用java实现坦克大战

坦克大战是一款经典的游戏，使用Java实现也是可行的。下面是一个简单的Java实现坦克大战的示例代码：

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

public class TankGame extends JFrame {

    private Tank tank;
    private Missile missile;

    public TankGame() {
        this.setSize(500, 500);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.addKeyListener(new KeyMonitor());
        tank = new Tank(50, 50);
        missile = new Missile(tank.x, tank.y, tank.dir);
    }

    public void paint(Graphics g) {
        super.paint(g);
        tank.draw(g);
        missile.draw(g);
    }

    class KeyMonitor extends KeyAdapter {

        public void keyPressed(KeyEvent e) {
            tank.moving = true;

            switch(e.getKeyCode()) {
                case KeyEvent.VK_UP:
                    tank.dir = Dir.UP;
                    break;
                case KeyEvent.VK_DOWN:
                    tank.dir = Dir.DOWN;
                    break;
                case KeyEvent.VK_LEFT:
                    tank.dir = Dir.LEFT;
                    break;
                case KeyEvent.VK_RIGHT:
                    tank.dir = Dir.RIGHT;
                    break;
            }
        }

        public void keyReleased(KeyEvent e) {
            tank.moving = false;
        }
    }

    class Tank {

        public static final int SPEED = 5;
        public int x, y;
        public boolean moving = false;
        public Dir dir = Dir.DOWN;

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

        public void draw(Graphics g) {
            g.fillRect(x, y, 30, 30);

            if (moving) {
                switch (dir) {
                    case UP:
                        y -= SPEED;
                        break;
                    case DOWN:
                        y += SPEED;
                        break;
                    case LEFT:
                        x -= SPEED;
                        break;
                    case RIGHT:
                        x += SPEED;
                        break;
                }
            }
        }
    }

    class Missile {

        public static final int SPEED = 10;
        public int x, y;
        public Dir dir;

        public Missile(int x, int y, Dir dir) {
            this.x = x;
            this.y = y;
            this.dir = dir;
        }

        public void draw(Graphics g) {
            g.setColor(Color.RED);
            g.fillOval(x, y, 10, 10);

            switch (dir) {
                case UP:
                    y -= SPEED;
                    break;
                case DOWN:
                    y += SPEED;
                    break;
                case LEFT:
                    x -= SPEED;
                    break;
                case RIGHT:
                    x += SPEED;
                    break;
            }
        }
    }

    enum Dir {
        UP,
        DOWN,
        LEFT,
        RIGHT
    }

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

这个示例程序中，我们实现了一个可以用方向键控制移动的坦克，以及一个可以沿着坦克方向移动的导弹。你可以在这个基础上增加更多功能，比如增加敌人坦克、增加障碍物、增加爆炸效果等等。