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 1¡£Ê×Ïȶ¨Òå´°¿Ú200X400 £¬ÊµÏÖ¿ØÖÆ1¸ö¾ØÐη½¿é20X20
 2¡£Í¨¹ý°´¼ü¿ØÖÆ·½¿éÒÆ¶¯
 3¡£ÊµÏÖÏ߳̿ØÖÆ·½¿éÒÆ¶¯Ã¿´ÎÒ»¸ñ(20X20),ͨ¹ý°´¼ü¸Ä±ä·½Ïò
 4.ʵÏÖÔÚ´°¿ÚÖÐËæ»ú³öÏÖ¿ÉÒÔ³ÔµÄС¿é ×÷ΪҪÊÇ20µÄ±¶Êý
 5.ʵÏÖ·½¿éºÍ¿ÉÒÔ³ÔµÄС¿éÅöײ
 6.½«ÉßµÄÉíÌåÿһ¿é¶¨ÒåΪVector£¬ÓÐÿ¿é¶ÔÓ¦Ò»¸ö¶ÔÏó
   Node{
     int x;
     int y;
     int nextDir£»
   }
 7¡£ÊµÏÖËÀÍöÅж¨ºÍ·ÖÊýÅж¨
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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;//ÓÎÏ·Ãæ°å
   public Vector<Node>allNode=new Vector<Node>();  // ËùÓнáµã
   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;
   //Í·½Úµã
   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("̰ʳÉß");
    this.setClosed(


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