Java实现的简单的贪吃蛇，没用面向对象思想。后边有用面向对象实现的
package snack;import java.awt.Color;import java.awt.Graphics;import java.awt.Point;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.util.LinkedList;import java.util.Random;import javax.swing.JFrame;import javax.swing.JOptionPane;/** * 贪吃蛇 * * @author anduo * */public class Snack extends JFrame implements KeyListener, Runnable{/** * */private static final long serialVersionUID = 1L;private static final int WIDTH = 20;private static final int HEIGHT = 20;private static final int SIZE = 20;/** * UP和DOWN是偶数，RIGHT和LEFT是奇数 */private static final int UP = 2;private static final int DOWN = 4;private static final int LEFT = 1;private static final int RIGHT = 3;private int direction = 1;// 线程的休眠时间private int time = 300;// 一个linkedlist用于储存蛇节点private LinkedList<Point> snack = new LinkedList<Point>();// 食物节点private static Point food = new Point();Random rand = new Random();public Snack(){// 初始化蛇身int x = WIDTH / 2;int y = HEIGHT / 2;for (int i = 0; i < 3; i++){Point p = new Point();p.x = x++;p.y = y;snack.add(p);}// 初始化食物food.x = rand.nextInt(18) + 1;food.y = rand.nextInt(17) + 2;setTitle("贪吃蛇");this.addKeyListener(this);setDefaultCloseOperation(3);setBounds(getToolkit().getScreenSize().width / 2 - 150, getToolkit().getScreenSize().height / 2 - 150, 450, 460);this.repaint();setVisible(true);}/** * 重写print方法 */public void paint(Graphics g){// 绘制界面// g.fill3DRect(0, 0, this.getWidth(), this.getHeight(), true);g.setColor(Color.green);for (int i = 0; i < WIDTH; i++){// 绘制了400个方格，背景for (int j = 0; j < HEIGHT; j++){g.fill3DRect(i * SIZE + 20, j * SIZE + 40, SIZE, SIZE, true);}}// 绘制 蛇g.setColor(Color.red);for (Point p : snack){g.fillRect(p.x * SIZE, p.y * SIZE, SIZE, SIZE);}// 绘制食物g.setColor(Color.black);g.fill3DRect(food.x * SIZE, food.y * SIZE, SIZE, SIZE, true);}/** * 把蛇头跟蛇身的其他所有节点比较，如果相同，就死掉，否则不死 * * @return */public boolean isDead(){boolean dead = false;Point head = snack.getFirst();for (int i = 1; i < snack.size(); i++){if (head.equals(snack.get(i))){dead = true;}}return dead;}/** * 构造一个新的蛇 添加一个蛇头，然后删除蛇尾 * * @param direction */private void move(int direction){// if ((newDirection + this.direction) == 0)// {// }Point p = snack.getFirst();int x = p.x;int y = p.y;switch (direction){// 到达顶端时，从最下方出来；// 到达底端时，从最上方出来；// 到达左端时，从最右方出来；// 到达右端时，从最左方出来；case UP:y--;if (y == 1)y = 21;break;case DOWN:y++;if (y == 22)y = 2;break;case LEFT:x--;if (x == 0)x = 20;break;case RIGHT:x++;if (x == 21)x = 1;break;}if (this.isDead()){JOptionPane.showConfirmDialog(this, "GAME OVER!");System.exit(0);}// 如果蛇不出界，构造新蛇if (x < WIDTH + 1 && y < HEIGHT + 2 && x >= 1 && y >= 2){p = new Point(x, y);if (p.equals(food)){// 吃食物,然后把食物点加为头结点while (true){// 让食物不出现在蛇的身上food.x = rand.nextInt(18) + 1;food.y = rand.nextInt(17) + 2;if (!snack.contains(food))break;}snack.add(food);time -= 10;}snack.addFirst(p);snack.removeLast();this.repaint();}}/** * 改变蛇的行进方向 * * @param newDirection */public void changeDirection(int newDirection){if (this.direction % 2 != newDirection % 2)// 避免冲突{this.direction = newDirection;}}/** * 从键盘获取UP、DOWN、LEFT、RIGHT 调用move方法处理蛇的移动 */public void keyPressed(KeyEvent e){int code = e.getKeyCode();switch (code){case KeyEvent.VK_UP:this.changeDirection(UP);break;case KeyEvent.VK_DOWN:this.changeDirection(DOWN);break;case KeyEvent.VK_LEFT:this.changeDirection(LEFT);break;case KeyEvent.VK_RIGHT:this.changeDirection(RIGHT);break;}}/** * 线程方法，用一个while循环线程时间，让蛇可以按指定方向自动行走 */public void run(){while (true){try{Thread.sleep(time);this.move(this.direction);}catch (InterruptedException e){e.printStackTrace();}}}public static void main(String[] args){new Thread(new Snack()).start();}public void keyTyped(KeyEvent e){}public void keyReleased(KeyEvent e){}}