package com.myproj.snake;

 public class Node {

     private int i,j;

     public Node(){}

     public Node(int i, int j) {

         super();

         this.i = i;

         this.j = j;

     }

     public int getI() {

         return i;

     }

     public void setI(int i) {

         this.i = i;

     }

     public int getJ() {

         return j;

     }

     public void setJ(int j) {

         this.j = j;

     }

     @Override

     public int hashCode() {

         final int prime = 31;

         int result = 1;

         result = prime * result + i;

         result = prime * result + j;

         return result;

     }

     @Override

     public boolean equals(Object obj) {

         if (this == obj)

             return true;

         if (obj == null)

             return false;

         if (getClass() != obj.getClass())

             return false;

         Node other = (Node) obj;

         if (i != other.i)

             return false;

         if (j != other.j)

             return false;

         return true;

     }

 }

 package com.myproj.snake;

 import java.util.LinkedList;

 public class Snake {

     private LinkedList<Node> nodes=new LinkedList<Node>();

     public static final int UP=-5;

     public static final int DOWN=5;

     public static final int LEFT=-1;

     public static final int RIGHT=1;

     private int dir;//当前方向；

     public Snake(){

         nodes.add(new Node(3,9));

         nodes.add(new Node(4,9));

         nodes.add(new Node(5,9));

         nodes.add(new Node(5,10));

         nodes.add(new Node(5,11));

         nodes.add(new Node(6,11));

         nodes.add(new Node(7,11));

         this.dir=RIGHT;

     }

     public boolean contains(int i,int j){

         return nodes.contains(new Node(i,j));

     }

     public void move(){

         nodes.removeLast();

         Node head=nodes.getFirst();

         int i=head.getI()+dir/5;

         int j=head.getJ()+dir%5;

         nodes.addFirst(new Node(i,j));

     }

     public void move(int dir){

         if(this.dir+dir==0){

             System.out.println("不能逆向行驶！");

             System.out.println("游戏终止！");

             System.exit(0);

         }

         this.dir=dir;

         move();

     }

 }

 package com.myproj.snake;

 public class SnakePan {

     private Snake snake=new Snake();

     public Snake getSnake() {

         return snake;

     }

     public void setSnake(Snake snake) {

         this.snake = snake;

     }

     public void paint(){

         for(int i=0;i<=15;i++){

             for(int j=0;j<=40;j++){

                 if(i==0||i==15){

                     System.out.print("-");

                 }else if(j==0||j==40){

                     System.out.print("|");

                 }else if(snake.contains(i,j)){

                     System.out.print("■");

                 }else{

                     System.out.print(" ");

                 }

             }

             System.out.println();

         }

     }

 }

 package com.myproj.snake;

 import java.util.Scanner;

 public class SnakeTest {

     public static void main(String[] args){

         SnakePan snakePan=new SnakePan();

         Snake snake=snakePan.getSnake();

         snakePan.paint();

         /*for(int i=0;i<10;i++){

             snakePan.paint();

             snake.move();

             try {

                 Thread.sleep(1000);

             } catch (InterruptedException e) {

                 // TODO Auto-generated catch block

                 e.printStackTrace();

             }

         }*/

         Scanner scanner=new Scanner(System.in);

         System.out.println("请输入方向【上（U）、下（D）、左（L）、右（R）】：");

         while(true){

             String dir=scanner.nextLine();

             if(dir.equalsIgnoreCase("U")){

                 snake.move(snake.UP);

             }else if(dir.equalsIgnoreCase("D")){

                 snake.move(snake.DOWN);

             }else if(dir.equalsIgnoreCase("L")){

                 snake.move(snake.LEFT);

             }else if(dir.equalsIgnoreCase("R")){

                 snake.move(snake.RIGHT);

             }else{

                 System.exit(0);

             }

             snakePan.paint();

         }

     }

 }