用java编写飞机大战

游戏界面使用JFrame和JPanel构建。背景图通过BG类绘制。英雄机和敌机在界面上显示并移动。子弹从英雄机发射并在屏幕上移动。游戏有四种状态：READY、RUNNING、PAUSE、GAMEOVER。状态通过鼠标点击进行切换：点击开始游戏（从READY变为RUNNING）。点击重新开始游戏（从GAMEOVER变为READY）。鼠标移出窗口时游戏暂停（从RUNNING变为PAUSE）。鼠标移入窗口时游戏继续（从PAUSE变为RUNNING）。开局默认玩家生命值为3，分数为0。每隔一定时间随机生成敌机（小飞机、大飞机、小飞碟）。敌机在屏幕上移动，并与英雄机进行碰撞检测。英雄机可以发射子弹。子弹在屏幕上移动，并与敌机进行碰撞检测。英雄机与敌机发生碰撞时，英雄机会损失一条生命值。子弹与敌机发生碰撞时，敌机会被摧毁，玩家的分增加。当子弹与奖励机发生碰撞时，奖励机会被摧毁，玩家随机获得两张奖励（生命值加1、双倍子弹）。在屏幕左上角显示当前的生命值和得分。生命值减少到0时，游戏进入结束状态。再次点击，重新开始游戏。

1.图片素材（百度网盘分享）

链接：https://pan.baidu.com/s/10QiTcddI_Zxw5jbn8fmOpA?pwd=huan

提取码：huan

2.主页面world.java

package plane.gzeu;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Arrays;
import java.util.Timer;
import java.util.TimerTask;

public class World extends JPanel {
    //ImageIcon类：保存图片的路径----->读取图片
//    ImageIcon icon = new ImageIcon("images\\background.png");
//    BG bg = new BG(0,0,420,700,2);
//    Airplane airplane = new Airplane(100,200,300,620,2);
//    Bee bee = new Bee(200,100,200,700,2);
    BG bg = new BG();
    EnemyPlane [] planes;
    Hero hero;
    int index; //用来控制敌机的数量
    Bullet[] bullets;  //创建子弹的数组
    int life; //英雄机的生命值
    int score; //分数
    //定义游戏的四种状态：准备，运行，暂停，结束（常量）
    public static final int READY = 0;
    public static final int RUNNING = 1;
    public static final int PAUSE = 2;
    public static final int GAMEOVER = 3;
    //游戏的初始状态
    int state = READY;


    //    Airplane [] airPlanes = new Airplane[10];
//    Bigairplane [] bigAirPlanes = new Bigairplane[10];
//    Bee [] bee = new Bee[10];
//    Bom [] bom = new Bom[4];
//    Bullet [] bullets = new Bullet[3];
//    Hero [] hero =new Hero[2];
    //初始化方法
    public void init(){
        bg = new BG();
        hero = new Hero();
        planes = new EnemyPlane[0]; //默认一个敌机都没有
        bullets = new Bullet[0];  //默认一个子弹都没有
        index = 0; //默认从0开始
        life = 3; //默认3条命
        score = 0; //分数为0
    }
    public World() {
        init();

//        for(int i=0;i<planes.length;i++){
//            if(i%2==0){
//                planes[i]=new Airplane();
//            }
//            else if(i%5==0 && i%2!=0){
//                planes[i] = new Bee();
//            }
//            else {
//                planes[i] = new Bigairplane();
//            }
//        }
//        for(int i =0;i<airPlanes.length;i++){
//            airPlanes[i] = new Airplane();
//            bigAirPlanes[i]=new BigAirPlane();
//            bee[i]=new Bee();
//            bom[i]=new Bom();
//            bullets[i]=new Bullet();
//            hero[i]=new Hero();
    }
    //生成敌机的方法
    public void createPlane(){
        if(index%16==0){
            int n = (int)(Math.random()*10);
            EnemyPlane plane;
            switch (n){
                case 9 :
                    plane = new Bee(); //10%生成小飞碟
                    break;
                case 8 :
                case 7 :
                    plane = new Bigairplane(); //20%生成大飞机
                    break;
                default:
                    plane = new Airplane(); //70%生成小飞机

            }
            //将敌机存入数组中之前，要先对数组进行扩容处理
            planes = Arrays.copyOf(planes,planes.length+1);
            //将生存的敌机放入数组的最后一个位置
            planes[planes.length-1] = plane;
        }
    }


