用java写一个飞机大战的游戏

这里是一个基于Java Swing的简单飞机大战游戏的示例代码，仅供参考：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;

public class PlaneGame extends JFrame {
    // 窗口大小
    private static final int FRAME_WIDTH = 480;
    private static final int FRAME_HEIGHT = 700;
    // 飞机移动速度
    private static final int PLANE_SPEED = 8;
    // 子弹速度
    private static final int BULLET_SPEED = 20;
    // 敌机生成速度
    private static final int ENEMY_PLANE_INTERVAL = 100;
    // 敌机移动速度
    private static final int ENEMY_PLANE_SPEED = 5;
    // 分数
    private int score = 0;
    // 飞机图片
    private Image planeImage;
    // 子弹图片
    private Image bulletImage;
    // 敌机图片
    private Image enemyPlaneImage;
    // 爆炸图片
    private Image boomImage;
    // 飞机坐标
    private int planeX;
    private int planeY;
    // 飞机状态
    private boolean planeAlive = true;
    // 子弹列表
    private ArrayList<Bullet> bulletList = new ArrayList<>();
    // 敌机列表
    private ArrayList<EnemyPlane> enemyPlaneList = new ArrayList<>();

    public PlaneGame() {
        // 设置标题
        setTitle("Plane Game");
        // 设置窗口大小
        setSize(FRAME_WIDTH, FRAME_HEIGHT);
        // 设置窗口不可调整大小
        setResizable(false);
        // 居中显示窗口
        setLocationRelativeTo(null);
        // 关闭窗口时退出程序
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // 添加键盘监听器
        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                // 获取键盘按下的键
                int keyCode = e.getKeyCode();
                // 根据按键移动飞机
                if (keyCode == KeyEvent.VK_LEFT) {
                    planeX -= PLANE_SPEED;
                } else if (keyCode == KeyEvent.VK_RIGHT) {
                    planeX += PLANE_SPEED;
                } else if (keyCode == KeyEvent.VK_UP) {
                    planeY -= PLANE_SPEED;
                } else if (keyCode == KeyEvent.VK_DOWN) {
                    planeY += PLANE_SPEED;
                } else if (keyCode == KeyEvent.VK_SPACE) {
                    // 发射子弹
                    Bullet bullet = new Bullet(planeX + planeImage.getWidth(null) / 2 - bulletImage.getWidth(null) / 2, planeY - bulletImage.getHeight(null));
                    bulletList.add(bullet);
                }
            }
        });
        // 加载图片
        planeImage = new ImageIcon("plane.png").getImage();
        bulletImage = new ImageIcon("bullet.png").getImage();
        enemyPlaneImage = new ImageIcon("enemy_plane.png").getImage();
        boomImage = new ImageIcon("boom.png").getImage();
        // 初始化飞机坐标
        planeX = FRAME_WIDTH / 2 - planeImage.getWidth(null) / 2;
        planeY = FRAME_HEIGHT - planeImage.getHeight(null) - 50;
        // 开始游戏循环
        startGameLoop();
        // 显示窗口
        setVisible(true);
    }

