Use java to implement a simple snake game

GUI programming to implement the Snake game

(Recommended tutorial: java course)

1. Write the main method Implement startup class

2. Prepare material pictures and write data classes

3. Main part of the code: implement game initialization, keyboard and event monitoring and other functions on the panel

4. Code running renderings

5. GitHub source code link

1. Write the main method to implement the startup class

		import javax.swing.*;
        //主启动类
 		public class StartGame {
 	    public static void main(String[] args) {
        JFrame jFrame = new JFrame("贪吃蛇小游戏");
        jFrame.setBounds(10,10,900,720);
        jFrame.setResizable(false);  //设置窗口大小不可变
        jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        //面板
        jFrame.add(new GamePanel());
        jFrame.setVisible(true);
    }
}

2. Prepare material pictures and write data classes

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


public class Data {
    //头部图片
    public static URL headerURL = Data.class.getResource("statics/header.png");
    public static ImageIcon header = new ImageIcon(headerURL);
    //头部上下左右
    public static URL upURL = Data.class.getResource("statics/up.png");
    public static URL downURL = Data.class.getResource("statics/down.png");
    public static URL leftURL = Data.class.getResource("statics/left.png");
    public static URL rightURL = Data.class.getResource("statics/right.png");
    public static ImageIcon up = new ImageIcon(upURL);
    public static ImageIcon down = new ImageIcon(downURL);
    public static ImageIcon left = new ImageIcon(leftURL);
    public static ImageIcon right = new ImageIcon(rightURL);
    //身体
    public static URL bodyURL = Data.class.getResource("statics/body.png");
    public static ImageIcon body = new ImageIcon(bodyURL);
    //食物
    public static URL foodURL = Data.class.getResource("statics/food.png");
    public static ImageIcon food = new ImageIcon(foodURL);

}

3. The main part of the code: implement game initialization, keyboard and event monitoring and other functions on the panel

package com.abc.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;

//游戏的面板
public class GamePanel extends JPanel implements KeyListener, ActionListener {
    //定义蛇的数据结构
    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 fx;
    //食物
    int foodx;
    int foody;
    Random random = new Random();
    int score;  //游戏分数
    //游戏当前的状态
    boolean isStart = false;
    boolean isFail = false;  
    //定时器
    Timer timer = new Timer(100,this);//100毫秒刷新一次
    //构造方法
    public GamePanel() {
        init();//初始化
        this.setFocusable(true);  //获得焦点事件
        this.addKeyListener(this);  //获得键盘监听事件
        timer.start();  //游戏一开始 定时器就启动
    }

    //初始化方法
    public void init(){
        length = 3;
        //初始化开始的蛇，给蛇定位
        snakeX[0] = 100;snakeY[0] = 100;
        snakeX[1] = 75;snakeY[1] = 100;
        snakeX[2] = 50;snakeY[2] = 100;
        fx = "R";         //初始方向向右
        //初始化食物数据
        foodx = 25 + 25*random.nextInt(34);
        foody = 75 + 25*random.nextInt(24);
        //初始化游戏分数
        score = 0;
    }


    //绘制面板
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏
        this.setBackground(Color.white);//设置面板背景色
        Data.header.paintIcon(this,g,25,11);//头部
        g.fillRect(25,75,850,600);//默认的黑色游戏区域

        //绘制小蛇
        if (fx.equals("R")){
            Data.right.paintIcon(this,g,snakeX[0],snakeY[0]);  //蛇头初始化向右
        }else if (fx.equals("L")){
            Data.left.paintIcon(this,g,snakeX[0],snakeY[0]);  //蛇头初始化向左
        }else if (fx.equals("U")){
            Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);  //蛇头初始化向上
        }else if (fx.equals("D")){
            Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);  //蛇头初始化向下
        }
        for (int i = 1; i < length; i++) {
            Data.body.paintIcon(this,g,snakeX[i],snakeY[i]);
        }

        //食物
        Data.food.paintIcon(this,g,foodx,foody);
        //积分
        g.setColor(Color.white);
        g.setFont(new Font("微软雅黑",Font.BOLD,18));
        g.drawString("长度 "+length,750,35);
        g.drawString("分数 "+score,750,50);
        //游戏状态
        if (isStart == false){
            g.setColor(Color.white);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));//设置字体
            g.drawString("按下空格开始游戏",300,300);
        }
        //失败判断
        if (isFail){
            g.setColor(Color.red);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));//设置字体
            g.drawString("游戏失败，按下空格重新开始",300,300);
        }
    }
    
    //键盘监听事件
    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();  //获取按键
        if (keyCode == KeyEvent.VK_SPACE){
            if (isFail){
                //重新开始
                isFail=false;
                init();
            }else {
                isStart =! isStart; 
            }
            repaint();
        }

        //键盘控制小蛇移动
        if (keyCode==KeyEvent.VK_UP){
            fx="U";
        }else if (keyCode==KeyEvent.VK_DOWN){
            fx="D";
        }else if (keyCode==KeyEvent.VK_LEFT){
            fx="L";
        }else if (keyCode==KeyEvent.VK_RIGHT){
            fx="R";
        }
    }
    //事件监听
    @Override
    public void actionPerformed(ActionEvent e) {
        if (isStart && isFail ==false){//如果游戏是开始状态，就让小蛇动起来
            //移动
            for (int i = length-1; i > 0 ; i--) {
                snakeX[i] = snakeX[i-1];
                snakeY[i] = snakeY[i-1];
            }
            //走向
            if (fx.equals("R")){
                snakeX[0] = snakeX[0]+25;
                //边界判断
                if (snakeX[0]>850){
                    snakeX[0]=25;
                }
            }else if (fx.equals("L")){
                snakeX[0] = snakeX[0]-25;
                if (snakeX[0]<25){
                    snakeX[0]=850;
                }
            }else if (fx.equals("U")){
                snakeY[0] = snakeY[0]-25;
                if (snakeY[0]<75){
                    snakeY[0]=650;
                }
            }else if (fx.equals("D")){
                snakeY[0] = snakeY[0]+25;
                if (snakeY[0]>650){
                    snakeY[0]=75;
                }
            }
            //吃食物
            if (snakeX[0] == foodx && snakeY[0] == foody){
                length++;
                score  = score + 10;
                //再次随机食物
                foodx = 25 + 25*random.nextInt(34);
                foody = 75 + 25*random.nextInt(24);
            }
            //失败判定,撞到自己
            for (int i = 1; i < length; i++) {
                if (snakeX[0]==snakeX[i] && snakeY[0]==snakeY[i]){
                    isFail=true;
                }
            }
            repaint();
        }
        timer.start();
    }
    @Override
    public void keyTyped(KeyEvent e) {
    }
    @Override
    public void keyReleased(KeyEvent e) {
    }
}

4. Code running renderings

Initialization interface:

##In-game interface:

End-game interface:

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