java实现贪吃蛇小游戏（源码+注释）

大家好，又见面了，我是你们的朋友全栈君。

一.工程文件

在这里插入图片描述

二.Main.java

package com.company;

import javax.swing.*;

public class Main { 
   

    public static void main(String[] args) { 
   
        //创建窗体对象
        JFrame frame = new JFrame();
        //创建窗体参数（）
        frame.setBounds(10,10,900,720);
        //设置不允许更改大小
        //frame.setResizable(false);
        //设置关闭方式
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //添加主题逻辑框架
        frame.add(new Mpanel());
        //设置窗体可见
        frame.setVisible(true);
    }
}

三.Mpanel.java

package com.company;
import javax.imageio.ImageIO;
import javax.sound.sampled.*;
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.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Random;
//基本套路，继承JPanel，实现KeyListener, ActionListener接口
public class Mpanel extends JPanel implements KeyListener, ActionListener { 

//定义所需要的图片元素
//标题
ImageIcon title;
//蛇的身体部位
ImageIcon body;
//蛇向上方向的头
ImageIcon up;
//蛇向下方向的头
ImageIcon down;
//蛇向左方向的头
ImageIcon left;
//蛇向右方向的头
ImageIcon right;
//食物元素
ImageIcon food;
//定义初始长度
int len = 3;
//定义初始分数
int score = 0;
//存放蛇位置坐标的数组
int[] snakex = new int[750];
int[] snakey = new int[750];
//定义方向
String fx = "R";
//定义游戏是否开始
Boolean isStart = false;
//定义游戏是否失败
Boolean isFailed = false;
//定义游戏时钟，在此可以设置蛇移动速度，默认100ms
Timer timer = new Timer(100,this);
//定义食物的坐标
int foodx;
int foody;
//引入随机数，用于生成食物的随机位置
Random random = new Random();
//定义背景音乐
Clip bgm;
//构造方法
public Mpanel(){ 

//加载图片元素
loadImages();
//初始化数据
initSnake();
//设置聚焦
this.setFocusable(true);
//设置键盘监听
this.addKeyListener(this);
//开始计时
timer.start();
//加载背景音乐
loadBGM();
}
//设置绘图元素
public void paintComponent(Graphics g){ 

//调用父类方法
super.paintComponent(g);
//设置背景颜色为白色
this.setBackground(Color.white);
//设置标题元素位置
title.paintIcon(this,g,25,11);
//设置白色背景填充位置
g.fillRect(25,75,850,600);
//设置画笔颜色为白色
g.setColor(Color.white);
//设置长度显示
g.drawString("Len: " + len,750,35);
//设置分数显示
g.drawString("Score: " + score,750,50);
//根据方向调用相应的蛇头元素
if(fx == "R"){ 

right.paintIcon(this,g,snakex[0],snakey[0]);
}
else if(fx == "L"){ 

left.paintIcon(this,g,snakex[0],snakey[0]);
}
else if(fx == "U"){ 

up.paintIcon(this,g,snakex[0],snakey[0]);
}
else if(fx == "D"){ 

down.paintIcon(this,g,snakex[0],snakey[0]);
}
for(int i=1;i<len;i++){ 

body.paintIcon(this,g,snakex[i],snakey[i]);
}
//调用食物元素
food.paintIcon(this,g,foodx,foody);
//游戏开始的处理
if(isStart == false){ 

//设置画笔颜色
g.setColor(Color.white);
//设置字体
g.setFont(new Font("arial",Font.BOLD,40));
//设置具体文字
g.drawString("Press Space To Start",250,300);
}
//游戏失败的处理
if(isFailed){ 

//设置画笔颜色
g.setColor(Color.red);
//设置字体
g.setFont(new Font("arial",Font.BOLD,40));
//设置具体文字
g.drawString("Failed: Press Space To Start",250,300);
}
}
//初始化数据
public void initSnake(){ 

len = 3;
snakex[0] = 100;
snakey[0] = 100;
snakex[1] = 75;
snakey[1] = 100;
snakex[2] = 50;
snakey[2] = 100;
//设置食物的初始随机生成位置
foodx = 25 + 25 * random.nextInt(34);
foody = 75 + 25 * random.nextInt(24);
//设置初始值
fx = "R";
score = 0;
}
//接口要求的实现方法
@Override
public void keyTyped(KeyEvent e) { 

