Java Simple GUI Snake Eating Games

This article example for everyone to share Java to achieve snake game specific code, for your reference, the specific content is as follows

Main startup class

import javax.swing.*;

/**
 * @author The Setting sun
 * @create 2021-09-11 15:19
 */
// Main startup class 
public class StartGame {
    public static void main(String[] args) {
        JFrame frame = new JFrame();

        frame.setResizable(false);// The window size is immutable 
        frame.setSize(900, 720);// Window size 
        frame.setLocationRelativeTo(null);// Center window 
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);// Window closing event 

        frame.add(new GamePanel());

        frame.setVisible(true);// Window visible 
    }
}

Resource class (icon)

import javax.swing.*;
import java.net.URL;

/**
@author The Setting sun
@create 2021-09-11 15:40
*/
public class Data {
    public static URL headerURL = Data.class.getResource("img/header.png");
    public static ImageIcon header = new ImageIcon(headerURL);

    public static URL upURL = Data.class.getResource("img/tx.png");
    public static ImageIcon up = new ImageIcon(upURL);

    public static URL downURL = Data.class.getResource("img/down.png");
    public static ImageIcon down = new ImageIcon(downURL);

    public static URL rightURL = Data.class.getResource("img/right.png");
    public static ImageIcon right = new ImageIcon(rightURL);

    public static URL leftURL = Data.class.getResource("img/left.png");
    public static ImageIcon left = new ImageIcon(leftURL);

    public static URL bodyURL = Data.class.getResource("img/body.png");
    public static ImageIcon body = new ImageIcon(bodyURL);

    public static URL foodURL = Data.class.getResource("img/food.png");
    public static ImageIcon food = new ImageIcon(foodURL);
}

Program class

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;

/**
 * @author The Setting sun
 * @create 2021-09-11 15:24
 */
//游戏面板
public class GamePanel extends JPanel implements KeyListener, ActionListener {
    //蛇
    int length;//蛇的长度
    int[] snakeX = new int[600];//蛇的x坐标 25*25
    int[] snakeY = new int[500];//蛇的y坐标 25*25
    String orient;//初始方向

    //食物
    int foodX;
    int foodY;
    Random random = new Random();

    boolean isStart = false;//游戏当前状态：默认为停止
    boolean isFail = false;//游戏是否失败了，默认为没有

    int score;//积分

    //定时器 ms为单位
    Timer timer = new Timer(140, this);//100毫秒刷新1次

    //构造器
    public GamePanel() {
        init();//初始化
        setFocusable(true);//获得焦点
        addKeyListener(this);//获得键盘监听事件
        timer.start();//游戏1开始定时器就启动
    }

    //初始化
    public void init() {
        length = 3;//初始长度为3

        snakeX[0] = 100;
        snakeY[0] = 100;//头的坐标

        snakeX[1] = 75;
        snakeY[1] = 100;//第1个身体的坐标

        snakeX[2] = 50;
        snakeY[2] = 100;//第2个身体的坐标

        orient = "R";//初始方向向右

        //让食物随机分布在界面上
        foodX = 25 + 25 * random.nextInt(34);
        foodY = 75 + 25 * random.nextInt(24);

        score = 0;//积分
    }


    //绘制面板，游戏中的东西都用这个来画
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏
        setBackground(Color.pink);

        //绘制静态面板
        Data.header.paintIcon(this, g, 25, 11);
        g.fillRect(25, 75, 850, 600);

        //绘制积分面板
        g.setColor(Color.GREEN);
        g.setFont(new Font("微软雅黑", Font.BOLD, 16));
        g.drawString("长度：" + length, 750, 35);
        g.drawString("积分：" + score, 750, 50);

        //绘制食物
        Data.food.paintIcon(this, g, foodX, foodY);

        //绘制蛇
        switch (orient) {
            case "R":
                Data.right.paintIcon(this, g, snakeX[0], snakeY[0]);//蛇初始化向右，通过判断转变方向
                break;
            case "L":
                Data.left.paintIcon(this, g, snakeX[0], snakeY[0]);//蛇初始化向右，通过判断转变方向
                break;
            case "U":
                Data.up.paintIcon(this, g, snakeX[0], snakeY[0]);//蛇初始化向右，通过判断转变方向
                break;
            case "D":
                Data.down.paintIcon(this, g, snakeX[0], snakeY[0]);//蛇初始化向右，通过判断转变方向
                break;
        }


