例12-9.txt

Java大学实用教程 耿祥义编著 课件 PPT

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Boy extends Applet implements ActionListener
{  
   final int number=8; 
   int count=0;
   Image[] card=new Image[number];
   Button next=new Button("next"),
   pevious=new Button("previous");
   public void init()
   {  
      next.addActionListener(this);
      pevious.addActionListener(this);
      add( pevious);
      add(next);
      for(int i=0;i<number;i++)
          {  
             card[i]=getImage(getCodeBase(),"tom"+i+".jpg");  
          }
   }
   public void paint(Graphics g)
   { 
     if((card[count])!=null)
        g.drawImage(card[count],120,60,100,100,this);
   }
   public void actionPerformed(ActionEvent e)
   {  
       if(e.getSource()==next)
        {
         count++;
         if(count>number-1)
           count=0;
        }
       else if(e.getSource()==pevious)
        {
         count--;
         if(count<0)
           count=number-1;
        }
       repaint();
   }
}