//        for(int i =0;i<bigAirPlanes.length;i++){
//            bigAirPlanes[i]=new Bigairplane();
//       }
//    }

    //绘制图片printing
    @Override
    public void paint(Graphics g) { //paint挂载到当前类，当前类实例化（创建对象）时自动调用
//      super.paint(g);
//      icon.paintIcon(this,g,0,y1++); //绘制背景，默认第一个绘制
//        bg.icon.paintIcon(this,g,(int)bg.x,(int)bg.y);
//      bg.move();
//        airplane.icon.paintIcon(this,g,(int)airplane.x,(int)airplane.y);
//        bee.icon.paintIcon(this,g,(int)bee.x,(int)bee.y);
        bg.painting(g);
        hero.painting(g);
        for(int i=0;i<planes.length;i++){
            planes[i].painting(g);
        }
        for(int i=0;i<bullets.length;i++){
            bullets[i].painting(g);
        }
        g.setColor(new Color(255,255,255));
        //设置字体
        g.setFont(new Font("微软雅黑",Font.BOLD,20));
        g.drawString("生命值"+life,20,20);
        g.drawString("分数"+score,20,40);
        if(state==READY){
            Images.start.paintIcon(this,g,0,0);
        }
        if(state==PAUSE){
            Images.pause.paintIcon(this,g,0,0);
        }
        if(state==GAMEOVER){
            Images.gameover.paintIcon(this,g,0,0);
        }

//            for(int i =0;i<airPlanes.length;i++){
//                airPlanes[i].painting(g);
//            bigAirPlanes[i].painting(g);
//            bee[i].painting(g);
//            bom[i].painting(g);
//            bullets[i].painting(g);
//            hero[i].painting(g);
//            }
//            for(int i =0;i<bigAirPlanes.length;i++){
//                bigAirPlanes[i].painting(g);
//            }
        repaint();//刷新窗口
    }
    public static void main(String[] args) {
        //1.显示画框（外层）:JFrame
        JFrame jf = new JFrame();

        //2.显示面板:Jpanel
        World jp =new World();

        //3.将面板放入画框中:
        jf.add(jp);

        //对窗口进行设置
        jf.setTitle("我的窗口");//设置标题
        jf.setSize(436,700); //设置窗口大小
        jf.setLocationRelativeTo(null); //居中显示
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //设置关闭窗口后自动结束程序

        //4.显示窗口
        jf.setVisible(true);
        jp.action();
    }
    //唤醒定时器的方法
    public void action(){
        java.util.Timer timer = new Timer();
        MyTesk mt = new MyTesk();
        timer.schedule(mt,1000,1000/50);
        this.addMouseListener(new MouseAdapter() {
            //监听鼠标点击
            @Override
            public void mouseClicked(MouseEvent e) {
                if(state==READY){
                    state=RUNNING;
                }
                if(state==GAMEOVER){
                    state=READY;
                    init();
                }
            }
            //鼠标移除
            @Override
            public void mouseExited(MouseEvent e) {
//                System.out.println("鼠标移出");
                if(state==RUNNING){
                    state=PAUSE;
                }
            }
            //鼠标移入
            @Override
            public void mouseEntered(MouseEvent e) {
                if(state==PAUSE){
                    state=RUNNING;
                }
            }
        });
        //匿名内部类
        MouseAdapter mouseAdapter = new MouseAdapter() {
            @Override
            public void mouseMoved(MouseEvent e) {
                if(state==RUNNING){
                    int x = e.getX();
                    int y = e.getY();
                    hero.move(x,y);
                }
            }
        };
        //安装监听器
        this.addMouseMotionListener(mouseAdapter);
    }
    public void createBullet(){
        if(!hero.isLiving()){ //英雄机死亡不发射子弹
            return;
        }
        if(index%17==0){
            Bullet[] bullets1 = hero.double_fire();
            //俩个数组的合并
           Bullet[] arr = Arrays.copyOf(bullets,bullets.length+bullets1.length);
            System.arraycopy(bullets1,0,arr,bullets.length,bullets1.length);
            bullets = arr;
//            Bullet bullet =hero.fire();  //英雄机调用fire方法生成子弹
//            //将子弹放入数组中
//            bullets = Arrays.copyOf(bullets,bullets.length+1); //子弹扩容
//            bullets[bullets.length-1] = bullet;
        }
    }
    //加分的方法
    public void addScore(FlyingObjesct plane){
        if(plane.isDead()){
            if(plane instanceof Enemy){
                Enemy enemy = (Enemy) plane; //需要做一个强制转化
                score += enemy.getScore();
            }
            if(plane instanceof Aword){
                Aword aword = (Aword) plane;
                int  type =aword.getAword();
                if(type == Aword.DOUBLE_FIRE){
                    hero.getdouble_fire();
                }
                if(type == Aword.LIFE){
                    life++;
                }
            }
        }
    }
    //检测敌机与英雄机的碰撞
    public void hero_hit(){
        if(hero.isLiving()){
            for(int i=0;i<planes.length;i++){
                if(!planes[i].isLiving()){
                    continue;
                }
                if(hero.bong(planes[i])){
                    hero.goDead();
                    planes[i].goDead();
                    break;
                }
            }
        }
        else if(hero.isWait()){ //僵尸状态
            if(life>1){
                //重新开始
                hero = new Hero();
                //清屏
                for(int i=0;i<planes.length;i++){
                    planes[i].goDead();
                }
                life--;
            }