        //动态添加身体
        for (int i = 1; i < length; i++) {
            Data.body.paintIcon(this, g, snakeX[i], snakeY[i]);
        }
//        Data.body.paintIcon(this,g,snakeX[1],snakeY[1]);//第1个身体的坐标
//        Data.body.paintIcon(this,g,snakeX[2],snakeY[2]);//第2个身体的坐标

        //游戏状态
        if (isStart == false) {
            g.setColor(Color.WHITE);
            g.setFont(new Font("微软雅黑", Font.BOLD, 40));
            g.drawString("按下空格开始游戏", 300, 300);
        }

        if (isFail) {
            g.setColor(Color.RED);
            g.setFont(new Font("微软雅黑", Font.BOLD, 40));
            g.drawString("犹豫就会败北！", 300, 300);
        }
    }

    //键盘监听器
    @Override
    public void keyPressed(KeyEvent e) {//按下
        int keyCode = e.getKeyCode();//获得键盘按键码

        if (keyCode == KeyEvent.VK_SPACE) {//按下空格
            if (isFail) {
                //重新开始
                isFail = false;
                init();
            } else {
                isStart = !isStart;//取反
                repaint();
            }
        }

        //修复了1个蛇可以反向移动的bug
        if (orient.equals("U") && keyCode == KeyEvent.VK_DOWN){
            keyCode = KeyEvent.VK_UP;
        }

        if (orient.equals("D") && keyCode == KeyEvent.VK_UP){
            keyCode = KeyEvent.VK_DOWN;
        }

        if (orient.equals("L") && keyCode == KeyEvent.VK_RIGHT){
            keyCode = KeyEvent.VK_LEFT;
        }

        if (orient.equals("R") && keyCode == KeyEvent.VK_LEFT){
            keyCode = KeyEvent.VK_RIGHT;
        }

        //控制蛇改变方向移动
        switch (keyCode) {
            case KeyEvent.VK_UP:

                orient = "U";
                break;
            case KeyEvent.VK_DOWN:
                orient = "D";
                break;
            case KeyEvent.VK_LEFT:
                orient = "L";
                break;
            case KeyEvent.VK_RIGHT:
                orient = "R";
                break;
        }


    }

    //事件监听：需要通过固定事件来刷新，1秒10次（帧率）
    @Override
    public void actionPerformed(ActionEvent e) {
        if (isStart && isFail == false) {//如果游戏是开始状态，就让蛇动起来
            //吃食物
            if (snakeX[0] == foodX && snakeY[0] == foodY) {
                //长度+1
                length++;
                score += 10;

                //再次让食物随机出现
                foodX = 25 + 25 * random.nextInt(34);
                foodY = 75 + 25 * random.nextInt(24);
            }

            //身体移动
            for (int i = length - 1; i > 0; i--) {
                snakeX[i] = snakeX[i - 1];
                snakeY[i] = snakeY[i - 1];
            }

            //走向
            switch (orient) {
                case "R":
                    snakeX[0] = snakeX[0] + 25;
                    //边界判断
                    if (snakeX[0] > 850) {
                        snakeX[0] = 25;
                    }
                    break;
                case "L":
                    snakeX[0] = snakeX[0] - 25;
                    //边界判断
                    if (snakeX[0] < 25) {
                        snakeX[0] = 850;
                    }
                    break;
                case "U":
                    snakeY[0] = snakeY[0] - 25;
                    //边界判断
                    if (snakeY[0] < 75) {
                        snakeY[0] = 650;
                    }
                    break;
                case "D":
                    snakeY[0] = snakeY[0] + 25;
                    //边界判断
                    if (snakeY[0] > 650) {
                        snakeY[0] = 75;
                    }
                    break;
            }

            //失败判断，撞到自己就GG
            for (int i = 1 ; i < length; i++) {
                if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){
                    isFail = true;
                }
            }

            repaint();//刷新页面
        }

        timer.start();//定时器开启
    }

    @Override
    public void keyTyped(KeyEvent e) {

    }

    @Override
    public void keyReleased(KeyEvent e) {

    }
}