JFrame jf = new JFrame("飛機大戰(zhàn)"); //創(chuàng)建窗體
        jf.setSize(670,800);
        jf.setLocationRelativeTo(null);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        jf.setLayout(new BorderLayout()); //布局

        //創(chuàng)建三個JPanel,左上為按鈕，左下為分數(shù)顯示 右為游戲頁面
        JPanel left = new JPanel(); 
        JPanel leftUp = new JPanel();  //左上
        JPanel leftDown = new JPanel();   //左下
        game = new JPanel();   //游戲顯示區(qū)

        left.setPreferredSize(new Dimension(170,800));
        left.setBackground(new Color(-3355444));
        jf.add(left,BorderLayout.WEST);

        jf.add(game,BorderLayout.CENTER);
        game.requestFocus();
        left.setLayout(new BorderLayout());

        leftUp.setPreferredSize(new Dimension(0,250));
        leftUp.setBackground(new Color(-3355444));
        left.add(leftUp,BorderLayout.NORTH);

        leftDown.setBackground(new Color(-6710887));
        leftDown.setPreferredSize(new Dimension(0,550));
        left.add(leftDown,BorderLayout.SOUTH);

public boolean judge_crash(FlyObject fo){
        if(x+sizeX<fo.x || y+sizeY<fo.y || x > fo.x + fo.sizeX || y > fo.y+ fo.sizeY ){
            return false;
        }else{
            return true;
        }
    }

  String fileName_0 = "src\\plane2\\z_img\\img_bg_0.jpg"; //相對地址（和絕對地址區(qū)分開）
        BufferedImage bufferedImage;  
        bufferedImage = ImageIO.read(new File(fileName_0));  //將文件讀出記錄在bufferedImage中，記得拋出異常
        g.drawImage(bufferedImage,0,0,null);   // 將bufferedImage中的內(nèi)容畫在畫筆g對應(yīng)的地方

img – the specified image to be drawn. This method does nothing if img is null.
        dx1 – the x coordinate of the first corner of the destination rectangle. 
        dy1 – the y coordinate of the first corner of the destination rectangle.
        dx2 – the x coordinate of the second corner of the destination rectangle.
        dy2 – the y coordinate of the second corner of the destination rectangle.
        sx1 – the x coordinate of the first corner of the source rectangle.
        sy1 – the y coordinate of the first corner of the source rectangle.
        sx2 – the x coordinate of the second corner of the source rectangle.
        sy2 – the y coordinate of the second corner of the source rectangle.
        observer – object to be notified as more of the image is scaled and converted.
    public abstract boolean drawImage(Image img,
                                      int dx1, int dy1, int dx2, int dy2,
                                      int sx1, int sy1, int sx2, int sy2,
                                      ImageObserver observer);

/**
* @author liTianLu
* @Date 2022/5/21 23:33
* @purpose 繪制背景
 * 提醒： 這里我寫了四種地圖的繪制，后面在選擇地圖時會用到。 
*/
public class BackGround {
    Graphics g;
    BufferedImage bufferedImage_1;
    BufferedImage bufferedImage_2;
    BufferedImage bufferedImage_3;
    BufferedImage bufferedImage_4;
    int w;
    int h;
    String fileName_1 = "src\\plane2\\z_img\\img_bg_1.jpg";   //地圖1
    String fileName_2 = "src\\plane2\\z_img\\img_bg_2.jpg";   //地圖2
    String fileName_3 = "src\\plane2\\z_img\\img_bg_3.jpg";   //地圖3
    String fileName_4 = "src\\plane2\\z_img\\img_bg_4.jpg";   //地圖4
    public BackGround(Graphics g) throws IOException {
        this.g = g;
        bufferedImage_1 = ImageIO.read(new File(fileName_1));
        bufferedImage_2 = ImageIO.read(new File(fileName_2));
        bufferedImage_3 = ImageIO.read(new File(fileName_3));
        bufferedImage_4 = ImageIO.read(new File(fileName_4));
        w = bufferedImage_1.getWidth();
        h = bufferedImage_1.getHeight();
    }
    /**
    * i ： 向下移動了i個像素
    * num : 用來控制繪制哪一個地圖
    */
    public void draw(int i , int num){ 
        switch(num){
            case 1 :
                g.drawImage(bufferedImage_1,0,i,w,i+h,0,0,w,h,null);
                g.drawImage(bufferedImage_1,0,0,w,i,0,h-i,w,h,null);
                break;
            case 2 :
                g.drawImage(bufferedImage_2,0,i,w,i+h,0,0,w,h,null);
                g.drawImage(bufferedImage_2,0,0,w,i,0,h-i,w,h,null);
                break;
            case 3 :
                g.drawImage(bufferedImage_3,0,i,w,i+h,0,0,w,h,null);
                g.drawImage(bufferedImage_3,0,0,w,i,0,h-i,w,h,null);
                break;
            case 4 :
                g.drawImage(bufferedImage_4,0,i,w,i+h,0,0,w,h,null);
                g.drawImage(bufferedImage_4,0,0,w,i,0,h-i,w,h,null);
                break;
        }
    }
    public int getH() {
        return h;
    }
}

backGround.draw(m, player.mapNum);
            m = m+2;
            if(m>= backGround.getH()){
                m = 0;
            }

