src/Snake/Snake.java

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package Snake;

import java.awt.*;
import java.awt.event.*;

public class Snake {
	
	private Node head = null;
	private Node tail = null;
	private int size = 0;
	
	private Node n = new Node(20, 15, Direction.L);
	
	Yard yard;
	
	public Snake(Yard yard) {
		head = n;
		tail = n;//本代码来自www.51Aspx.com
		size = 1;
		this.yard = yard;
	}
	
	//双向链表
	private void addtoTail() {
		Node node = null;
		switch(tail.dir) {
		case L:
			node = new Node(tail.x + 1, tail.y, tail.dir);
			break;
		case U:
			node = new Node(tail.x, tail.y + 1, tail.dir);
			break;
		case R:
			node = new Node(tail.x - 1, tail.y, tail.dir);
			break;
		case D:
			node = new Node(tail.x, tail.y - 1, tail.dir);
			break;
		}
		
		tail.next = node;
		node.previous = tail;
		tail = node;
		size++;
	}
	
	private void addtoHead() {
		Node node = null;
		switch(head.dir) {
		case L:
			node = new Node(head.x - 1, head.y, head.dir);
			break;
		case U:
			node = new Node(head.x, head.y - 1, head.dir);
			break;
		case R:
			node = new Node(head.x + 1, head.y, head.dir);
			break;
		case D:
			node = new Node(head.x, head.y + 1, head.dir);