ballthread.java

BallThread为用java语言实现的弹球游戏演示!很简单明了!

import java.awt.*;

class Ball extends Thread        //小球线程类
{
	private Canvas box;
	                            //设置小球的大小
	private static final int XSIZE=10;
	private static final int YSIZE=10;
	private int x=0;
	private int y=0;
	private int dx=5;
	private int dy=2;
	
	public Ball(Canvas c)
	{
		box=c;
	}         
	public void draw()
	{
		Graphics g=box.getGraphics();
		//x y指小球的位置，XSIZE YSIZE指小球的大小
		g.fillOval(x,y,XSIZE,YSIZE);
		g.dispose();
	}
	public void move()
	{
		Graphics g=box.getGraphics();
		//取背景的互补色
		g.setXORMode(box.getBackground());
		g.fillOval(x,y,XSIZE,YSIZE);
		x+=dx;
		y+=dy;
		Dimension d=box.size();
		//判断小球是否到达边界
		if(x<0)
		{
			x=0;
			dx=-dx;
		}
		if(x+XSIZE>=d.width)
		{
			//x=d.width-XSIZE;
			dx=-dx;
		}
		if(y<0)
		{
			//y=0;
			dy=-dy;
		}
		if(y+YSIZE>=d.height)
		{
			//y=d.height-YSIZE;
			dy=-dy;
		}
		g.fillOval(x,y,XSIZE,YSIZE);
		g.dispose();
		
	}
	public void run()
	{
		draw();
		while(true)
		{
			move();
			try{Thread.sleep(4);}      //延迟5毫秒
			catch(InterruptedException e){}
			
		}
	}
}


public class BallThread extends Frame
{
	private Canvas canvas;
	public BallThread()
	{                  //设置按钮的位置及名称
	     setTitle("BallThread");
	     canvas=new Canvas();
		 add("Center",canvas);
		 Panel p=new Panel();
		 p.add(new Button("Start"));
		 p.add(new Button("Close"));
		 add("South",p);	 
	}
	public boolean handleEvent(Event evt) //接受事件句柄并处理
	{
		if(evt.id==Event.WINDOW_DESTROY)
		    System.exit(0);
		return super.handleEvent(evt);
	}
	public boolean action(Event evt,Object arg)
	{
		if(arg.equals("Start"))
		{
			Ball b=new Ball(canvas);   //创建Ball线程对象
			b.start();                 //激活线程
		}
		else if(arg.equals("Close"))
		          System.exit(0);
		else return super.action(evt,arg);
		return true;
	}
	public static void main(String[] args)
	{
		Frame f=new BallThread();
		f.resize(1100,700);
		f.show();
		f.repaint();
	}
}