Java实现大鱼吃小鱼游戏（开源）

前言 ：

游戏参考于B站_【尚学堂】大鱼吃小鱼,主体框架不变，代码稍有改动。

大鱼吃小鱼：又称吞食鱼，是一款动作类小游戏。通过不断的吞吃比自己小的鱼类快速成长，最终成为海洋霸主。

游戏主要Java知识：变量、数据类型、判断语句、循环结构、类的继承、简单窗口创建、图形图片绘制、双缓存技术、鼠标事件、键盘事件。

非常适合在同学Java学习结束后，作为不错的结课作业或者练手项目。

源码已经在文章结束语后打包，有兴趣的同学可以免费下载，创作不易，点个免费的赞支持一下！

游戏主要框架：

游戏素材：

游戏代码：

（1）Bg类

import java.awt.*;

public class Bg {
    void paintSelf(Graphics g, int fishLevel) {
        g.drawImage(GameUtils.bgimg, 0, 0, null);
        switch (GameWin.state) {
            case 0:
                GameUtils.drawWord(g, "开始", Color.red, 80, 600, 400);
                break;
            case 1:
                GameUtils.drawWord(g, "积分" + GameUtils.count, Color.ORANGE, 50, 200, 120);
                GameUtils.drawWord(g, "难度" + GameUtils.level, Color.ORANGE, 50, 600, 120);
                GameUtils.drawWord(g, "等级" + fishLevel, Color.ORANGE, 50, 1000, 120);
                break;
            case 2:
                GameUtils.drawWord(g, "积分" + GameUtils.count, Color.ORANGE, 50, 200, 120);
                GameUtils.drawWord(g, "难度" + GameUtils.level, Color.ORANGE, 50, 600, 120);
                GameUtils.drawWord(g, "等级" + fishLevel, Color.ORANGE, 50, 1000, 120);
                GameUtils.drawWord(g, "失败", Color.red, 80, 580, 450);
                break;
            case 3:
                GameUtils.drawWord(g, "积分" + GameUtils.count, Color.ORANGE, 50, 200, 120);
                GameUtils.drawWord(g, "难度" + GameUtils.level, Color.ORANGE, 50, 600, 120);
                GameUtils.drawWord(g, "等级" + fishLevel, Color.ORANGE, 50, 1000, 120);
                GameUtils.drawWord(g, "胜利了！", Color.ORANGE, 80, 580, 450);
            case 4:
                break;
            default:
        }
    }
}

（2）Enamy类

import java.awt.*;

//敌方鱼父类
public class Enamy {
    //定义图片
    Image img;

    //物体坐标
    int x;
    int y;
    int width;
    int height;

    //移动速度
    int speed;

    //方向
    int dir = 1;

    //类型
    int type;

    //分值
    int count;

    //绘制自身方法
    public void paintSelf(Graphics g) {
        g.drawImage(img, x, y, width, height, null);
    }

    //获取自身矩形，用于碰撞检测
    public Rectangle getRec() {
        return new Rectangle(x, y, width - 45, height - 30);
    }
}

//敌方鱼左类
class Enamy_1_L extends Enamy {
    Enamy_1_L() {
        this.x = -45;
        this.y = (int) (Math.random() * 980);
        this.width = 40;
        this.height = 55;
        this.speed = 1;
        this.count = 1;
        this.type = 1;
        this.img = GameUtils.enamyl_1img;
    }

    @Override
    public Rectangle getRec() {
        return new Rectangle(x, y, width, height);
    }
}

//敌方鱼右类
class Enamy_1_R extends Enamy_1_L {
    Enamy_1_R() {
        this.x = 1400;
        dir = -1;
        this.img = GameUtils.enamyr_1img;
    }
}

class Enamy_2_L extends Enamy {
    Enamy_2_L() {
        this.x = -100;
        this.y = (int) (Math.random() * 900 + 100);
        this.width = 180;
        this.height = 80;
        this.speed = 5;
        this.count = 3;
        this.type = 2;
        this.img = GameUtils.enamyl_2img;
    }
}

class Enamy_2_R extends Enamy_2_L {
    Enamy_2_R() {
        this.x = 1400;
        dir = -1;
        this.img = GameUtils.enamyr_2img;
    }
}

class Enamy_3_L extends Enamy {
    Enamy_3_L() {
        this.x = -300;
        this.y = (int) (Math.random() * 980);
        this.width = 250;
        this.height = 150;
        this.speed = 3;
        this.count = 10;
        this.type = 3;
        this.img = GameUtils.enamyl_3img;
    }
}

class Enamy_3_R extends Enamy_3_L {
    Enamy_3_R() {
        this.x = 1400;
        dir = -1;
        this.img = GameUtils.enamyr_3img;
    }
}

class Enamy_Boss extends Enamy {
    Enamy_Boss() {
        this.x = -1200;
        this.y = (int) (Math.random() * 700 + 100);
        this.width = 250;
        this.height = 200;
        this.speed = 80;
        this.type = 10;
        this.img = GameUtils.bossimg;
    }
}

