用Java语言写一个飞机大战游戏

好的，以下是一个简单的飞机大战游戏的Java代码：

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

public class PlaneGame extends JFrame implements ActionListener, KeyListener {
    private int x, y, bx, by;
    private ImageIcon planeIcon, bulletIcon, bgIcon;
    private Timer timer;
    private boolean left, right, up, down, fire;

    public PlaneGame() {
        setTitle("Plane Game");
        setSize(500, 600);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setResizable(false);
        setVisible(true);
        setLayout(null);

        x = 220;
        y = 500;
        bx = x + 25;
        by = y - 25;

        planeIcon = new ImageIcon("plane.png");
        bulletIcon = new ImageIcon("bullet.png");
        bgIcon = new ImageIcon("bg.jpg");

        timer = new Timer(10, this);
        timer.start();

        addKeyListener(this);
    }

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

        g.drawImage(bgIcon.getImage(), 0, 0, null);
        g.drawImage(planeIcon.getImage(), x, y, null);

        if (fire) {
            g.drawImage(bulletIcon.getImage(), bx, by, null);
            by -= 5;
            if (by < 0) {
                fire = false;
                bx = x + 25;
                by = y - 25;
            }
        }
    }

    public void actionPerformed(ActionEvent e) {
        if (left) x -= 5;
        if (right) x += 5;
        if (up) y -= 5;
        if (down) y += 5;
        if (x < 0) x = 0;
        if (x > 450) x = 450;
        if (y < 30) y = 30;
        if (y > 500) y = 500;
        repaint();
    }

    public void keyPressed(KeyEvent e) {
        int code = e.getKeyCode();
        if (code == KeyEvent.VK_LEFT) left = true;
        if (code == KeyEvent.VK_RIGHT) right = true;
        if (code == KeyEvent.VK_UP) up = true;
        if (code == KeyEvent.VK_DOWN) down = true;
        if (code == KeyEvent.VK_SPACE) fire = true;
    }

    public void keyReleased(KeyEvent e) {
        int code = e.getKeyCode();
        if (code == KeyEvent.VK_LEFT) left = false;
        if (code == KeyEvent.VK_RIGHT) right = false;
        if (code == KeyEvent.VK_UP) up = false;
        if (code == KeyEvent.VK_DOWN) down = false;
    }

    public void keyTyped(KeyEvent e) {}

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

这个游戏只有一个玩家控制一个飞机，并且可以发射子弹。如果需要更加复杂的游戏玩法，需要进一步完善代码。