java实现一个简单的贪吃蛇小游戏

启动类：
public class StartGames {
    public static void main(String[] args) {
        JFrame frame = new JFrame("贪吃蛇小游戏");//1.绘制一个静态窗口 JFrame
        frame.setBounds(10,10,900,720);  //设置界面的大小
        frame.setResizable(false);//窗口大小不可改变
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置关闭事件
        frame.add(new GamePanel());//2.面板JPanel  可以加入到JFrame
        frame.setVisible(true);//让窗口可视化

    }
}

package com.jiang.snake;

import javafx.scene.input.KeyCode;

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 KeyListener, ActionListener {

    int length; //蛇的长度
    int[] snakeX = new int[600];//蛇的坐标
    int[] snakeY = new int[500];
    String fx;// R：右  L：左  U：上  D：下

    boolean isStart = false;  //游戏是否开始

    Timer timer = new Timer(100, this);//定时器

    //定义一个食物
    int foodX;
    int foodY;
    Random random = new Random();

    //死亡判断
    boolean isFail = false;

    //积分系统
    int score;



    //构造器
    public GamePanel() {
        init();
        //获取键盘的监听事件
        this.setFocusable(true);
        this.addKeyListener(this);
        timer.start();//让时间动起来
    }

    //初始化
    public void init() {
        length = 3;
        snakeX[0] = 100;
        snakeY[0] = 100; //头部坐标
        snakeX[1] = 75;
        snakeY[1] = 100; //第一节身体坐标
        snakeX[2] = 50;
        snakeY[2] = 100; //第二节身体坐标
        fx = "R";

        foodX = 25+25*random.nextInt(34);
        foodY = 75+25*random.nextInt(24);

        score = 0;

    }


    //画板，画界面
    //Graphics：画笔
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏
        this.setBackground(Color.WHITE); //设置背景颜色
        Data.header.paintIcon(this, g, 25, 11); //设置广告栏
        g.fillRect(25, 75, 850, 600); //绘制游戏区域

        //画一条静态的小蛇
        if (fx.equals("R")) {
            Data.right.paintIcon(this, g, snakeX[0], snakeY[0]);
        } else if (fx.equals("L")) {
            Data.left.paintIcon(this, g, snakeX[0], snakeY[0]);
        } else if (fx.equals("U")) {
            Data.up.paintIcon(this, g, snakeX[0], snakeY[0]);
        } else if (fx.equals("D")) {
            Data.down.paintIcon(this, g, snakeX[0], snakeY[0]);
        }

        for (int i = 1; i < length; i++) {
            Data.body.paintIcon(this, g, snakeX[i], snakeY[i]);//蛇的长度通过length来控制
        }


        //画积分
        g.setColor(Color.WHITE);
        g.setFont(new Font("宋体",Font.BOLD,18));
        g.drawString("长度： "+length,750,35);
        g.drawString("积分： "+score,750,50);

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

        //提示：游戏是否开始
        if (isStart == false) {
            //画一段文字
            g.setColor(Color.WHITE);//设置画笔颜色
            g.setFont(new Font("宋体", Font.BOLD, 40));//设置字体
            g.drawString("按下空格开始游戏", 300, 300);
        }

        //失败提醒
        if (isFail){
            g.setColor(Color.RED);//设置画笔颜色
            g.setFont(new Font("宋体", Font.BOLD, 40));//设置字体
            g.drawString("游戏失败，按下空格开始游戏", 200, 300);
        }

    }


    //接收键盘的输入：监听
    @Override
    public void keyPressed(KeyEvent e) {
        //键盘按下,接收键盘的输入，获取按下的哪一个键
        int keyCode = e.getKeyCode();

        if (keyCode == KeyEvent.VK_SPACE) {//如果按下的时空格键
            if (isFail){//失败：游戏再来一遍
                isFail = false;
                init();//重新初始化游戏
            }else {
                isStart = !isStart; //暂停游戏
            }
            repaint(); //刷新界面

        }
        //键盘控制走向
        if (keyCode == KeyEvent.VK_LEFT) {
            fx = "L";
        } else if (keyCode == KeyEvent.VK_RIGHT) {
            fx = "R";
        }else if (keyCode==KeyEvent.VK_UP) {
            fx = "U";
        }else if (keyCode==KeyEvent.VK_DOWN){
            fx = "D";
        }
    }
        //定时器：监听时间，帧,执行定时操作
        @Override
        public void actionPerformed (ActionEvent e){
            //如果游戏处于开始状态,并且游戏没有结束
            if (isStart && isFail == false ) {
                //右移
                for (int i = length - 1; i > 0; i--) { //除了脑袋身体都向前移动
                    snakeX[i] = snakeX[i - 1];
                    snakeY[i] = snakeY[i - 1];
                }
                //通过控制方向让头部移动
                if (fx.equals("R")){
                    snakeX[0] = snakeX[0] + 25;//头部移动
                    //边界判断
                    if (snakeX[0] > 850) {
                        isFail = true; }
                }else if (fx.equals("L")){
                    snakeX[0] = snakeX[0] - 25;//头部移动
                    //边界判断
                    if (snakeX[0] < 25) {
                        isFail = true; }
                }else if (fx.equals("U")){
                    snakeY[0] = snakeY[0] - 25;//头部移动
                    //边界判断
                    if (snakeY[0] <75 ) {
                        isFail = true;
                    }
                }else if (fx.equals("D")){
                    snakeY[0] = snakeY[0] + 25;//头部移动
                    //边界判断
                    if (snakeY[0] > 650) {
                        isFail = true;
                    }
                }

                //如果小蛇的头和食物的坐标重叠
                if (snakeX[0] == foodX && snakeY[0] == foodY){
                    //长度加一
                    length++;

                    score = score + 10;

                    //重新生成食物
                    foodX = 25+25*random.nextInt(34);
                    foodY = 75+25*random.nextInt(24);
                }
                    //结束判断
                for (int i = 1; i < length; i++) {
                    if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){
                        isFail = true;
                    }

                }

                //刷新页面
                repaint();
            }
            timer.start();//让时间动起来
        }


        @Override
        public void keyTyped (KeyEvent e){
            //键盘按下弹起：
        }

        @Override
        public void keyReleased (KeyEvent e){
            //释放某个键
        }


    }

package com.jiang.snake;


import javax.swing.*;

import java.net.URL;

//存放外部数据
public class Data {
    //头部的广告栏图片   URL:定位图片的地址      ImageIcon：图片
    public static URL headerUrl = Data.class.getResource("/statics/header.png");
    public static ImageIcon header = new ImageIcon(headerUrl);
    //头部
    public static URL upUrl = Data.class.getResource("/statics/up.png");
    public static ImageIcon up = new ImageIcon(upUrl);

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

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

    public static URL rightUrl = Data.class.getResource("/statics/right.png");
    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);


}