用java代码写一个塔防游戏

好的，下面是一个基本的塔防游戏的Java代码示例：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.ArrayList;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class TowerDefense extends JPanel implements Runnable, MouseListener {

    private static final long serialVersionUID = 1L;

    private static final int WIDTH = 800;
    private static final int HEIGHT = 600;

    private boolean running = false;

    private Image bgImage;
    private Image enemyImage;
    private Image towerImage;
    private ArrayList<Enemy> enemies = new ArrayList<Enemy>();
    private ArrayList<Tower> towers = new ArrayList<Tower>();

    public TowerDefense() {
        setBackground(Color.WHITE);
        setDoubleBuffered(true);
        addMouseListener(this);

        bgImage = new ImageIcon(getClass().getResource("background.png")).getImage();
        enemyImage = new ImageIcon(getClass().getResource("enemy.png")).getImage();
        towerImage = new ImageIcon(getClass().getResource("tower.png")).getImage();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Tower Defense");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(WIDTH, HEIGHT);
        frame.setResizable(false);
        frame.setLocationRelativeTo(null);

        TowerDefense game = new TowerDefense();
        frame.add(game);

        frame.setVisible(true);

        game.start();
    }

    public synchronized void start() {
        running = true;
        new Thread(this).start();
    }

    public synchronized void stop() {
        running = false;
    }

    public void run() {
        while (running) {
            update();
            repaint();

            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private void update() {
        // Add new enemies every 100 frames
        if (GameFrame.getFrameCount() % 100 == 0) {
            enemies.add(new Enemy(enemyImage, WIDTH, HEIGHT));
        }

        // Update enemies
        for (int i = 0; i < enemies.size(); i++) {
            Enemy enemy = enemies.get(i);
            enemy.update();

            // If an enemy reaches the end, remove it and subtract a life
            if (enemy.getX() == 0) {
                enemies.remove(i);
                GameFrame.subtractLife();
            }
        }

        // Update towers
        for (Tower tower : towers) {
            tower.update(enemies);
        }
    }

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

        g.drawImage(bgImage, 0, 0, null);

        // Draw enemies
        for (Enemy enemy : enemies) {
            enemy.draw(g);
        }

        // Draw towers
        for (Tower tower : towers) {
            tower.draw(g);
        }
    }

    public void mouseClicked(MouseEvent e) {
        Tower tower = new Tower(towerImage, e.getX(), e.getY());
        towers.add(tower);
    }

    public void mousePressed(MouseEvent e) {}

    public void mouseReleased(MouseEvent e) {}

    public void mouseEntered(MouseEvent e) {}

    public void mouseExited(MouseEvent e) {}

    public Dimension getPreferredSize() {
        return new Dimension(WIDTH, HEIGHT);
    }

}

上面的代码只是一个基本的框架，还需要实现一些其他的类和方法。你可以根据需要自己添加或修改代码。

上面的代码中，`Enemy`类表示敌人，`Tower`类表示防御塔。`GameFrame`类是一个静态类，用于计算游戏的帧数和减少生命值。`background.png`、`enemy.png`和`tower.png`是游戏需要的图像文件。

如果你想要了解更多关于Java游戏开发的知识，可以参考Java游戏开发的相关书籍或文档。