            else{
                life--;
                state=GAMEOVER;
            }

        }
    }
    //检测每个敌机与子弹的碰撞情况
    public void hit(){
        for(int i=0;i<bullets.length;i++){
            Bullet bullet = bullets[i]; //拿出每一颗子弹
            if(!bullet.isLiving()){
                continue;
            }
            for(int j=0;j<planes.length;j++){
                FlyingObjesct p = planes[j];
                if(!p.isLiving()){
                    continue;
                }
                if(p.bong(bullet)){  //被击中
                    p.attack();
                    bullet.goDead();
                    addScore(p);
                }
            }
        }
    }

    //清理爆炸的飞机
    public void clean(){
        //清除飞机
        EnemyPlane[] living = new EnemyPlane[planes.length];
        int index = 0;
        for(int i=0;i<planes.length;i++){  //遍历敌机数组
            if(planes[i].isWait() || planes[i].outOfBound()){  //如果是等待状态的效果就跳过
                continue;
            }
            living[index++] = planes[i];  //将不是等待状态的敌机存在living里面
        }
        planes = Arrays.copyOf(living,index);
        //清除子弹
        Bullet[] livingBullet = new Bullet[bullets.length];
        index = 0;
        for(int i=0;i<bullets.length;i++){
            if(bullets[i].isDead() || bullets[i].outOfBound()){    //如果是已经爆炸的子弹就跳过
                continue;
            }
            livingBullet[index++] = bullets[i];
        }
        bullets = Arrays.copyOf(livingBullet,index);
    }


    class MyTesk extends TimerTask {

        @Override
        public void run() {
            index++;
            if(state == RUNNING){
                createPlane(); //调用生成敌机的方法
                createBullet(); //调用生成子弹的方法
                hit();//调用子弹击打的效果
                clean(); //调用清理敌机方法
                hero_hit();
                bg.move();
                for(int i =0;i<planes.length;i++){
                    planes[i].move();
                }
                for(int i =0;i<bullets.length;i++){
                    bullets[i].move();
                }
            }

        }
    }
}

3.小飞机类Airplane.java

package plane.gzeu;

import javax.swing.*;
//飞机类
public class Airplane extends EnemyPlane implements Enemy{ // 实现接口时，要实现接口中的方法
    public Airplane(){
        this.images = Images.airplane;
        w = images[0].getIconWidth();
        h = images[0].getIconHeight();
        x=(int)(Math.random()*(420-images[0].getIconWidth()));
        y=-2*images[0].getIconHeight();
        this.step=(Math.random()*2.5+0.7);
        this.icon=new ImageIcon("images\\airplane1.png");
//        this.icon = Images.airplane[0];
    }
    public Airplane(double x, double y, double w, double h,double speed) {
//        super(x, y, w, h);
        this.step=speed;
        this.icon=Images.airplane[0];
    }


    @Override
    public int getScore() {
        return 10;
    }
}

4.大飞机类Bigairplane

package plane.gzeu;

