentPane().add(BorderLayout.CENTER, p);

	// Make the frame visible.
	setVisible (true);
    }


    // Implementation of WindowListener interface:

    public void windowClosing(WindowEvent e) 
    {
	System.exit(0);
    }

    // Empty implementations of methods we don't need.
    public void windowOpened(WindowEvent e) {}
    public void windowClosed(WindowEvent e) {}
    public void windowIconified(WindowEvent e) {}
    public void windowDeiconified(WindowEvent e) {}
    public void windowActivated(WindowEvent e) {}
    public void windowDeactivated(WindowEvent e) {}

}

public class HelloWorldWindow extends JFrame {

    public static void main (String[] argv)
    {
	// Fire up the frame. 
	TestFrame f = new TestFrame ();
    }

}