用java写一个飞机大战

好的，以下是一个简单的飞机大战游戏的 Java 代码示例：

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

public class PlaneWar extends JFrame {
    private MyPanel myPanel = null;

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

    public PlaneWar() {
        myPanel = new MyPanel();
        this.add(myPanel);
        this.setSize(400, 600);
        this.setTitle("PlaneWar");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
    }

    class MyPanel extends JPanel {
        private ImageIcon background = new ImageIcon("background.jpg");
        private ImageIcon planeIcon = new ImageIcon("plane.png");
        private ImageIcon bulletIcon = new ImageIcon("bullet.png");
        private int planeX = 175, planeY = 500;
        private int bulletX = planeX + 30, bulletY = planeY - 20;
        private boolean isFiring = false;

        public void paint(Graphics g) {
            super.paint(g);

            // 绘制背景
            g.drawImage(background.getImage(), 0, 0, null);

            // 绘制玩家飞机
            g.drawImage(planeIcon.getImage(), planeX, planeY, null);

            // 绘制子弹
            if (isFiring) {
                g.drawImage(bulletIcon.getImage(), bulletX, bulletY, null);
            }
        }

        public MyPanel() {
            // 添加键盘监听器
            this.addKeyListener(new KeyAdapter() {
                public void keyPressed(KeyEvent e) {
                    int code = e.getKeyCode();
                    switch (code) {
                        case KeyEvent.VK_LEFT:
                            if (planeX > 0) planeX -= 10;
                            break;
                        case KeyEvent.VK_RIGHT:
                            if (planeX < 340) planeX += 10;
                            break;
                        case KeyEvent.VK_SPACE:
                            if (!isFiring) {
                                isFiring = true;
                                bulletX = planeX + 30;
                                bulletY = planeY - 20;
                                // 开始子弹线程
                                new BulletThread().start();
                            }
                            break;
                    }
                    repaint();
                }
            });

            // 设置焦点
            this.setFocusable(true);
        }

        class BulletThread extends Thread {
            public void run() {
                while (isFiring) {
                    bulletY -= 10;
                    if (bulletY < -bulletIcon.getIconHeight()) {
                        isFiring = false;
                        break;
                    }
                    try {
                        Thread.sleep(30);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    repaint();
                }
            }
        }
    }
}

这个游戏非常简单，只有一个玩家飞机和子弹。玩家可以使用左右箭头控制飞机移动，使用空格键开火。子弹线程会不断更新子弹的位置，当子弹飞出屏幕时，线程会结束。