//這里僅使用了三張圖片來回切換，更多的圖片會有更好的效果
public void draw(int i){    //此處的i是用來控制顯示哪一張圖片的
        int j = i%30; // 150ms換一張 
        if (j<10){
            g.drawImage(plane_img,x,y,x+sizeX,y+sizeY,0,0,sizeX,sizeY,null);
        }else if(j<20) {
            g.drawImage(plane_img,x,y,x+sizeX,y+sizeY,0,sizeY,sizeX,2*sizeY,null);
        }else if(j<30){
            g.drawImage(plane_img,x,y,x+sizeX,y+sizeY,288,0,424,112,null);
        }
    }

 @Override
        //鍵盤按壓時，設(shè)置速度
    public void keyPressed(KeyEvent e) {
        int c = e.getKeyCode();
        if(DrawThread.myPlane!=null){
            switch (c){
                case 37:
                    DrawThread.myPlane.setSpeedX(-speed);
                    break;
                case 38:
                    DrawThread.myPlane.setSpeedY(-speed);
                    break;
                case 39:
                    DrawThread.myPlane.setSpeedX(speed);
                    break;
                case 40:
                    DrawThread.myPlane.setSpeedY(speed);
                    break;
            }
        }
    }

@Override
        //鍵盤釋放時，速度設(shè)為0
    public void keyReleased(KeyEvent e) { 
        int c = e.getKeyCode();
        switch (c){
            case 37:
            case 39:
                DrawThread.myPlane.setSpeedX(0);
                break;
            case 38:
            case 40:
                DrawThread.myPlane.setSpeedY(0);
                break;
        }
    }

/**
* @author liTianLu
* @Date 2022/5/22 0:30
* @purpose 產(chǎn)生敵機的線程
*/
    @Override
    public void run() {
        int sleepTime  = 800;
        while (true){
            if(DrawThread.player.score>=500){  //當分數(shù)高于500時，加快敵機產(chǎn)生的頻率
                sleepTime = 300;
            }
            EnemyPlane enemyPlane = null;
            try {
                enemyPlane = new EnemyPlane();
            } catch (IOException e) {
                e.printStackTrace();
            }
            enemyPlanes.add(enemyPlane);
            new Thread(new EnemyBulletThread(enemyPlane)).start(); //啟動一個發(fā)射子彈線程
            try {
                sleep(sleepTime+ random.nextInt(300));
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

public EnemyBulletThread(EnemyPlane enemyPlane){
        this.enemyPlane = enemyPlane;
    }
    @Override
    public void run() {
        try {
            sleep(2000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        while(enemyPlane.isAlive() ){
            EnemyBullet enemyBullet = null;
            int enemyBullet_x = enemyPlane.getX()+25;
            int enemyBullet_y = enemyPlane.getY()+66;
            try {
                enemyBullet = new EnemyBullet(enemyBullet_x,enemyBullet_y);
            } catch (IOException e) {
                e.printStackTrace();
            }
            enemyBullets.add(enemyBullet);
            try {
                sleep(2000+ random.nextInt(2000));
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

synchronized (MyPlane.myBulletList){
    if(MyPlane.myBulletList.size()!=0){
        for (int i = 0; i < MyPlane.myBulletList.size(); i++) {
            MyPlane.myBulletList.get(i).setY(MyPlane.myBulletList.get(i).getY()+MyPlane.myBulletList.get(i).getSpeedY()    );

            if(MyPlane.myBulletList.get(i).getY() <= -100){
                MyPlane.myBulletList.remove(i);
                continue;
            }
        }
    }
}

synchronized (MyPlane.myBulletList){
    for (int i = 0; i < MyPlane.myBulletList.size(); i++) {
        for (int j = 0; j < EnemyPlaneThread.enemyPlanes.size() ;j++) {
            if(MyPlane.myBulletList.get(i).judge_crash(EnemyPlaneThread.enemyPlanes.get(j)) ){
                EnemyPlaneThread.enemyPlanes.get(j).setAlive(false);  //關(guān)線程
                DrawThread.player.score+=5; //分數(shù)+5
                EnemyPlaneThread.enemyPlanes.remove(j);
                MyPlane.myBulletList.remove(i);
                j = -1;
            }
            if(i >= MyPlane.myBulletList.size()){
                break;
            }
        }

    }
}