飞机大战

[java]代码库
public class World extends JPanel {
    public static final int WIDTH = 400;//public static final int WIDTH=400;
    public static final int HEIGHT = 700;//public static final int HEIGHT=700;
    private Sky sky = new Sky();//private Sky sky=new Sky();
    private Hero hero = new Hero();//private Hero hero=new Hero();
    private FlyingObject[] enemies = {}; // 敌人数组 private FlyingObject []enemies={};
    private Bullet[] bullets = {}; // 子弹数组 private Bullet[]bullets={};
 
    public static final int START = 0;//public static final int START=0;
    public static final int RUNNING = 1;//public static final int RUNNING=1;
    public static final int PAUSE = 2;//public static final int PAUSE=2;
    public static final int GAME_OVER = 3;//public static final int GAME_OVER=3;
    private int state = START;//private int state=START;
 
    public static BufferedImage start;//public static BufferedImage start;
    public static BufferedImage pause;//public static BufferedImage pause;
    public static BufferedImage gameover;//public static BufferedImage gameover;
    static {//static{静态块
        start = Images.loadImage("start.png");//start=Images.loadImage("start.png);
        pause = Images.loadImage("pause.png");//pause=Images.loadImage("pause.png");
        gameover = Images.loadImage("gameover.png");//gameover=Images.loadImage("gameover.png");
    }
 
    public FlyingObject nextOne() {//public FlyingObject nextOne(){
        Random rand = new Random();//Random rand=new Random();
        int type = rand.nextInt(20);//int type=rand .nextInt(20);
        if (type < 5) {//if(type<5){
            return new Bee();//return new Bee();
        } else if (type < 20) {//else if (type<20){
            return new Airplane();//return new Airplane();
        } else {//else
            return new BigAirplane();//return new BigAirplane();
        }
    }
 
    int flyEnterIndex = 0;//int flyEnterIndex=0;
 
    public void enterAction() {//public void enterAction(){
        flyEnterIndex++;//flyEnterIndex++;
        if (flyEnterIndex % 40 == 0) {//if(flyEnterIndex%40==0){
            FlyingObject obj = nextOne();//FlyingObject obj=nextOne;
            enemies = Arrays.copyOf(enemies, enemies.length + 1);//enemies =Arrays.copyOf(enemies,enemies.length+1);
            enemies[enemies.length - 1] = obj;//enemies [enemies.length-1]=obj;
        }
    }
 
    public void stepAction() {//public void stepAction(){
        sky.step();//sky.step();
        for (int i = 0; i < enemies.length; i++) {//for(int i=0;i<enemies.length;i++)
            enemies[i].step();//enemies[i].step();
        }
        for (int i = 0; i < bullets.length; i++) {//for(int i=0;i<bullets.length;i++)
            bullets[i].step();//bullets[i].step();
        }
    }
 
    int shootIndex = 0;//int shootIndex=0;
 
    public void shootAction() {//public void shootAction(){
        shootIndex++;//shootIndex++;
        if (shootIndex % 30 == 0) {//if(shootIndex%30==0){
            Bullet[] bs = hero.shoot();//Bullets[]bs=hero.shoot();
            bullets = Arrays.copyOf(bullets, bullets.length + bs.length);
            System.arraycopy(bs, 0, bullets, bullets.length - bs.length, bs.length);
        }//bullets=Arrays.copyOf(bullets,bullets.length+bs.length);
    }//System.arraycopy(bs,0,bullets,bullets.length-bs.length,bs.length);
 
    private int score = 0;//private int score=0;
 
    public void bangAction() {//public void bangAction()
        for (int i = 0; i < bullets.length; i++) {//for(int i=0;i<bullets.length;i++){
            Bullet b = bullets[i];//Bullets b=bullets[i]
            for (int j = 0; j < enemies.length; j++) {//for(int j=0;j<enemies.length;j++){
                FlyingObject f = enemies[j];//FlyingObject f=enemies[j];
                if (b.isLife() && f.isLife() && b.hit(f)) {//if(b.islife()&&f.isLife()&&b.hit(f)){
                    b.goDead();//b.goDead();
                    f.goDead();//f.goDead();
                    if (f instanceof Enemy) {//if(f instanceof Enemy){
                        Enemy e = (Enemy) f;//Enemy e=(Enemy) f;
                        score += e.getScore();//score+=e.getScore();
                    }
                    if (f instanceof Award) {//if(f instanceof Award){
                        Award a = (Award) f;//Award a=(Award)f;
                        int type = a.getType();//int type=a.getType();
                        switch (type) {//switch(type){
                        case Award.DOUBLE_FIRE://case Award.DOUBLE_FIRE:
                            hero.addDoubleFire();//hero.addDoubleFire();
                            break;//break;
                        case Award.LIFE://case Award.LIFE:
                            hero.addLife();//hero.addLife
                            break;//break;
                        }
                    }
 
                }
            }
        }
    }
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