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

public class MyApplet extends Applet implements MouseListener 
{ 
  public void init() 
  { 
    addMouseListener(this); 
  } 

  public void mouseReleased(MouseEvent ev) 
  { 
    setBackground(Color.blue); 
  } 

  public void mousePressed(MouseEvent ev) { } 
  public void mouseEntered(MouseEvent ev) { } 
  public void mouseExited(MouseEvent ev) { } 
  public void mouseClicked(MouseEvent ev) { } 
}