package Game;import  java.awt.*;import javax.swing.*;public class Ballgame extends JFrame {//框	Image ball = Toolkit.getDefaultToolkit().getImage("images/ball.png");	Image desk=Toolkit.getDefaultToolkit().getImage("images/desk.jpg");double degree=3.14/3;//弧度   double x=100;//小球的坐标   double y=100;	//画窗口的方法	public void paint(Graphics  g){		System.out.println("窗口被画了一次！");		g.drawImage(desk,0, 0,null);//先画桌面再画球		g.drawImage(ball, (int)x, (int)y, null);x=x+10*Math.cos(degree);y+=10*Math.sin(degree);if(y>=500-70||y<70){	degree=-degree;}//左右边界if(x<70||x>796){	degree=3.14-degree;}	}		//窗口加载	void launchFrame(){		setSize(856,500);		setLocation(400,400);		setVisible(true);		//重画窗口		while(true){			repaint();//调用paint			try {				Thread.sleep(80);			} catch (InterruptedException e) {				// TODO Auto-generated catch block				e.printStackTrace();			}		}	}		//main方法是程序执行的入口	public static void main(String[] args){		System.out.println(" 我是尚学堂高淇，这个游戏项目让大家体验编程的快感，寓教于乐！");		Ballgame game = new Ballgame();		game.launchFrame();	}	}