根据遇见狂神说的视频编写的贪吃蛇小程序，在代码部分做了一些改变，添加了详细的注释，感兴趣的朋友们可以看看。
视频教程地址：一小时搞定Java贪吃蛇
下面是个人代码，源码包见地址：贪吃蛇源码
启动类
public class StartGame {
public static void main(String[] args) {
//1.绘制一个静态窗口 JFrame
// 设置标题
JFrame jf = new JFrame("xxx的贪吃蛇");
//设置界面大小
jf.setBounds(500,200,900,720);
//设置是否可以改变窗口大小
jf.setResizable(false);
//设置关闭事件
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//2.面板Jpanel 加入到Jframe
jf.add(new GamePanel());
//是否可见
jf.setVisible(true);
}
}
画板
package com.ye.snake;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;
public class GamePanel extends JPanel implements ActionListener, KeyListener {
/*
* 定义游戏变量
*/
// 定义蛇身长度
int length;
// 定义小蛇位置坐标
int[] snakeX = new int[500];
int[] snakeY = new int[500];
//定义食物坐标
int foodX;
int foodY;
Random random = new Random();
// 定义方向
String direction;
// 定义分数
int score;
// 游戏是否开始
boolean isStart;
// 游戏是否失败
boolean isFail;
// 定时器
Timer timer = new Timer(200,this);
// 定义初始化方法
public GamePanel() {
init();
/* 获取键盘监听事件，不能放在init()方法里面
不然每次重新开始游戏调用init()都会添加一个事件监听器，导致死亡之后按空格重新开始游戏后有两个事件监听
再按空格启动游戏时候isStart会被改变两次仍为false，无法启动游戏*/
this.setFocusable(true);
this.addKeyListener(this);
}
public void init() {
// 初始化长度
length = 3;
// 初始化分数
score = 0;
// 初始化蛇头
snakeX[0] = 100;snakeY[0] = 100;
// 初始化蛇身
snakeX[1] = 75;snakeY[1] = 100;
snakeX[2] = 50;snakeY[2] = 100;
// 初始化食物位置,注意不要超过画板边界
foodX = 25 + 25 * random.nextInt(34);
foodY = 25 + 25 * random.nextInt(26);
// 初始化方向
direction = "R";
// 游戏是否开始
isStart = false;
// 是否失败
isFail = false;
//启动定时任务
timer.start();
}
//游戏画板
@Override
protected void paintComponent(Graphics g) {
//清屏
super.paintComponent(g);
//设置背景色为白色
this.setBackground(Color.WHITE);
//设置游戏区域
g.fillRect(25,25,850,650);
// 分数和长度显示
g.setColor(Color.blue);
g.setFont(new Font("微软雅黑",1,30));
g.drawString("score：" + score,50,50);
g.drawString("length：" + length,50,80);
// 画蛇头
switch (direction) {
case "R":
Data.right.paintIcon(this,g,snakeX[0],snakeY[0]);
break;
case "L":
Data.left.paintIcon(this,g,snakeX[0],snakeY[0]);
break;
case "U":
Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);
break;
case "D":
Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);
break;
default:
break;
}
// 画蛇身
for (int i = 1;i < length;i++) {
Data.body.paintIcon(this,g,snakeX[i],snakeY[i]);
}
// 画食物
Data.food.paintIcon(this,g,foodX,foodY);
// 界面提示
if (!isStart && !isFail) {
g.setColor(Color.gray);
g.setFont(new Font("宋体",1,40));
g.drawString("按空格开始游戏/暂停",200,300);
}
// 失败提醒
if (isFail) {
g.setColor(Color.RED);
g.setFont(new Font("行书",1,30));
g.drawString("胜败乃兵家常事,大侠请重新来过!",200,300);
}
}
// 定时器
@Override
public void actionPerformed(ActionEvent e) {
if (isStart && isFail == false) {
//由于坐标由i从大往小变,该处不可从小往大遍历
for (int i = length -1;i > 0;i--) {
snakeX[i] = snakeX[i - 1];
snakeY[i] = snakeY[i - 1];
}
switch (direction) {
case "R" :
snakeX[0] += 25;
break;
case "L" :
snakeX[0] -= 25;
break;
case "U" :
snakeY[0] -= 25;
break;
case "D" :
snakeY[0] += 25;
break;
default:
break;
}
//边界判断
if (snakeX[0] > 850) {
snakeX[0] = 25;
}
if (snakeX[0] < 25){
snakeX[0] = 850;
}
if (snakeY[0] > 650) {
snakeY[0] = 25;
}
if (snakeY[0] < 25) {
snakeY[0] = 650;
}
// 吃到食物
if (snakeX[0] == foodX && snakeY[0] == foodY){
length++;
score += 100;
foodX = 25 + 25 * random.nextInt(34);
foodY = 25 + 25 * random.nextInt(26);
}
//失败判定
for (int i = 1;i < length;i++) {
if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]) {
isFail = true;
isStart = false;
}
}
//刷新界面
repaint();
}
timer.start();
}
@Override
public void keyTyped(KeyEvent e) {
}
// 监听键盘按下事件
@Override
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
// 改变方向
switch (keyCode) {
// 启动暂停游戏
case KeyEvent.VK_SPACE:
if (isFail) {
init();
}else {
isStart = !isStart;
}
repaint();
break;
//改变方向
case KeyEvent.VK_UP:
direction = !"D".equals(direction) ? "U" : "D";
break;
case KeyEvent.VK_DOWN:
direction = !"U".equals(direction) ? "D" : "U";
break;
case KeyEvent.VK_LEFT:
direction = !"R".equals(direction) ? "L" : "R";
break;
case KeyEvent.VK_RIGHT:
direction = !"L".equals(direction) ? "R" : "L";
break;
default:
break;
}
}
@Override
public void keyReleased(KeyEvent e) {
}
}
游戏资源（图片）
public class Data {
//获取图片位置
public static URL upUrl = Data.class.getResource("/picture/up.png");
public static URL downUrl = Data.class.getResource("/picture/down.png");
public static URL rightUrl = Data.class.getResource("/picture/right.png");
public static URL leftUrl = Data.class.getResource("/picture/left.png");
public static URL bodyUrl = Data.class.getResource("/picture/body.png");
public static URL foodUrl = Data.class.getResource("/picture/food.png");
//获取图片
public static ImageIcon up = new ImageIcon(upUrl);
public static ImageIcon down = new ImageIcon(downUrl);
public static ImageIcon right = new ImageIcon(rightUrl);
public static ImageIcon left = new ImageIcon(leftUrl);
public static ImageIcon body = new ImageIcon(bodyUrl);
public static ImageIcon food = new ImageIcon(foodUrl);
}