import java.awt.*;public class Rebound{ public static void main(String args[]) { Frame w=new Frame(); w.setSize(800, 800); MyRebound p=new MyRebound(); w.add(p); My b=new My(); w.add(b); Thread t1=new Thread(p); Thread t2=new Thread(b); t1.start(); t2.start(); w.show(); }}class MyRebound extends Panel implements Runnable{ int x=(int)(Math.random()*800); int y=(int)(Math.random()*800); int att=0; public void paint(Graphics g) { g.fillOval(x, y, 50, 50); } public void run(){ while(true) { //定义飞行姿态 if(att==0) { x++; y++; } if(att==1) { x--; y++; } if(att==2) { x--; y--; } if(att==3) { x++; y--; } //改变飞行姿态 if(x>730) { if (att==0) { att=1; }else { att=2; } } if(y>700) { if(att==1) { att=2; }else { att=3; } } if(x<0) { if(att==2) { att=3; }else { att=0; } } if(y<0) { if(att==3) { att=0; }else { att=1; } } try { Thread.sleep(5); //线程休眠5毫秒 }catch(Exception e) {} //异常处理 repaint(); } }}//.........................................................................................class My extends Panel implements Runnable{ int i=(int)(Math.random()*800); int j=(int)(Math.random()*800); int att=0; public void paint(Graphics g) { g.setColor(Color.yellow); g.drawOval(i ,j, 50, 50); } public void run(){ while(true) { //定义飞行姿态 if(att==0) { i++; j++; } if(att==1) { i--; j++; } if(att==2) { i--; j--; } if(att==3) { i++; j--; } //改变飞行姿态 if(i>730) { if (att==0) { att=1; }else { att=2; }} if(j>700) { if(att==1) { att=2; }else { att=3; } } if(i<0) { if(att==2) { att=3; }else { att=0; } } if(j<0) { if(att==3) { att=0; }else { att=1; } } try { Thread.sleep(5); //线程休眠5毫秒 }catch(Exception e) {} //异常处理 repaint(); } } }
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