例13-9.txt

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import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Example13_9 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();
    }
}