（3）GameUtils类

import java.awt.*;
import java.util.ArrayList;
import java.util.List;

public class GameUtils {

    //方向
    static boolean UP = false;
    static boolean DOWN = false;
    static boolean LEFT = false;
    static boolean RIGHT = false;

    //分数
    static int count = 0;

    //关卡等级
    static int level = 0;

    //背景图
    public static Image bgimg = Toolkit.getDefaultToolkit().createImage("src/images/sea.jpg");

    //敌方鱼类集合
    public static List<Enamy> EnamyList = new ArrayList<>();

    //敌方鱼类
    public static Image enamyl_1img = Toolkit.getDefaultToolkit().createImage("src/images/enemyFish/fish1_r.gif");
    public static Image enamyr_1img = Toolkit.getDefaultToolkit().createImage("src/images/enemyFish/fish1_l.gif");
    public static Image enamyl_2img = Toolkit.getDefaultToolkit().createImage("src/images/enemyFish/fish2_r.png");
    public static Image enamyr_2img = Toolkit.getDefaultToolkit().createImage("src/images/enemyFish/fish2_l.png");
    public static Image enamyl_3img = Toolkit.getDefaultToolkit().createImage("src/images/enemyFish/fish3_r.gif");
    public static Image enamyr_3img = Toolkit.getDefaultToolkit().createImage("src/images/enemyFish/fish3_l.gif");
    public static Image bossimg = Toolkit.getDefaultToolkit().createImage("src/images/enemyFish/boss.gif");

    //我方鱼类
    public static Image MyFishimg_L = Toolkit.getDefaultToolkit().createImage("src/images/myFish/myfish_left.gif");
    public static Image MyFishimg_R = Toolkit.getDefaultToolkit().createImage("src/images/myFish/myfish_right.gif");

    //绘制文字的工具类
    public static void drawWord(Graphics g, String str, Color color, int size, int x, int y) {
        g.setColor(color);
        g.setFont(new Font("宋体", Font.BOLD, size));
        g.drawString(str, x, y);
    }
}

（4）GameWin类

import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class GameWin extends JFrame {

    /**
     * 游戏状态 0未开始,1游戏中,2通关失败,3通关成功,4暂停,5重新开始
     */

    //定义游戏默认状态
    static int state = 0;

    //双缓存图片
    Image offScreenImage;

    //窗口宽高
    int width = 1320;
    int height = 780;

    //计数器
    double random;
    int time = 0;

    //背景对象
    Bg bg = new Bg();

    //敌方鱼类
    Enamy enamy = new Enamy_1_L();

    //我方鱼类
    MyFish myFish = new MyFish();

    //boss鱼类
    Enamy boss;

    //是否生成boss
    boolean isboss = false;

    /**
     * 游戏操作方法
     */
    public void launch() {
        //界面布局
        this.setVisible(true);
        this.setSize(width, height);
        this.setLocationRelativeTo(null);
        this.setTitle("大鱼吃小鱼");
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //开始或者失败后重新游戏
        this.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                super.mouseClicked(e);
                if (e.getButton() == 1 && state == 0) {
                    state = 1;
                    repaint();
                }
                if (e.getButton() == 1 && (state == 2 || state == 3)) {
                    reGame();
                    state = 1;
                }
            }
        });

        //键盘移动我方鱼类
        this.addKeyListener(new KeyAdapter() {
            @Override //按压
            public void keyPressed(KeyEvent e) {
                super.keyPressed(e);
                if (e.getKeyCode() == 87) {
                    GameUtils.UP = true;
                }
                if (e.getKeyCode() == 83) {
                    GameUtils.DOWN = true;
                }
                if (e.getKeyCode() == 65) {
                    GameUtils.LEFT = true;
                }
                if (e.getKeyCode() == 68) {
                    GameUtils.RIGHT = true;
                }
                if (e.getKeyCode() == 32) {
                    switch (state) {
                        case 1:
                            state = 4;
                            GameUtils.drawWord(getGraphics(), "游戏暂停！", Color.red, 50, 580, 450);
                            break;
                        case 4:
                            state = 1;
                            break;
                    }
                }
            }

            @Override //抬起
            public void keyReleased(KeyEvent e) {
                if (e.getKeyCode() == 87) {
                    GameUtils.UP = false;
                }
                if (e.getKeyCode() == 83) {
                    GameUtils.DOWN = false;
                }
                if (e.getKeyCode() == 65) {
                    GameUtils.LEFT = false;
                }
                if (e.getKeyCode() == 68) {
                    GameUtils.RIGHT = false;
                }
            }
        });

        //线程操纵游戏帧率
        while (true) {
            repaint();
            time++;
            try {
                Thread.sleep(40);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }

