image3.java

这是《Java 2 简明教程(第2版)》一书配套的源代码。

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

public class Image3 extends Applet
{
  int index;
  Image img[]=new Image[5];
  
  public void init()
  {
    addMouseListener(new MouseAdapter(){
      public void mouseClicked(MouseEvent e){
        index=++index%5;
        repaint();
        }
      });
   for(int i=0;i<5;i++)
    img[i]=getImage(getCodeBase(),"smile.gif");
   }
  
   public void paint(Graphics g)
   {
     if(img[index]!=null)
       g.drawImage(img[index],60,20,this);
    }
}