Java 写的低级落雨游戏

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;

public class Myjava extends JFrame implements Runnable,KeyListener{
	JPanel panel;
	long start,finish;
	JLabel me;
	int che = 1;
	
	public Myjava(int width,int height){
		panel = new JPanel();
		panel.setLayout(null);
		panel.setBackground(Color.yellow);
		
		me = new JLabel();
		me.setBackground(Color.blue);
		me.setOpaque(true);
		me.setSize(10,10);
		me.setLocation(width/2,height-100);
		
		add(me);
		
		add(panel);
		addKeyListener(this);
		
		setSize(width,height);
		paintFrame();
		start = System.currentTimeMillis();
		
	}
	
	public void paintFrame(){
		setTitle("有一定几率跑过火");
		
		Dimension screenSize = getToolkit().getDefaultToolkit().getScreenSize();
		setLocation(screenSize.width/2-getWidth()/2,screenSize.height/2-getHeight()/2);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true);
		
	}
	
	public void element(){
		int i =0;
		int time = 0;
		
		Random r = new Random();
		int wei = r.nextInt(getWidth());
		
		while(time<100)
		time = r.nextInt(500);
		
		JLabel label = new JLabel("火");
		label.setSize(15,20);
	//	label.setOpaque(true);
		label.setBackground(Color.yellow);
	//	label.setForeground(Color.red);
		
		panel.add(label);
		
	
		label.setLocation(wei,0);		
		
		while(true){
			try{
				Thread.sleep(time);
			}catch(InterruptedException e){System.out.println(e.getMessage());}
			i+=10;
			label.setLocation(wei,i);
			if(i>this.getHeight()){label.setLocation(wei=r.nextInt(getWidth()),0);i=0;}
			
			pzh(label.getLocation());
			if(time>20)time-=1;
			if(che==0)break;					
		
		}
	}
	
	public void run(){
		element();
	}
	
	public void pzh(Point pl){
		Point pm = me.getLocation();
		if(Math.abs(pl.y-pm.y)<10&&Math.abs(pl.x-pm.x)<10){
			finish = System.currentTimeMillis();
			int n=JOptionPane.showConfirmDialog(null,"得分:"+(finish-start)/100+"再来一次","你挂了",JOptionPane.YES_NO_OPTION);
			if(n==JOptionPane.YES_OPTION){
				che = 0;
				dispose();
				start();
			}
			else System.exit(0);
		}
	}
	
	public void keyPressed(KeyEvent e){
		int step = 10;
		Point pm = me.getLocation();
		switch(e.getKeyCode()){
			case KeyEvent.VK_LEFT:me.setLocation(pm.x-step,pm.y);break;
			case KeyEvent.VK_RIGHT:me.setLocation(pm.x+step,pm.y);break;
			case KeyEvent.VK_UP:me.setLocation(pm.x,pm.y-step);break;
			case KeyEvent.VK_DOWN:me.setLocation(pm.x,pm.y+step);break;
		}

		
	}
	public void keyReleased(KeyEvent e){
	}
	public void keyTyped(KeyEvent e){
	}
	
	public static void start(){
		
		Myjava my = new Myjava(400,400);
		for(int i=0;i<8;i++)
		new Thread(my).start();
	}
	public static void main(String[] args){
		
		start();
	}
}