如何用Java写一个飞机大战的小游戏

飞机大战是一种基于2D图形和键盘事件的小游戏，下面是一个使用Java编写的简单飞机大战游戏的代码示例：

1. 创建游戏窗口

import javax.swing.JFrame;

public class GameFrame extends JFrame {
    public GameFrame() {
        setTitle("飞机大战");
        setSize(400, 600);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setResizable(false);
        setVisible(true);
    }

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

2. 创建游戏画布并绘制背景

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import javax.swing.JPanel;

public class GamePanel extends JPanel {
    private Image bgImage;

    public GamePanel() {
        bgImage = Toolkit.getDefaultToolkit().getImage("bg.png");
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(bgImage, 0, 0, getWidth(), getHeight(), null);
        g.setColor(Color.WHITE);
        g.drawString("Hello, world!", getWidth() / 2 - 50, getHeight() / 2);
    }
}

3. 添加键盘监听器

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;

public class GameFrame extends JFrame implements KeyListener {
    private GamePanel gamePanel;

    public GameFrame() {
        setTitle("飞机大战");
        setSize(400, 600);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setResizable(false);

        gamePanel = new GamePanel();
        add(gamePanel);

        addKeyListener(this);
        setFocusable(true);
        setVisible(true);
    }

    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();
        switch (keyCode) {
            case KeyEvent.VK_LEFT:
                System.out.println("向左移动");
                break;
            case KeyEvent.VK_RIGHT:
                System.out.println("向右移动");
                break;
            case KeyEvent.VK_SPACE:
                System.out.println("发射子弹");
                break;
        }
    }

    @Override
    public void keyReleased(KeyEvent e) {}

    @Override
    public void keyTyped(KeyEvent e) {}
}

4. 添加飞机和子弹

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JPanel;

public class GamePanel extends JPanel implements KeyListener {
    private Image bgImage;
    private Plane plane;
    private List<Bullet> bullets;

    public GamePanel() {
        bgImage = Toolkit.getDefaultToolkit().getImage("bg.png");
        plane = new Plane(getWidth() / 2, getHeight() - 100);
        bullets = new ArrayList<>();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(bgImage, 0, 0, getWidth(), getHeight(), null);
        plane.draw(g);
        for (Bullet bullet : bullets) {
            bullet.draw(g);
        }
    }

    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();
        switch (keyCode) {
            case KeyEvent.VK_LEFT:
                plane.moveLeft();
                break;
            case KeyEvent.VK_RIGHT:
                plane.moveRight(getWidth());
                break;
            case KeyEvent.VK_SPACE:
                bullets.add(new Bullet(plane.getX(), plane.getY()));
                break;
        }
        repaint();
    }

    @Override
    public void keyReleased(KeyEvent e) {}

    @Override
    public void keyTyped(KeyEvent e) {}

    private static class Plane {
        private int x, y;
        private final int speed = 5;

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

        public void moveLeft() {
            x -= speed;
        }

        public void moveRight(int maxWidth) {
            x += speed;
            if (x > maxWidth) {
                x = maxWidth;
            }
        }

        public int getX() {
            return x;
        }

        public int getY() {
            return y;
        }

        public void draw(Graphics g) {
            g.setColor(Color.RED);
            g.drawRect(x - 25, y - 25, 50, 50);
        }
    }

    private static class Bullet {
        private int x, y;
        private final int speed = 10;

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

        public void move() {
            y -= speed;
        }

        public int getX() {
            return x;
        }

        public int getY() {
            return y;
        }

        public void draw(Graphics g) {
            g.setColor(Color.YELLOW);
            g.fillOval(x - 5, y - 5, 10, 10);
        }
    }
}

这只是一个简单的示例代码，您可以根据需求对代码进行修改和扩展。