jackhammerduke.java

几个基础的java Applet程序

import java.io.InputStream;
import java.awt.*;
import java.net.*;
//定义JackhammerDuke类
public class JackhammerDuke extends java.applet.Applet implements Runnable {
    int seqslot = 0;//当前循环的片断
    int nimgs = 4;//图片数量
    Image imgs;//Image对象
    String dir;//上载图片路径
    Thread kicker = null;//线程
    int pause;//停顿间隔
    double x;//当前位置
    int imgsWidth = 328;
    int imgsHeight = 90;
    //run()方法，负责循环播放图片，由线程调用
    public void run() {
	//设置线程优先权
	Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
       //获取图片
	imgs = getImage(getCodeBase(), "images/jack.gif");
       //如果有图片，开始循环播放
	if (imgs != null) {
	    x = (size().width - imgsWidth/nimgs) / 2;
	    while (size().width > 0 && size().height > 0 && kicker != null) {
		if (seqslot == 0) {
		    play(getCodeBase(), "audio/jackhammer-short.au");
		}
		repaint();
		try {Thread.sleep((seqslot == sequence.length -1) ? 500 : 100);} catch (InterruptedException e){}
		seqslot = (seqslot + 1) % sequence.length;
	    }
	}
    }
    //定义图片播放顺序
    private int sequence[] = { 2, 1, 0, 1, 0, 1, 0, 1, 2, 1, 0, 2, 0, 1, 0, 2, 3};
    //画当前帧
    boolean erase;
    //update()方法，调用paint()方法
    public void update(Graphics g) {
	if (erase || (sequence[seqslot] == 3)) {
	    g.setColor(Color.white);
	    g.fillRect(0, 0, size().width, size().height);
	    erase = false;
	}
	paint(g);
    }
    //paint()方法，负责在屏幕上绘制图像
    public void paint(Graphics g) {
	int loopslot = sequence[seqslot];
	if ((imgs != null) && (loopslot < nimgs)) {
	    int w = imgsWidth / nimgs;
	    x = Math.max(0, Math.min(size().width - w, x + Math.random() * 4 - 2));  
	    g.clipRect((int)x, 0, w, imgsHeight);
	    g.drawImage(imgs, (int)x - loopslot * w, 0, this);
	    erase = (loopslot == 3);
	}
    }
    //启动线程
    public void start() {
	if (kicker == null) {
	    kicker = new Thread(this);
	    kicker.start();
	}
    }
    //停止线程
    public void stop() {
	kicker = null;
    }
}