    // 开始游戏循环
    private void startGameLoop() {
        // 创建游戏循环线程
        Thread gameLoopThread = new Thread(() -> {
            while (true) {
                try {
                    // 生成敌机
                    if (Math.random() * ENEMY_PLANE_INTERVAL < 1) {
                        EnemyPlane enemyPlane = new EnemyPlane((int) (Math.random() * (FRAME_WIDTH - enemyPlaneImage.getWidth(null))), -enemyPlaneImage.getHeight(null));
                        enemyPlaneList.add(enemyPlane);
                    }
                    // 移动子弹
                    for (int i = bulletList.size() - 1; i >= 0; i--) {
                        Bullet bullet = bulletList.get(i);
                        bullet.y -= BULLET_SPEED;
                        // 判断子弹是否击中敌机
                        for (int j = enemyPlaneList.size() - 1; j >= 0; j--) {
                            EnemyPlane enemyPlane = enemyPlaneList.get(j);
                            if (bullet.x >= enemyPlane.x && bullet.x <= enemyPlane.x + enemyPlaneImage.getWidth(null) && bullet.y >= enemyPlane.y && bullet.y <= enemyPlane.y + enemyPlaneImage.getHeight(null)) {
                                // 击中敌机，移除子弹和敌机，并增加分数
                                bulletList.remove(i);
                                enemyPlaneList.remove(j);
                                score += 10;
                                break;
                            }
                        }
                        // 移除越界的子弹
                        if (bullet.y < -bulletImage.getHeight(null)) {
                            bulletList.remove(i);
                        }
                    }
                    // 移动敌机
                    for (int i = enemyPlaneList.size() - 1; i >= 0; i--) {
                        EnemyPlane enemyPlane = enemyPlaneList.get(i);
                        enemyPlane.y += ENEMY_PLANE_SPEED;
                        // 判断敌机是否撞击到飞机
                        if (enemyPlane.x + enemyPlaneImage.getWidth(null) >= planeX && enemyPlane.x <= planeX + planeImage.getWidth(null) && enemyPlane.y + enemyPlaneImage.getHeight(null) >= planeY && enemyPlane.y <= planeY + planeImage.getHeight(null)) {
                            // 撞击到飞机，游戏结束
                            planeAlive = false;
                            break;
                        }
                        // 移除越界的敌机
                        if (enemyPlane.y > FRAME_HEIGHT) {
                            enemyPlaneList.remove(i);
                        }
                    }
                    // 重绘窗口
                    repaint();
                    // 等待一段时间
                    Thread.sleep(30);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });
        // 启动游戏循环线程
        gameLoopThread.start();
    }

    @Override
    public void paint(Graphics g) {
        // 创建双缓冲图像
        Image doubleBufferImage = createImage(getWidth(), getHeight());
        Graphics doubleBufferGraphics = doubleBufferImage.getGraphics();
        // 绘制背景
        doubleBufferGraphics.setColor(Color.WHITE);
        doubleBufferGraphics.fillRect(0, 0, getWidth(), getHeight());
        // 绘制分数
        doubleBufferGraphics.setColor(Color.BLACK);
        doubleBufferGraphics.setFont(new Font("微软雅黑", Font.BOLD, 20));
        doubleBufferGraphics.drawString("分数：" + score, 20, 40);
        // 绘制飞机
        if (planeAlive) {
            doubleBufferGraphics.drawImage(planeImage, planeX, planeY, null);
        } else {
            doubleBufferGraphics.drawImage(boomImage, planeX, planeY, null);
            doubleBufferGraphics.setColor(Color.RED);
            doubleBufferGraphics.setFont(new Font("微软雅黑", Font.BOLD, 40));
            doubleBufferGraphics.drawString("游戏结束", FRAME_WIDTH / 2 - 100, FRAME_HEIGHT / 2);
        }
        // 绘制子弹
        for (Bullet bullet : bulletList) {
            doubleBufferGraphics.drawImage(bulletImage, bullet.x, bullet.y, null);
        }
        // 绘制敌机
        for (EnemyPlane enemyPlane : enemyPlaneList) {
            doubleBufferGraphics.drawImage(enemyPlaneImage, enemyPlane.x, enemyPlane.y, null);
        }
        // 绘制双缓冲图像到窗口
        g.drawImage(doubleBufferImage, 0, 0, null);
    }

    // 子弹类
    private static class Bullet {
        int x;
        int y;

        public Bullet(int x, int y) {
            this.x = x;
            this.y = y;
        }
    }

    // 敌机类
    private static class EnemyPlane {
        int x;
        int y;

        public EnemyPlane(int x, int y) {
            this.x = x;
            this.y = y;
        }
    }

    public static void main(String[] args) {
        new PlaneGame();
    }
}

注意：这个示例代码只是一个简单的飞机大战游戏，还有很多需要完善和优化的地方，比如增加多种敌机、道具、关卡等。