java实现会反弹的小球示例

Java实现简单的球的弹射，碰到墙壁就反弹一下，代码如下

复制代码代码如下:

package tsct;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Image;

import java.awt.event.WindowStateListener;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.swing.JFrame;

public class Main extends JFrame implements Runnable

{

int x=40;

int y=30;

int width=50;

int height=50;

boolean xAdd=true;

boolean yAdd=true;

public void paint(Graphics g)

{

super.paint(g);

//g.fillRect(x, y, width, height);

g.setColor(Color.red);

g.fillOval(x, y, width, height);

}

int i=1;

@Override

public void run()

{

// TODO Auto-generated method stub

while(true)

{

if(yAdd)

y+=15;

else

y-=15;

if(y>=this.getHeight()-height||y<=25)

yAdd=!yAdd;

if(xAdd)

x+=30;

else

x-=30;

if(x>=this.getWidth()-width||x<=5)

xAdd=!xAdd;

repaint();

try

{

Thread.sleep(40);

i++;

}

catch (InterruptedException e)

{

e.printStackTrace();

}

}

}

public static void main(String[] args)

{

// Main main=new Main();

//

// main.setVisible(true);

// main.run();

Main main=new Main();

main.setVisible(true);

main.setBounds(50, 50, 800, 600);

Thread thread=new Thread(main);

thread.start();

try

{

Image image=ImageIO.read(new File(Main.class.getResource("").toString()));

}

catch (IOException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}