经典游戏贪吃蛇 Java实现源代码

import javax.swing.*;
import java.awt.*;
import java.util.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class SnakeFrame extends JFrame implements KeyListener{
   public JPanel gamePanel;//游戏面板
   public Vector<Node>allNode=new Vector<Node>();  // 所有结点
   class Node{
    int x;
    int y;
    int nextDir;
    public Node(int x,int y,int d)
    {
     this.x=x;
     this.y=y;
     this.nextDir=d;
    }
   };
   public static final int S_UP=1;
   public static final int S_DOWN=2;
   public static final int S_LEFT=3;
   public static final int S_RIGHT=4;
   public static final int S_STOP=-1;
   //头节点
   public  Node head=new Node(80,80,SnakeFrame.S_LEFT);
   public  Node eatNode;
   public Random rand=new Random();
   public SnakeFrame()
   {   
    this.setBounds(0, 0, 200, 400);
    this.setTitle("贪吃蛇");
    this.setClosed();
    gamePanel=new JPanel();
       gamePanel.setSize(200, 400);
       gamePanel.setVisible(true);
       this.getContentPane().add(gamePanel);
    
    this.addKeyListener(this);
   }
   //实现关闭的处理
  public void setClosed()
  {
   WindowAdapter wa=new WindowAdapter()
    {
     public void windowClosing(WindowEvent e) {
      System.exit(0);
     }
    };
   this.addWindowListener(wa);
  }
   public void paintGame()
   {   Graphics g=this.gamePanel.getGraphics();
    g.setColor(new Color(255,255,255));
       g.fillRect(0, 0, this.getWidth(), this.getHeight());
       //绘制头
       g.setColor(new Color(255,0,0));
    g.fillRect(head.x, head.y, 20, 20);
    //绘制身体
    g.setColor(new Color(220,220,220));
    Iterator<Node> it=this.allNode.iterator();
    while(it.hasNext())//如果还有下一个
    {Node nownode=it.next();//获取下一个节点
     g.fillRect(nownode.x, nownode.y, 20, 20);
    }
    //绘制可以吃的小块
    g.setColor(new Color(0,0,255));
    g.fillRect(eatNode.x, eatNode.y, 20, 20);
    //
    g.drawString("fenshu:30", 30, 30);
    
   }
   public void startGame()
   {   int x=rand.nextInt(10);
       int y=rand.nextInt(20);
    this.eatNode=new Node(x*20,y*20,SnakeFrame.S_STOP);
    Thread t=new Thread()
    {
   public void run()
   {
    while(true)
    {   paintGame();//绘制游戏
     move(head);//移动头
     //移动所有身体块
     moveAllNode();
     ///
      if(checkEat(head)){
       Node endNode;
       if(allNode.size()==0)
       {endNode=head;}
       else{
        endNode=allNode.lastElement();
       } 
      switch(endNode.nextDir)
      {case SnakeFrame.S_DOWN:
        allNode.add(new Node(endNode.x,endNode.y-20,SnakeFrame.S_DOWN));
        break;
       case SnakeFrame.S_UP:
       allNode.add(new Node(endNode.x,endNode.y+20,SnakeFrame.S_UP));
         break;
       case SnakeFrame.S_LEFT:
        allNode.add(new Node(endNode.x+20,endNode.y,SnakeFrame.S_LEFT));
         break;
       case SnakeFrame.S_RIGHT:
        allNode.add(new Node(endNode.x-20,endNode.y,SnakeFrame.S_RIGHT));
         break;
      }
      } 
     try{Thread.sleep(300);}catch(Exception e){}
    }
   }
    };
    t.start();
   }
   public void moveAllNode()
   {
    Iterator<Node> node=allNode.iterator();
  int dir=head.nextDir;
     int tmp; 
  while(node.hasNext())
   {Node nownode=node.next();
    switch(nownode.nextDir)
    {case SnakeFrame.S_DOWN:nownode.y+=20;break;
     case SnakeFrame.S_UP:nownode.y-=20;break;
     case SnakeFrame.S_LEFT:nownode.x-=20;break;
     case SnakeFrame.S_RIGHT:nownode.x+=20;break;
    }
    tmp=nownode.nextDir;
    nownode.nextDir=dir;
    dir=tmp;
   }
   }
   public void move(Node node)//移动某一个块 
   {
   
  switch(node.nextDir)
  {case SnakeFrame.S_DOWN:
    node.y+=20;
    break;
  case SnakeFrame.S_UP:
    node.y-=20; 
    break;
  case SnakeFrame.S_LEFT:
    node.x-=20;
    break;
  case SnakeFrame.S_RIGHT:
   node.x+=20;
    break;
  }
  
   }
   
   public boolean  checkEat(Node node)
   {
    if((node.x==eatNode.x)&&(node.y==eatNode.y))
    {
    System.out.println("okeat");
    int x=rand.nextInt(10);
       int y=rand.nextInt(20);
    this.eatNode=new Node(x*20,y*20,SnakeFrame.S_STOP);//这里其实可以不用new
    return true;
    }
    return false;
   }
   
   public void keyPressed(KeyEvent e) {
 System.out.println(e.getKeyCode());
 if(e.getKeyCode()==37&&head.nextDir!=SnakeFrame.S_LEFT){
  head.nextDir=SnakeFrame.S_LEFT;
    }
 if(e.getKeyCode()==38&&head.nextDir!=SnakeFrame.S_UP){
  head.nextDir=SnakeFrame.S_UP;}
 if(e.getKeyCode()==39&&head.nextDir!=SnakeFrame.S_RIGHT){
  head.nextDir=SnakeFrame.S_RIGHT;}
 if(e.getKeyCode()==40&&head.nextDir!=SnakeFrame.S_DOWN){
  head.nextDir=SnakeFrame.S_DOWN;}
 
   }
 public void keyReleased(KeyEvent e) {
 
 }
 public void keyTyped(KeyEvent e) {
 
}
}

public class Snake {
 public static void main(String dd[])
 {
  SnakeFrame sf=new SnakeFrame();
  sf.setVisible(true);
  sf.startGame();
 }
}