//大飞机类
public class Bigairplane extends EnemyPlane implements Enemy{
    public Bigairplane(double x, double y, double w, double h,double step) {
//        super(x, y, w, h);
        this.step=step;
        this.icon = Images.bigairplane[0];
    }
    public Bigairplane(){
        this.images = Images.bigairplane; //初始化数组
        w = images[0].getIconWidth();
        h = images[0].getIconHeight();
        x=(int)(Math.random()*(420-images[0].getIconWidth()));
        y=-2*images[0].getIconHeight();
        this.step=(Math.random()*3.5+0.7);
//        this.icon = Images.bigairplane[0];
        life = 4;
    }

    @Override
    public int getScore() {
        return 50;
    }
}

5.英雄机类Hero.java

package plane.gzeu;

import javax.swing.*;

import static plane.gzeu.Images.bullet;

public class Hero  extends EnemyPlane{
    public Hero(){
        this.images = Images.hero;
        x=431/2-images[0].getIconWidth()/2;
        y=510;
        w=images[0].getIconWidth();
        h=images[0].getIconHeight();
//        this.speed=0.2;
        this.icon = Images.hero[0];
    }
    public Hero(double x, double y, double w, double h,double step) {
//        super(x, y, w, h);
        this.step=step;
//        this.icon = new ImageIcon("images\\hero1.png"); //设置了Images类直接调用类名就可以引用图片
        this.icon = Images.hero[0];
    }
    @Override
    public void move() {}
    //接收鼠标的坐标
    public void move(int x,int y) {
        this.x= x-images[0].getIconWidth()/2;
        this.y = y-images[0].getIconHeight()/2;
    }
    /*
     * 子弹的位置（在英雄机上） b.x = h.x-images[0].getIconWidth()/2; b.y=h.y
     * 子弹的移动:向上：b.y-=b.step;
     * 子弹是无限的：数序扩容
     * 射击方法：当英雄机调用一次射击方法时，就发射一个子弹
     * */
    //射击的方法
    public Bullet fire(){
        double x = this.x+w/2-4; //获取英雄机的x坐标
        Bullet bullet = new Bullet(x,y);//将处理过后的坐标传给子弹
        return bullet; //将子弹返回
    }
    //获取双倍子弹的方法
    int doubleTime = 0; // 双倍子弹的时间，20次
    public void getdouble_fire(){
        doubleTime = 20;
    }
    //双倍子弹方法
    public Bullet[] double_fire(){
        if(doubleTime>0){
            double x = this.x+w/2-7;
            double x1 = this.x+w/2-2; //获取英雄机的x坐标
            Bullet bullet1 = new Bullet(x,y);
            Bullet bullet2 = new Bullet(x1,y);//将处理过后的坐标传给子弹
            Bullet [] bullets = new Bullet[]{bullet1,bullet2};
//            return new Bullet[]{bullet1,bullet2};
            return bullets;
        }
        else {
            double x = this.x+w/2-4; //获取英雄机的x坐标
            Bullet bullet1 = new Bullet(x,y);
            return new Bullet[]{bullet1};
        }
//
    }

    //测试
//    public static void main(String[] args) {
//        Hero hero = new Hero();
//        hero.move(200,300);
//        Bullet bullet = hero.fire();
//        System.out.println(bullet.x+"  "+bullet.y);
//    }
}

6.敌机类Bee.java

package plane.gzeu;

import javax.swing.*;

public class Bee extends EnemyPlane implements Aword {
    double speed1;
    public Bee(){
        this.images = Images.bee;
        w = images[0].getIconWidth();
        h = images[0].getIconHeight();
        x=(int)(Math.random()*(420-images[0].getIconWidth()));
        y=-2*images[0].getIconHeight();
        this.step=(Math.random()*4.5+2.5);
        this.speed1=(Math.random()*3.5+0.5);
//        this.icon=new ImageIcon("images\\bee0.png");
        this.icon=Images.bee[0];
        life = 6;
    }
    public Bee(double x, double y, double w, double h,double step) {
//        super(x, y, w, h);
        this.step=step;
        this.icon = Images.bee[0];
    }
    @Override
    public void move() {
        y+=speed1;
        x+=step;
        if(x>431-images[0].getIconWidth()){
            step = -step;
        }
        if(x<=0){
            step = -step;
        }
    }

    @Override
    public int getAword() {
        return Math.random()>0.5?DOUBLE_FIRE:LIFE;
    }
}

