写一个飞机大战的Java代码

以下是一个简单的飞机大战的Java代码示例：

import java.awt.*;
import java.awt.event.*;

public class PlaneGame extends Frame {
    private Plane plane = new Plane(250, 250); // 创建飞机对象
    private Image offScreenImage = null; // 双缓冲技术相关
    private Graphics gOffScreen = null; // 双缓冲技术相关

    public void launchFrame() {
        setSize(500, 500);
        setLocation(100, 100);
        setVisible(true);

        // 添加键盘监听器，控制飞机移动
        addKeyListener(new KeyMonitor());

        // 使用线程不断重画窗口
        new Thread(new PaintThread()).start();
    }

    public void paint(Graphics g) {
        // 绘制背景
        Color c = g.getColor();
        g.setColor(Color.GRAY);
        g.fillRect(0, 0, 500, 500);
        g.setColor(c);

        // 绘制飞机
        plane.draw(g);
    }

    public void update(Graphics g) {
        if (offScreenImage == null) {
            offScreenImage = this.createImage(500, 500);
            gOffScreen = offScreenImage.getGraphics();
        }
        paint(gOffScreen);
        g.drawImage(offScreenImage, 0, 0, null);
    }

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

    private class PaintThread implements Runnable {
        public void run() {
            while (true) {
                repaint(); // 重画窗口
                try {
                    Thread.sleep(40); // 休眠40ms，约每秒25帧
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    private class KeyMonitor extends KeyAdapter {
        public void keyPressed(KeyEvent e) {
            plane.addDirection(e);
        }

        public void keyReleased(KeyEvent e) {
            plane.minusDirection(e);
        }
    }

    private class Plane {
        private int x, y; // 飞机的坐标
        private boolean left, right, up, down; // 飞机的移动方向

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

        public void draw(Graphics g) {
            Color c = g.getColor();
            g.setColor(Color.YELLOW);
            g.fillOval(x, y, 10, 10);
            g.setColor(c);

            move();
        }

        public void move() {
            if (left) {
                x -= 3;
            }
            if (right) {
                x += 3;
            }
            if (up) {
                y -= 3;
            }
            if (down) {
                y += 3;
            }
        }

        public void addDirection(KeyEvent e) {
            switch (e.getKeyCode()) {
                case KeyEvent.VK_LEFT:
                    left = true;
                    break;
                case KeyEvent.VK_RIGHT:
                    right = true;
                    break;
                case KeyEvent.VK_UP:
                    up = true;
                    break;
                case KeyEvent.VK_DOWN:
                    down = true;
                    break;
            }
        }

        public void minusDirection(KeyEvent e) {
            switch (e.getKeyCode()) {
                case KeyEvent.VK_LEFT:
                    left = false;
                    break;
                case KeyEvent.VK_RIGHT:
                    right = false;
                    break;
                case KeyEvent.VK_UP:
                    up = false;
                    break;
                case KeyEvent.VK_DOWN:
                    down = false;
                    break;
            }
        }
    }
}

这个代码创建了一个简单的窗口，其中包含一个飞机对象和键盘监听器来控制飞机的移动。每40毫秒重画窗口，使飞机看起来移动起来。运行该代码，你可以使用键盘的方向键来控制飞机的移动。请注意，这只是一个简单的示例，你可以根据需求进行扩展和修改。