    /**
     * 游戏阶段绘制鱼类
     */
    @Override
    public void paint(Graphics g) {
        //双缓存加载图片
        offScreenImage = createImage(width, height);
        Graphics gImage = offScreenImage.getGraphics();
        bg.paintSelf(gImage, myFish.level);

        switch (state) {
            case 0:
                break;
            case 1:
                myFish.paintSelf(gImage);
                logic();
                for (Enamy enamy : GameUtils.EnamyList) {
                    enamy.paintSelf(gImage);
                }
                if (isboss) {
                    boss.x = boss.x + boss.dir * boss.speed;
                    boss.paintSelf(gImage);
                    if (boss.x < 0) {
                        gImage.setColor(Color.red);
                        gImage.fillRect(boss.x, boss.y + 100, 2400, boss.height / 20);
                    }
                }
                break;
            case 2:
                for (Enamy enamy : GameUtils.EnamyList) {
                    enamy.paintSelf(gImage);
                }
                if (isboss) {
                    boss.paintSelf(gImage);
                }
                break;
            case 3:
                myFish.paintSelf(gImage);
                break;
            case 4:
                return;
            default:
        }
        g.drawImage(offScreenImage, 0, 0, null);
    }

    /**
     * 游戏关卡难度逻辑
     */
    void logic() {
        //关卡难度
        if (GameUtils.count < 5) {
            GameUtils.level = 0;
        } else if (GameUtils.count < 15) {
            GameUtils.level = 1;
        } else if (GameUtils.count < 40) {
            GameUtils.level = 2;
        } else if (GameUtils.count < 75) {
            GameUtils.level = 3;
        } else if (GameUtils.count > 150) {
            state = 3;
        }

        //我方鱼升级
        if (29 < GameUtils.count && GameUtils.count < 79) {
            myFish.level = 2;
        } else if (GameUtils.count > 79) {
            myFish.level = 3;
        }

        //阶段生成敌方鱼
        random = Math.random();
        switch (GameUtils.level) {
            case 3:
                if (time % 120 == 0) {
                    boss = new Enamy_Boss();
                    isboss = true;
                }
            case 2:
                if (time % 120 == 0) {
                    if (random < 0.5) {
                        enamy = new Enamy_3_L();
                    } else {
                        enamy = new Enamy_3_R();
                    }
                }
                GameUtils.EnamyList.add(enamy);
            case 1:
                if (time % 60 == 0) {
                    if (random < 0.5) {
                        enamy = new Enamy_2_L();
                    } else {
                        enamy = new Enamy_2_R();
                    }
                }
                GameUtils.EnamyList.add(enamy);
            case 0:
                if (time % 10 == 0) {
                    if (random < 0.5) {
                        enamy = new Enamy_1_L();
                    } else {
                        enamy = new Enamy_1_R();
                    }
                }
                GameUtils.EnamyList.add(enamy);
                break;
            default:
        }

        //生成敌方鱼
        for (Enamy enamy : GameUtils.EnamyList) {
            enamy.x = enamy.x + enamy.dir * enamy.speed;

            //boss鱼碰撞检测
            if (isboss) {
                if (boss.getRec().intersects(enamy.getRec())) {
                    enamy.x = -200;
                    enamy.y = -200;
                }
                if (boss.getRec().intersects(myFish.getRec())) {
                    state = 2;
                }
            }

            //我方鱼与敌方鱼碰撞检测
            if (myFish.getRec().intersects(enamy.getRec())) {
                if (myFish.level >= enamy.type) {
                    enamy.x = -200;
                    enamy.y = -200;
                    GameUtils.count += enamy.count;
                } else {
                    state = 2;
                }
            }
        }
    }

    public static void main(String[] args) {
        GameWin gameWin = new GameWin();
        gameWin.launch();
    }

    //重新开始
    void reGame() {
        GameUtils.EnamyList.clear();
        time = 0;
        myFish.level = 1;
        GameUtils.count = 0;
        myFish.x = 650;
        myFish.y = 400;
        myFish.width = 45;
        myFish.height = 45;
        boss = null;
        isboss = false;
    }
}

（5）MyFish类

import java.awt.*;

public class MyFish {
    //图片
    Image img = GameUtils.MyFishimg_L;

    //坐标
    int x = 650;
    int y = 400;
    int width = 45;
    int height = 45;

    //移动速度
    int speed = 20;

    //等级
    int level = 1;

    //移动
    void logic() {
        if (GameUtils.UP) {
            y = y - speed;
        }
        if (GameUtils.DOWN) {
            y = y + speed;
        }
        if (GameUtils.LEFT) {
            x = x - speed;
            img = GameUtils.MyFishimg_L;
        }
        if (GameUtils.RIGHT) {
            x = x + speed;
            img = GameUtils.MyFishimg_R;
        }
    }

    //绘制自身方法
    public void paintSelf(Graphics g) {
        logic();
        g.drawImage(img, x, y, width + GameUtils.count, height + GameUtils.count, null);
    }

    //获取自身矩形方法，用于碰撞检测
    public Rectangle getRec() {
        return new Rectangle(x, y, width + GameUtils.count, height + GameUtils.count);
    }
}

结束语：

游戏还有很多缺陷地方，比如我方鱼可以离开界面，敌方鱼在离开界面后没有及时清除，游戏玩法过于简单。都需要小伙伴们自己去改进，挖掘。

游戏源码下载运行时，出现报错，游戏界面白屏等问题，都可以私信帮忙解决。

游戏源码如下：

链接：链接：https://pan.baidu.com/s/1hDHRcIRxI_pmGIJZRoljvA?pwd=77me
提取码：77me