hdp.java

翻看图片的java小程序

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Hdp extends Applet implements ActionListener
{
int id=1;
Button b1=new Button("UP");
Button b2=new Button("NEXT");
Panel p1=new Panel();
Image image[]=new Image[4];
public void init()
{
setLayout(new BorderLayout());
add(p1,BorderLayout.EAST);
p1.add(b1);
p1.add(b2);
b1.addActionListener(this);
b2.addActionListener(this);
Toolkit kit=Toolkit.getDefaultToolkit();
for(int i=1;i<=3;i++)
image[i]=kit.getImage("pic"+i+".gif");}
public void paint(Graphics g)
{
if(id==4)
id=1;
if(id==0)
id=3;
g.drawImage(image[id],0,0,this);
}
public void actionPerformed(ActionEvent e)
{
if (e.getSource()==b1)
id--;
else
id--;
repaint();
}
}