贪吃蛇小程序

贪吃蛇小程序
自己已经运行过。没有问题！
第一个文件ShellMain.java
import javax.swing.JFrame;

public class ShellMain extends JFrame {
    public ShellWin win;
    public ShellMain()
    {
    this.win=new ShellWin();
    this.setTitle("贪吃蛇");
    this.setSize(800,800);
    this.setVisible(true);
    this.add(win);
    this.setLocation(200, 100);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
public static void main(String[] args) {
new ShellMain();
}

}
第二个文件ShellWin.java
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;
import java.io.IOException;
import java.text.BreakIterator;

import javax.crypto.spec.IvParameterSpec;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.text.html.CSS;

public class ShellWin extends JPanel implements ActionListener,Runnable,KeyListener{
    JButton startGame=new JButton("开始");
    JButton stopGame=new JButton("停止");
    int fang;
    int chang;
    int fen=0;
    int[] xs=new int[400];
    int[] ys=new int[400];
    int douX;int douY;
    Thread nThread;
    public ShellWin()
    {
    nThread=new Thread(this);
       this.add(startGame);this.add(stopGame);
       this.startGame.addActionListener(this);
       this.addKeyListener(this);
       造蛇();
       造豆();
    }
    public void paintComponent(Graphics g)
    {
    super.paintComponent(g);
    g.drawString("分数:"+fen, 50, 50);
    g.drawRect(100,100, 600, 600);
    显示蛇(g);
    显示豆(g);
    }
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==startGame)
{
this.requestFocus();
nThread.start();
   this.repaint();
}
}
//能不能吃豆，能不能死
void 死()
{
System.out.println("死了!");
}
void 吃()
{
chang++;
this.fen+=100;
造豆();
}
boolean 能出界死吗()
{
if(xs[0]==70||xs[0]==700||ys[0]==70||ys[0]==700)
{
return true;
}
return false;
}
void 转向(int 新方向)
{
  if(fang%2!=新方向%2)
  {
  fang=新方向;
  }
}
boolean 吃自己了吗()
{
for (int i = 1; i < chang; i++) {
if(xs[0]==xs[i]&&ys[0]==ys[i])
{
return true;
}
}
return false;
}
boolean 能吃豆吗()
{
if(xs[0]==douX&&ys[0]==douY)
{
return true;
}
return false;
}
void 造蛇()
{
fang=2;chang=5;
for (int i = 0; i < chang; i++) {
xs[i]=400;
ys[i]=400+30*i;
}
}
void 造豆()
{
   douX=30*(int)(Math.random()*19)+100;
   douY=30*(int)(Math.random()*19)+100;
   for (int i = 0; i < chang; i++) {
   if(xs[i]==douX&&ys[i]==douY)
   {
   造豆();
   return;
   }
   }
}
    void 显示豆(Graphics g)
    {
    g.setColor(Color.RED);
    g.fillOval(douX, douY, 30, 30);
    }
void 爬()
{
for (int i = chang-1; i >0; i--) {
xs[i]=xs[i-1];
ys[i]=ys[i-1];
}
switch (fang) {
case 1:
xs[0]=xs[0]+30;
break;
case 2:
ys[0]=ys[0]-30;
break;
        case 3:
        xs[0]=xs[0]-30;
break;
case 4:
ys[0]=ys[0]+30;
break;
default:
break;
}
}
void 显示蛇(Graphics g)
{
for (int i = 0; i < chang; i++) {
g.setColor(Color.BLUE);
g.drawRect(xs[i], ys[i], 30, 30);
}
}
@Override
public void run() {
while(true)
{
try {
if(能吃豆吗())
{
   吃();
}
if(能出界死吗())
{
死();
return;
}
if(吃自己了吗())
{
死();
return;
}
爬();
Thread.sleep(80);
repaint();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
void 转向()
{

}
@Override
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_UP:
转向(2);
break;
case KeyEvent.VK_DOWN:
转向(4);
break;
case KeyEvent.VK_LEFT:
转向(3);
break;
case KeyEvent.VK_RIGHT:
转向(1);
break;
default:
break;
}
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub

}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub

}
}