java applet example of changing background color on button click event

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class ColorApplet extends Applet implements ActionListener
{
 Button b1,b2,b3;

 public void init()
 {
  b1 = new Button("Red");
  b2 = new Button("Green");
  b3 = new Button("Blue");
 
  add(b1);add(b2);add(b3);
   
  b1.addActionListener(this);
  b2.addActionListener(this);
  b3.addActionListener(this);
  setBackground(Color.yellow);
 }

 public void actionPerformed(ActionEvent ae)
 {
  if(ae.getSource()==b1)
   setBackground(Color.red);
  if(ae.getSource()==b2)
   setBackground(Color.green);
  if(ae.getSource()==b3)
   setBackground(Color.blue);
 }
}


/*<applet code=ColorApplet height=300 width=300></applet>*/