用java写一个太空大战游戏

好的，我可以为你提供一个简单的太空大战游戏的Java代码，但需要注意的是，这只是一个简单的实现版本，如果你想要制作更加完整的游戏，需要进行更多的开发和优化。

首先，我们需要创建一个空的Java项目，然后创建以下类：

1. Game类：这是整个游戏的主类，包含游戏的主循环和其他必要的方法。
2. Player类：这个类表示玩家的飞船，包含位置、速度和其他属性。
3. Enemy类：这个类表示敌人的飞船，也包含位置、速度和其他属性。
4. Bullet类：这个类表示子弹，包含位置、速度和其他属性。

接下来是代码实现：

Game类：

import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import java.util.Random;

public class Game extends JPanel implements KeyListener, Runnable {

    private Player player;
    private ArrayList<Enemy> enemies;
    private ArrayList<Bullet> bullets;
    private Random random;

    private int score;
    private boolean gameOver;

    public Game() {
        setPreferredSize(new Dimension(800, 600));
        addKeyListener(this);
        setFocusable(true);

        player = new Player(400, 500);
        enemies = new ArrayList<>();
        bullets = new ArrayList<>();
        random = new Random();

        score = 0;
        gameOver = false;

        new Thread(this).start();
    }

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

        if (!gameOver) {
            // 绘制玩家飞船
            g.setColor(Color.BLUE);
            g.fillRect(player.getX(), player.getY(), player.getWidth(), player.getHeight());

            // 绘制敌人飞船
            g.setColor(Color.RED);
            for (Enemy enemy : enemies) {
                g.fillRect(enemy.getX(), enemy.getY(), enemy.getWidth(), enemy.getHeight());
            }

            // 绘制子弹
            g.setColor(Color.BLACK);
            for (Bullet bullet : bullets) {
                g.fillRect(bullet.getX(), bullet.getY(), bullet.getWidth(), bullet.getHeight());
            }

            // 绘制分数
            g.drawString("Score: " + score, 10, 20);
        } else {
            // 如果游戏结束，显示游戏结束的信息
            g.setColor(Color.RED);
            g.setFont(new Font("Arial", Font.BOLD, 48));
            g.drawString("Game Over!", 250, 300);
            g.setFont(new Font("Arial", Font.PLAIN, 24));
            g.drawString("Score: " + score, 350, 350);
        }
    }

    public void update() {
        if (!gameOver) {
            // 更新玩家飞船的位置
            player.update();

            // 更新敌人飞船的位置
            for (Enemy enemy : enemies) {
                enemy.update();
            }

            // 更新子弹的位置
            for (Bullet bullet : bullets) {
                bullet.update();
            }

            // 检测子弹是否击中敌人飞船
            for (int i = 0; i < bullets.size(); i++) {
                Bullet bullet = bullets.get(i);
                for (int j = 0; j < enemies.size(); j++) {
                    Enemy enemy = enemies.get(j);
                    if (bullet.intersects(enemy)) {
                        bullets.remove(i);
                        i--;
                        enemies.remove(j);
                        j--;
                        score += 10;
                    }
                }
            }

            // 检测敌人飞船是否撞到玩家飞船
            for (Enemy enemy : enemies) {
                if (enemy.intersects(player)) {
                    gameOver = true;
                    break;
                }
            }

            // 添加新的敌人飞船
            if (random.nextInt(100) < 5) {
                enemies.add(new Enemy(random.nextInt(800), 0));
            }

            // 删除移出边界的子弹和敌人飞船
            for (int i = 0; i < bullets.size(); i++) {
                Bullet bullet = bullets.get(i);
                if (bullet.getY() < 0 || bullet.getY() > 600) {
                    bullets.remove(i);
                    i--;
                }
            }
            for (int i = 0; i < enemies.size(); i++) {
                Enemy enemy = enemies.get(i);
                if (enemy.getY() > 600) {
                    enemies.remove(i);
                    i--;
                }
            }
        }
    }

    public void keyPressed(KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_LEFT) {
            player.setVelocityX(-5);
        }
        if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
            player.setVelocityX(5);
        }
        if (e.getKeyCode() == KeyEvent.VK_SPACE) {
            bullets.add(new Bullet(player.getX() + player.getWidth() / 2 - 2, player.getY() - 10));
        }
    }

    public void keyReleased(KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_LEFT || e.getKeyCode() == KeyEvent.VK_RIGHT) {
            player.setVelocityX(0);
        }
    }

    public void keyTyped(KeyEvent e) {}

    public void run() {
        while (true) {
            update();
            repaint();
            try {
                Thread.sleep(20);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Space War");
        Game game = new Game();
        frame.add(game);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

}

Player类：

public class Player {

    private int x;
    private int y;
    private int width;
    private int height;
    private int velocityX;

    public Player(int x, int y) {
        this.x = x;
        this.y = y;
        width = 40;
        height = 40;
        velocityX = 0;
    }

    public void update() {
        x += velocityX;
        if (x < 0) {
            x = 0;
        }
        if (x + width > 800) {
            x = 800 - width;
        }
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public int getWidth() {
        return width;
    }

    public int getHeight() {
        return height;
    }

    public void setVelocityX(int velocityX) {
        this.velocityX = velocityX;
    }

}

Enemy类：

public class Enemy {

    private int x;
    private int y;
    private int width;
    private int height;
    private int velocityX;
    private int velocityY;

    public Enemy(int x, int y) {
        this.x = x;
        this.y = y;
        width = 40;
        height = 40;
        velocityX = 0;
        velocityY = 2;
    }

    public void update() {
        x += velocityX;
        y += velocityY;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public int getWidth() {
        return width;
    }

    public int getHeight() {
        return height;
    }

    public boolean intersects(Player player) {
        return x < player.getX() + player.getWidth() &&
                x + width > player.getX() &&
                y < player.getY() + player.getHeight() &&
                y + height > player.getY();
    }

}

Bullet类：

public class Bullet {

    private int x;
    private int y;
    private int width;
    private int height;
    private int velocityX;
    private int velocityY;

    public Bullet(int x, int y) {
        this.x = x;
        this.y = y;
        width = 4;
        height = 10;
        velocityX = 0;
        velocityY = -10;
    }

    public void update() {
        x += velocityX;
        y += velocityY;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public int getWidth() {
        return width;
    }

    public int getHeight() {
        return height;
    }

    public boolean intersects(Enemy enemy) {
        return x < enemy.getX() + enemy.getWidth() &&
                x + width > enemy.getX() &&
                y < enemy.getY() + enemy.getHeight() &&
                y + height > enemy.getY();
    }

}

这就是一个简单的太空大战游戏的Java代码，希望能对你有所帮助！