Java 游戏只点击一次按钮

Question

大家好，我正在编写一个 2D 游戏（马里奥克隆），我遇到了一个小问题：有没有办法消除这样一个事实，即如果我按下开火按钮并一直按住它，它就会开始产生数百万个火球？

非常感谢任何帮助，非常感谢。

编辑：代码

public void keyPressed(KeyEvent e){
    int key = e.getKeyCode();

    for (int i = 0; i < handler.object.size(); i++){
        GameObject tempObject = handler.object.get(i);

        if (tempObject.getId() == ObjectId.Player){
            if(key == KeyEvent.VK_D) tempObject.setVelX(5);
            if(key == KeyEvent.VK_A) tempObject.setVelX(-5);
            if(key == KeyEvent.VK_W && !tempObject.isJumping()) {
                tempObject.setJumping(true);
                tempObject.setVelY(-13);
            }
            if(key == KeyEvent.VK_SPACE){
                int velocity = tempObject.getLookingLR() * 5;
                float posX = tempObject.getX() + velocity;
                float posY =tempObject.getY()+32;
                handler.addObject(new Bullet(posX,posY, ObjectId.Bullet, velocity,handler));
                tempObject.setFiring(true);
            }
        }
    }

    if(key == KeyEvent.VK_ESCAPE){
        System.exit(1);
    }
}

Answer 1

你快搞定了。您实际上并没有检查玩家的对象以查看它是否在开火：

if(key == KeyEvent.VK_SPACE){
    int velocity = tempObject.getLookingLR() * 5;
    float posX = tempObject.getX() + velocity;
    float posY =tempObject.getY()+32;
    handler.addObject(new Bullet(posX,posY, ObjectId.Bullet, velocity,handler));
    tempObject.setFiring(true);
}

应该是：

if(key == KeyEvent.VK_SPACE && !tempObject.isFiring()){
    int velocity = tempObject.getLookingLR() * 5;
    float posX = tempObject.getX() + velocity;
    float posY =tempObject.getY()+32;
    handler.addObject(new Bullet(posX,posY, ObjectId.Bullet, velocity,handler));
    tempObject.setFiring(true);
}

您还需要添加一个 keyReleased 方法，将 firing 设置为 false:

public void keyReleased(KeyEvent e) {
    //your code for getting key event and finding the player Object

    if(key == KeyEvent.VK_SPACE) {
        //Do any necessary cleanup of the firing here
        tempObject.setFiring(false);
    }
}

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