java - MouseListener 在 JLabel 中不起作用

Question

我正在编写游戏，我的项目结构如下:

我们有一个抽象类，所有其他类都继承自它。

    public abstract class Bird extends JLabel implements MouseListener {
        private static final long serialVersionUID = 1L;

        private int M_weight;
        private int M_radius;
        private long M_bornTime;
        private int M_maxBirdPower;
        private BirdState M_birdState;
        private boolean B_prepareToShoot;

        public Bird(int weight, int radius, long bornTime, int maxBirdPower,
                BirdState birdState) {
            this.M_weight = weight;
            this.M_radius = radius;
            this.M_bornTime = bornTime;
            this.M_maxBirdPower = maxBirdPower;
            this.M_birdState = birdState;
            this.B_prepareToShoot = false;
            this.addMouseListener(this);
        }

        public BirdState getBirdState() {
            return M_birdState;
        }
    }

还有一些类，如RedBird，继承自Bird类并实现了抽象函数。

    public class RedBird extends Bird {
        private static final long serialVersionUID = 1L;

        public RedBird(int weight, int radius, long bornTime, int maxBirdPower,
                BirdState birdState) {
            super(weight, radius, bornTime, maxBirdPower, birdState);
        }

        @Override
        public void mouseClicked(MouseEvent arg0) {
                System.out.println("Clicked");
        }

        @Override
        public void mouseEntered(MouseEvent arg0) {
        }

        @Override
        public void mouseExited(MouseEvent arg0) {
        }

        @Override
        public void mousePressed(MouseEvent arg0) {
        }

        @Override
        public void mouseReleased(MouseEvent arg0) {
        }
    }

我在 JPanel 中添加了 RedBird 类的一个对象，但是当我单击该对象时，MouseListener 不起作用。问题是什么 ？谁能给我一个解决方案吗？

提前致谢:)

Answer 1

您尚未将鼠标监听器“添加”到任何 JComponent。这就是它不起作用的原因。 在 Bird 类的构造函数中添加以下代码:

this.addMousListener(this);