animateapplet.java

java基础编程示例1

import java.awt.*;
import javax.swing.*;
import java.net.*;

public class AnimateApplet extends JApplet
{
    final int WIDTH=300;
    final int HEIGHT=200;
    final int NUMBER=18;    
    Image imgArray[] = new Image[NUMBER];
    Image currentImg = null;
    int nextIdx = 0;
    
    public void init()
    {
        URL myURL = null;
        try
        {
            for(int i=0; i<NUMBER; i++)
            {
                myURL = new URL(
                    "http://www.mywebsite.com/images/img000" 
                    + i + ".gif");
                imgArray[i] = getImage(myURL);
            }
        }
        catch(MalformedURLException murle)
        {
            System.out.println("ERROR: Invalid URL. " 
                + murle.getMessage());
        }
        
        MyThread myThread = new MyThread(this);
        myThread.start();
        setSize(WIDTH,HEIGHT);
    }
    
    public void paint(Graphics g)
    {
        g.setColor(getBackground());
        g.fillRect(0,0, WIDTH, HEIGHT);
        if(currentImg != null)
            g.drawImage(currentImg, 10, 10, this);
    }
    
    public void nextImage()
    {
        currentImg = imgArray[nextIdx];
        nextIdx = (++nextIdx) % NUMBER;
        repaint();
    }
}

class MyThread extends Thread
{
    private AnimateApplet parent;
    
    public MyThread(AnimateApplet p)
    {
        super();
        parent = p;
    }
    
    public void run()
    {
        try
        {
            while(true)
            {
                parent.nextImage();
                sleep(1000);
            }
        }
        catch(InterruptedException ie)
        {
            System.out.println(ie.toString());
        }
    }
}