// GUI_w2
// <applet code=GUI_w2.class height=400 width=500> </applet>

import java.applet.Applet;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public class GUI_w2 extends Applet 
	implements WindowListener, ActionListener 
{
TextArea display;
Frame window;
Button b1, b2;

static final String SHOW = "show";
static final String CLEAR = "clear";
String newline;
public void init() 
	{
	b1 = new Button("Click to bring up a window.");
	b1.setActionCommand(SHOW);
	b1.addActionListener(this);
	b2 = new Button("Click to clear the display.");
	b2.setActionCommand(CLEAR);
	b2.addActionListener(this);
	display = new TextArea(5, 20);
	display.setEditable(false);
	setLayout(new BorderLayout());
	add("North", b1);
	add("Center", display);
	add("South", b2);
	//Create but don't show window.
	window = new Frame("Window Event Window");
	window.addWindowListener(this);
	window.add("Center", new Label("The applet listens to this window for window events."));
	window.pack();
	newline = System.getProperty("line.separator");
	}
public void stop() 
	{
	window.setVisible(false);
	}
public void windowClosing(WindowEvent e) 
	{
    	window.setVisible(false);
	displayMessage("Window closing", e);
	}

public void windowClosed(WindowEvent e) 
	{
	displayMessage("Window closed", e);
	}
public void windowOpened(WindowEvent e) 
	{
	displayMessage("Window opened", e);
	}
public void windowIconified(WindowEvent e) 
	{
	displayMessage("Window iconified", e);
	}
public void windowDeiconified(WindowEvent e) 
	{
	displayMessage("Window deiconified", e);
	}
public void windowActivated(WindowEvent e) 
	{
	displayMessage("Window activated", e);
	}
public void windowDeactivated(WindowEvent e) 
	{
	displayMessage("Window deactivated", e);
	}
void displayMessage(String prefix, WindowEvent e) 
	{
	display.append(prefix + ": " + e.getWindow() + newline); 
	}
public void actionPerformed(ActionEvent e) 
	{
	if (e.getActionCommand() == SHOW) 
		{
		window.pack();
		window.setVisible(true);
		} 
	else 
		{
		display.setText("");
		}
	}
}