java练手项目：贪吃蛇小游戏

package com.itcast;

import javax.swing.*;

public class StartGames {
    public static void main(String[] args) {
        //1绘制一个静态窗口 JFrame
        JFrame frame = new JFrame("java贪吃蛇小游戏");
        frame.setBounds(10,10,900,720);//设置界面的大小
        frame.setResizable(false);//窗口大小则不可以改变
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置关闭事件，游戏可以关闭了

        //2面板JPanel 可以加入到JFrame
        frame.add(new GamePanel());

        frame.setVisible(true);//让窗口能够展现出来
    }
}

package com.itcast;

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

//存放外部数据
public class Data {

    //头部的图片 URL:点位图片的地址
    public static URL headerURL = Data.class.getResource("/static/header.png");
    public static ImageIcon header = new ImageIcon(headerURL);
    //头部
    public static URL upUrl = Data.class.getResource("/static/up.png");
    public static URL downUrl = Data.class.getResource("/static/down.png");
    public static URL rightUrl = Data.class.getResource("/static/right.png");
    public static URL leftUrl = Data.class.getResource("/static/left.png");
    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);
    //身体
    public static URL bodyURL = Data.class.getResource("/static/body.png");
    public static ImageIcon body = new ImageIcon(bodyURL);
    //食物
    public static URL foodURL = Data.class.getResource("/static/food.png");
    public static ImageIcon food = new ImageIcon(foodURL);
}

package com.itcast;

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[650];//蛇的坐标X
    int[] snakeY = new int[500];//蛇的坐标Y
    String fx;

    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;//第一个身体坐标
        snakeX[2] = 50;snakeY[2] = 100;//第二个身体坐标
        fx = "R";

        foodx = 25 + 25 * random.nextInt(34);
        foody = 75 + 25 * random.nextInt(24);

        score = 0;

    }

    //面板： 两界画蛇
    //Graphics:画笔

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏
        this.setBackground(Color.white);

        //绘制头部的广告栏
        Data.header.paintIcon(this,g,25,11);
        //绘制游戏的区域
        g.fillRect(25,75,850,600);

        //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]);//蛇的身体长度通过length来控制

        }

        //画积分
        g.setColor(Color.white);
        g.setFont(new Font("微软雅黑",Font.BOLD,18));//设置字体
        g.drawString("长度："+length,750,30);
        g.drawString("分数："+score,750,50);

        //画食物
        Data.food.paintIcon(this,g,foodx,foody);

        //游戏提示：是否开始
        if (isStart==false){
            //两一个文字：string
            g.setColor(Color.white);//设置画笔的颜色
            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);
        }

        //游戏提示：失败
        if (isFail){
            //画一个文字：string
            g.setColor(Color.RED);//设置画笔的颜色
            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",200,300);
        }
    }

    //接收键盘的输入：监听
    @Override
    public void keyPressed(KeyEvent e) {
        //获取按下的键盘是哪个键
        int keyCode = e.getKeyCode();

        if (keyCode==KeyEvent.VK_SPACE){//如果按下的是空格键
            if (isFail){//失败，重新初始化游戏
                isFail = false;
            }else {//暂停游戏
                isStart = !isStart;
            }
            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：监听事件，帧：执行定时操作
    @Override
    public void actionPerformed(ActionEvent e) {
        //如果游戏除氧开始状态
        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];
            }
            //通过控制放行让头部移动
            if (fx.equals("R")){
                snakeX[0] = snakeX[0] + 25;//头部移动
                if (snakeX[0]>850){snakeX[0] = 25;}//边界判断
            }else if (fx.equals("L")) {
                snakeX[0] = snakeX[0] - 25;//头部移动
                if (snakeX[0] < 25) { snakeX[0] = 850; }//边界判断
            }else if (fx.equals("U")) {
                snakeY[0] = snakeY[0] - 25;//头部移动
                if (snakeY[0] < 75) { snakeY[0] = 650; }//边界判断
            }else if (fx.equals("D")) {
                snakeY[0] = snakeY[0] + 25;//头部移动
                if (snakeY[0] > 650) { snakeY[0] = 75;}//边界判断
            }

            //如果小蛇的头和他们的食物坐标重合了
            if (snakeX[0]==foodx && snakeY[0]==foody){
                //长度+1
                length++;

                score = score + 10;

                //重合生成食物
                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;
                }
            }


            //刷新界面
            repaint();
        }
        timer.start();//让时间动起来
    }

    @Override
    public void keyTyped(KeyEvent e) {


    }

    @Override
    public void keyReleased(KeyEvent e) {

    }


}

素材：






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