7.背景类BG.java

package plane.gzeu;

import javax.swing.*;
import java.awt.*;

//背景类(子类)
//继承FlyingObjesct类，得到FlyingObjesct类的方法及属性
public class BG extends FlyingObjesct {
    double y0;
    public BG(){
        x = 0;
        y = 0;
        icon = Images.bg;
        w = icon.getIconWidth();
        h = icon.getIconHeight();
        y0 = -h;
        step = 2;

    }
    public BG(double x, double y, double w, double h,double step) {
        super(x, y, w, h); //重载：调用父类的构造方法，实现方法复用
        this.step = step;
        this.icon = Images.bg; //背景是固定的
    }
    public void painting(Graphics g){
        icon.paintIcon(null,g,(int)x,(int)y);
        icon.paintIcon(null,g,(int)x,(int)y0);
    }
    @Override
    public void move() {
        y+=step;
        y0+=step;
        if(y>=h){
            y=-h;
        }
        if(y0>=h){
            y0=-h;
        }
    }
}

8.爆炸类Bom.java

package plane.gzeu;

import javax.swing.*;


public class Bom extends EnemyPlane{
    public Bom(){
        x=(int)(Math.random()*370);
        y=(int)(Math.random()*370);
        this.step = 0.2;
        this.icon = Images.bom[0];
    }
    public Bom(double x, double y, double w, double h, double speed) {//要重写父类的构造方法。新增一个速度
//        super(x, y, w, h);//重载：调用父类的构造方法，实现方法复用
        this.step=speed;
        this.icon=Images.bom[0];
    }
}

9.子弹类Bullet.java

package plane.gzeu;

import javax.swing.*;

//继承FlyingObjesct类，得到FlyingObjesct类的方法及属性
public class Bullet extends EnemyPlane {
    public Bullet(double x,double y){
        this.icon = Images.bullet;
        w = icon.getIconWidth();
        h = icon.getIconHeight();
        this.x = x;
        this.y = y;
        step = 2;
    }
    public Bullet(){
        x=(int)(Math.random()*370);
        y=(int)(Math.random()*370);
        this.step = 0.2;
        this.icon = Images.bullet;
    }
    public Bullet(double x, double y, double w, double h, double step) {
//        super(x, y, w, h); //重载：调用父类的构造方法，实现方法复用
        this.step = step;
        this.icon = Images.bullet; //背景是固定的
    }

    @Override
    public void move() {
        y-=step;
    }
}

10.三种敌机总类EnemyPlane.java

package plane.gzeu;
public abstract class EnemyPlane extends FlyingObjesct {
    @Override
    public void move() {
        y+=step;
    }
}

11.飞行物的总类(父类)FlyingObjesct.java

package plane.gzeu;

import javax.swing.*;
import java.awt.*;

//飞行物的总类(父类)
public abstract class FlyingObjesct {
    public static final int LIVING = 1; //活着
    public static final int DEAD = 0; //死亡
    public static final int WAIT = -1;  //等待死亡（播放爆炸动画）
    //飞机默认是活着的
    public int state = LIVING;
    //飞机的生命值
    public int life = 2;
    public double x,y,step,w,h;//step速度
    public ImageIcon icon; //图片
//    Images images;
    public ImageIcon[] images; //数组
    public int index = 0;
    public ImageIcon [] boms = Images.bom; //存放爆炸效果的图片
    //赋初值：构造方法
    //快速生成构建方法：快捷键Alt+Insert
    public FlyingObjesct(double x, double y, double w, double h) {
        this.x = x;
        this.y = y;
        this.w = w;
        this.h = h;

    }
    //当飞机击打一次，生命值减一，当生命值为0时，进入死亡状态
    public boolean attack(){
        if(life>0){
           life--;
           if(life==0){
               state = DEAD;
           }
           return true;
        }
        return false;
    }
//让敌机快速去死
    public boolean goDead(){
        if(state==LIVING){
            life = 0;
            state = DEAD;
            return true;
        }else{
            return false;
        }
    }
    //判断飞机的三种状态
    public boolean isLiving(){
        return state==LIVING;  //判断是否活着
    }
    public boolean isDead(){
        return state==DEAD;  //判断是否死了
    }
    public boolean isWait(){
        return state==WAIT;  //判断是否等待死亡
    }