}
@Override
public void keyPressed(KeyEvent e) { 

//获取键盘监听
int keyCode = e.getKeyCode();
//空格
if(keyCode == KeyEvent.VK_SPACE){ 

//如果失败则重置信息
if(isFailed){ 

isFailed = !isFailed;
//重新开始
initSnake();
}
//设置开始
else { 

isStart = !isStart;
}
//判断开始后循环播放背景音乐
if(isStart){ 

bgm.loop(Clip.LOOP_CONTINUOUSLY);
}
//未开始和暂停则不播放背景音乐
else { 

bgm.stop();
}
//重新绘图
repaint();
}
//右键处理并设置不能回头
else if(keyCode == KeyEvent.VK_LEFT && fx != "R"){ 

fx = "L";
}
//左键
else if(keyCode == KeyEvent.VK_RIGHT && fx != "L"){ 

fx = "R";
}
//上键
else if(keyCode == KeyEvent.VK_UP && fx != "D"){ 

fx = "U";
}
//下键
else if(keyCode == KeyEvent.VK_DOWN && fx != "U"){ 

fx = "D";
}
}
//接口要求的实现方法
@Override
public void keyReleased(KeyEvent e) { 

}
//事件监听
@Override
public void actionPerformed(ActionEvent e) { 

//开始且没有失败的情况
if(isStart && !isFailed){ 

//循环移动蛇身
for(int i=len-1;i>0;i--){ 

snakex[i]=snakex[i-1];
snakey[i]=snakey[i-1];
}
//向右移动并判断是否撞墙，撞墙则失败
if(fx == "R"){ 

snakex[0]=snakex[0]+25;
if(snakex[0]>825)isFailed=true;
}
//向左移动并判断是否撞墙，撞墙则失败
else if(fx == "L"){ 

snakex[0]=snakex[0]-25;
if(snakex[0]<50)isFailed=true;
}
//向上移动并判断是否撞墙，撞墙则失败
else if(fx == "U"){ 

snakey[0]=snakey[0]-25;
if(snakey[0]<100)isFailed=true;
}
//向下移动并判断是否撞墙，撞墙则失败
else if(fx == "D"){ 

snakey[0]=snakey[0]+25;
if(snakey[0]>625)isFailed=true;
}
//吃到食物的判断
if(snakex[0]==foodx&&snakey[0]==foody){ 

//身体加长，分加多，并且随机生成新食物
len++;
score += 10;
foodx = 25 + 25 * random.nextInt(34);
foody = 75 + 25 * random.nextInt(24);
}
//撞到自身的处理
for(int i=1;i<len;i++){ 

if(snakex[i]==snakex[0] && snakey[i]==snakey[0]){ 

isFailed = true;
}
}
//重新绘图
repaint();
}
//事件刷新
timer.start();
}
//加载背景音乐
public void loadBGM(){ 

try { 

//从类所在文件引入
bgm = AudioSystem.getClip();
InputStream is = this.getClass().getClassLoader().getResourceAsStream("com/company/sound/bgm.wav");
AudioInputStream ais = AudioSystem.getAudioInputStream(new BufferedInputStream(is));
bgm.open(ais);
//bgm.loop(Clip.LOOP_CONTINUOUSLY);
}
//相应的异常处理
catch (LineUnavailableException e) { 

e.printStackTrace();
}
catch (UnsupportedAudioFileException e) { 

e.printStackTrace();
}
catch (IOException e) { 

e.printStackTrace();
}
}
//加载图片
public void loadImages(){ 

InputStream is;
try { 

//依次添加响应元素
is = getClass().getClassLoader().getResourceAsStream("com/company/img/title.jpg");
title = new ImageIcon(ImageIO.read(is));
is = getClass().getClassLoader().getResourceAsStream("com/company/img/body.png");
body = new ImageIcon(ImageIO.read(is));
is = getClass().getClassLoader().getResourceAsStream("com/company/img/up.png");
up = new ImageIcon(ImageIO.read(is));
is = getClass().getClassLoader().getResourceAsStream("com/company/img/down.png");
down = new ImageIcon(ImageIO.read(is));
is = getClass().getClassLoader().getResourceAsStream("com/company/img/left.png");
left = new ImageIcon(ImageIO.read(is));
is = getClass().getClassLoader().getResourceAsStream("com/company/img/right.png");
right = new ImageIcon(ImageIO.read(is));
is = getClass().getClassLoader().getResourceAsStream("com/company/img/food.png");
food = new ImageIcon(ImageIO.read(is));
} catch (IOException e) { 

e.printStackTrace();
}
}
}