java小程序（小球碰壁）

模拟一个小球碰壁后，沿光的反射方向运动的动画。

package mypro01;import java.awt.*;class Main{public static void main(String[]args){   Frame f=new Frame();    f.setSize(1010,710);    MyPanel m=new MyPanel();    Thread t=new Thread(m);    t.start();    f.add(m);   f.show();}}class MyPanel extends Panel implements Runnable{int y=0;int x=0;public void paint(Graphics g){g.fillOval(x,y,40,40);}public void run(){boolean up=false;boolean right=true;             while(true){if(y>700||y<0){if(up)up=false;elseup=true;}if(x<0||x>1000){if(right)right=false;elseright=true;}if(right)    x++;elsex--;if(up)y--;elsey++;try{Thread.sleep(10);}catch(Exception e){}repaint();}}}