    /*实现动画效果
     * 1.用数组存储动画效果图片
     * 2.初始化数组
     * 3.定义一个计数器，作为切换图片的控制条件
     * 4.写一个方法，实现切换图片的操作
     * */
    int i;
    public void nextImage(){
        switch (state){
            case LIVING:
                if(images == null) {
                    return;
                }
                icon = images[index++/300%images.length]; //0-[数组的长度-1]
                break;
            case DEAD:
                if(boms==null){
                    return;
                }
                if(i++/300==boms.length){
                    state = WAIT;
                    return;
                }
                icon = boms[i++/300];
        }


    }

    public FlyingObjesct(){}//无参构造

    //移动
    public abstract void move();

    //绘制图形 方法
    public void painting(Graphics g){
        nextImage();
        icon.paintIcon(null,g,(int)x,(int)y);
    }
    //检测敌机是否碰到子弹：判断条件中心距c=H/2+h/2
    public boolean bong(FlyingObjesct bullet){
        FlyingObjesct p =this;
        double a = Math.min(p.w,p.h)/2;
        double b = Math.min(bullet.w,bullet.h)/2;
        double x1=p.x+p.w/2;
        double y1=p.y+p.h/2;
        double x2=bullet.x+bullet.w/2;
        double y2=bullet.y+bullet.h/2;
        double c = Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
        return c<=a+b;
    }
    //清除越界的敌机和子弹条件: y<-h-100 || y>700+100
    public boolean outOfBound(){
        if(y<-h-100){
            return true;
        }else if(y>700+100){
            return true;
        }
        return false;
    }
}

12.图片类Images.java

package plane.gzeu;

import javax.swing.*;

public class Images {
    public static ImageIcon bg;
    public static ImageIcon bullet;
    public static ImageIcon start;
    public static ImageIcon pause;
    public static ImageIcon gameover;
    public static ImageIcon[] hero;
    public static ImageIcon[] bigairplane;
    public static ImageIcon[] bee;
    public static ImageIcon[] airplane;
    public static ImageIcon[] bom;
    static {
        airplane = new ImageIcon[2];
        airplane[0] = new ImageIcon("images/airplane0.png");
        airplane[1] = new ImageIcon("images/airplane1.png");
        bigairplane = new ImageIcon[2];
        bigairplane[0] = new ImageIcon("images/bigairplane0.png");
        bigairplane[1] = new ImageIcon("images/bigairplane1.png");
        bee = new ImageIcon[2];
        bee[0] = new ImageIcon("images\\bee0.png");
        bee[1] = new ImageIcon("images\\bee1.png");
        bom = new ImageIcon[4];
        bom[0] = new ImageIcon("images/bom1.png");
        bom[1] = new ImageIcon("images/bom2.png");
        bom[2] = new ImageIcon("images/bom3.png");
        bom[3] = new ImageIcon("images/bom4.png");
        bg = new ImageIcon("images\\background.png");
        bullet = new ImageIcon("images\\bullet.png");
        start = new ImageIcon("images\\start.png");
        pause = new ImageIcon("images\\pause.png");
        gameover = new ImageIcon("images\\gameover.png");
        hero = new ImageIcon[2];
        hero[0] = new ImageIcon("images\\hero0.png");
        hero[1] = new ImageIcon("images\\hero1.png");

    }
    //测试图片是否传过来了
    public static void main(String[] args) {
        System.out.println(start.getImageLoadStatus()); //如果输出8那图片传过来了，输出其他数字有问题
        System.out.println(bg.getImageLoadStatus());
        System.out.println(bom[0].getImageLoadStatus());
        System.out.println(bee[1].getImageLoadStatus());
        System.out.println(airplane[1].getImageLoadStatus());

    }

}

13.获得奖励的接口Aword.java

package plane.gzeu;
//获得奖励的接口
public interface Aword {
    int DOUBLE_FIRE = 1; //第一种奖励，双倍火力
    int LIFE = 2; //加生命值
   int getAword(); //获得奖励的方法
}

14.获得分数的接口Enemy.java

package plane.gzeu;
//获得分数的接口
public interface Enemy { //加分
//    int a = 5;//都是静态常量
//    public abstract void add(); //都是抽象方法
    public int getScore(); //获得分数的方法
}

运行界面：

开始界面

存活界面：

暂停界面

结束界面