java贪食蛇小游戏，趣味性强，附源码加注释

package 贪食蛇; //画蛇 //让蛇移动move(); //吃蛋 //让蛇不能够往回走 //判断蛇的生死,撞墙或者撞到自身则游戏停止 //游戏停止的时候显示game over! import java.awt.*; import java.awt.event.KeyEvent; public class Snake { Node head = null;//蛇头 Node tail = null;//蛇尾 int number = 0;//节点数 private Node n = new Node(18, 18, Direction.l);//初始化节点 private Yard y; public Snake(Yard y) {//蛇头蛇尾为同一个节点n this.head = n; this.tail = n; this.number = 1; this.y = y; } public void addToTail() { Node node = null; switch (tail.dir) { case u: node = new Node(tail.row + 1, tail.col, tail.dir); break; case d: node = new Node(tail.row - 1, tail.col, tail.dir); break; case l: node = new Node(tail.row, tail.col + 1, tail.dir); break; case r: node = new Node(tail.row, tail.col - 1, tail.dir); break; } tail.next = node;//加在蛇尾 node.previous = tail; tail = node; number++;//蛇的节点数增加 } public void addToHead() { Node node = null; switch (head.dir) { case l: node = new Node(head.row, head.col - 1, head.dir); break; case u: node = new Node(head.row - 1, head.col, head.dir); break; case r: node = new Node(head.row, head.col + 1, head.dir); break; case d: node = new Node(head.row + 1, head.col, head.dir); break; } node.next = head; head.previous = node; head = node; number++; } public void draw(Graphics g) { if (number <= 0) { return; } for (Node n = head; n != null; n = n.next) { n.draw(g); } //画蛇的时候调用move() move(); checkDead(); } private void checkDead() { if (head.row <= 0 || head.col < 0 || head.row >= Yard.rows || head.col >= Yard.cols) { y.stop(); } for (Node n = head.next; n != null; n = n.next) { if (head.row == n.row && head.col == n.col) { y.stop(); } } } private void move() { addToHead(); deleteTail(); } private void deleteTail() { if (number == 0) { return; } tail = tail.previous; tail.next = null; } //画节点,内部类 public class Node { int w = Yard.block; int h = Yard.block; int row, col;//节点所在的行和列 Direction dir = Direction.l; Node next = null;//下一个节点 Node previous = null; public Node(int row, int col, Direction dir) { this.row = row; this.col = col; this.dir = dir; } void draw(Graphics g) { Color c = g.getColor(); g.setColor(Color.black); g.fillRect(col * Yard.block, row * Yard.block, w, h); g.setColor(c); } } //添加键盘按下的响应事件 public void keyPressed(KeyEvent e) { int key = e.getKeyCode(); switch (key) { case KeyEvent.VK_UP: if (head.dir != Direction.d) { head.dir = Direction.u; } break; case KeyEvent.VK_DOWN: if (head.dir != Direction.u) { head.dir = Direction.d; } break; case KeyEvent.VK_LEFT: if (head.dir != Direction.r) { head.dir = Direction.l; } break; case KeyEvent.VK_RIGHT: if (head.dir != Direction.l) { head.dir = Direction.r; } break; } } public Rectangle getRect() { return new Rectangle(head.col * Yard.block, head.row * Yard.block, head.w, head.h); } public void eat(Egg e) { if (this.getRect().intersects(e.getRect())) { e.reAppear(); addToHead(); y.setScore(y.getScore() + 5); } } }