MouseListener似乎不适合我 [英] MouseListener doesn't appear to be working for me

问题描述

我需要在我的导师的序言中不要让我们使用IDE。我们使用TextPad。我想点击这个标签，然后从H变为T。目前，当我点击标签什么也没做。我忘了什么？

I need to preface this with my instructor doesn't let us use IDE's. We use TextPad. I want to click on this label and it then change from "H" to "T". Currently when I click the label does nothing. What am I forgetting?

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


public class Lab3Label extends JLabel implements MouseListener {
    int count = 0;
    boolean flag = true;

    public Lab3Label (int i) {
        setLayout(new BorderLayout());
        count = i;
        this.setText("H");
        this.setFont(new Font("Serif", Font.PLAIN, 60));
        this.setBorder(BorderFactory.createLineBorder(Color.black));
    }

    public void mouseReleased(MouseEvent e)
        {

            if(flag){
                this.setText("H");
                flag = false;
            }

            else{
                this.setText("T");
                flag = true;
            }
        }

    public void mouseExited(MouseEvent e){}
    public void mouseClicked(MouseEvent e){}
    public void mousePressed(MouseEvent e){}
    public void mouseMoved(MouseEvent e){}
    public void mouseEntered(MouseEvent e){}


}

推荐答案

您的 JLabel 实现 MouseListener ，但您还需要告诉 JLabel 将事件发送给自己。在构造函数的末尾，你需要说

Your JLabel implements MouseListener, but you also need to tell the JLabel to send events to itself. At the end of the constructor you'll need to say

addMouseListener(this);

如果你记得你可以将任何类变成一个 MouseListener ，你必须将你的监听器连接到 JLabel 。 JLabel 是其自己的监听器这一事实并不能免除您的责任。

This makes more sense if you remember that you can make any class into a MouseListener, and you'd have to connect your listener to your JLabel. The fact that the JLabel is its own listener doesn't absolve you of this responsibility.

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