求助！反弹球问题（模拟气泡屏保）

hniyani 2010-07-13 04:36:04

有个问题想请教大家我想写一个模拟的那种气泡屏保的程序我想实现单击鼠标就多一个球出来但是不知道为什么始终只能有一个球出现敬请大侠解惑代码如下：
package homeWork;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JApplet;

public class Ball extends JApplet implements Runnable {
private static final long serialVersionUID = 1L;

private Thread blueBall[]=new Thread[20];
private boolean xUp, yUp, bouncing;// 标记是否撞墙，小球是否开始运动
private int x, y, xDx, yDy;// x，y的增量
private final int MAX_X = 200, MAX_Y = 200;// applet的大小
private boolean direction[]= {true,false};//方向数组
private int count=0;//计数器

public void init() {
xUp = direction[(int)(Math.random()*2)];//初始方向随机
yUp = direction[(int)(Math.random()*2)];
xDx = 1;
yDy = 1;
bouncing = false;

addMouseListener(new MouseListener() {// 监听鼠标事件
public void mousePressed(MouseEvent event) {// 按下鼠标
// createBall(event);// 创建小球
}

public void mouseExited(MouseEvent event) {
}

public void mouseClicked(MouseEvent event) {
createBall(event);
count++;
}

public void mouseReleased(MouseEvent event) {
}

public void mouseEntered(MouseEvent event) {
}
});

setSize(MAX_X, MAX_Y);
}

private void createBall(MouseEvent event) {
if (blueBall[count] == null) {
x = event.getX();
y = event.getY();
blueBall[count] = new Thread(this);

bouncing = true;
blueBall[count].start();// 开始线程
}
}

public void stop() {
for (int i = 0; i <=count ; i++) {
blueBall[i] = null;
}

}

public void paint(Graphics g) {
super.paint(g);

if (bouncing) {
g.setColor(Color.blue);
g.fillOval(x, y, 10, 10);
}
}

public void run() {
while (true) {
try {
blueBall[count].sleep(20);// 等待其他准备工作
} catch (InterruptedException exception) {
// TODO: handle exception
System.err.println(exception.toString());
}

// 确定小球的方向
if (xUp == true)
x += xDx;
else
x -= xDx;

if (yUp == true)
y += yDy;
else
y -= yDy;

// 确定下一步
if (y <= 0) {
yUp = true;
yDy = (int) (Math.random() * 5 +1);//避免出现重复在两个位置对弹
} else if (y >= MAX_Y - 10) {
yDy = (int) (Math.random() * 5 +1);
yUp = false;
}

if (x <= 0) {
xUp = true;
xDx = (int) (Math.random() * 5 + 1);
} else if (x >= MAX_X - 10) {
xDx = (int) (Math.random() * 5 + 1);
xUp = false;
}

repaint();
}
}
}

好像，一单击，之前的线程就中断了。

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