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

public class OnOffApplet extends Applet
    implements ActionListener {

    boolean isOn = false;
    Button onButton, offButton;

    public void init() {
	setLayout(new BorderLayout());
	onButton = new Button("On");
	offButton = new Button("Off");
	add(onButton, BorderLayout.WEST);
	add(offButton, BorderLayout.EAST);
	onButton.addActionListener(this);
	offButton.addActionListener(this);
    }

    public void paint (Graphics g) {
	if (isOn) {
	    setBackground(Color.yellow);
	} else {
	    setBackground(Color.black);
	}

    }

    public void actionPerformed(ActionEvent e) {
	if (e.getSource() == onButton)  { isOn = true; }
	if (e.getSource() == offButton) { isOn = false; }
	repaint();
    }

}