Question

我有一个Java GUI代码，它在JPanel中使用多个JLabel。每个单独的JLabel都有一个独特的鼠标监听器，在单击JLabel时会调用它。出于某种原因，当单击一个JLabel时，它们都被调用。

以下是JLabel：

car1 = new JLabel(card1); //card1 is just an image icon, no problems there
car2 = new JLabel(card2);
car3 = new JLabel(card3);

鼠标听众：

car1.addMouseListener(new CardGUI("/cards/aceclubsS.gif", car1)); //Sends the path of the new card to be implemented as a JLabel as well as the current JLabel clicked.
car2.addMouseListener(new CardGUI("/cards/aceheartsS.gif", car2));
car3.addMouseListener(new CardGUI("/cards/acespadesS.gif", car3));

CardGUI课程：

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

public class CardGUI extends JFrame implements MouseListener
{
    // instance variables - replace the example below with your own
    private static JLabel called;
    private static JLabel current;
    private static String tmp;
    private static JLabel temp;
    /**
     * Constructor for objects of class CardGUI
     */
    public CardGUI(String path, JLabel cur)
    {
        temp = cur;
        tmp = path;
    }
    public void mouseExited(MouseEvent e)
    {
        current = null;
        called = null;
    }
    public void mouseEntered(MouseEvent e)
    {
        current = null;
        called = null;
    }
    public void mousePressed(MouseEvent e)
    {
        current = null;
        called = null;
    }
    public void mouseReleased(MouseEvent e)
    {
        current = null;
        called = null;
    }
    public void mouseClicked(MouseEvent e)
    {
        ImageIcon ic = GameGUI.createImageIcon(tmp, "");
        called = new JLabel(ic);
        current = temp;
        GameGUI.replace(current, called);
    }
    public static JLabel getCalled()
    {
        return called;
    }
    public static JLabel getCurrent()
    {
        return current;
    }
}

原始类中的replace方法：

public static void replace(JLabel jl1, JLabel jl2)
    {
        JLabel calledr = jl2;
        p2.remove(jl1);
        p2.add(calledr);
        p2.revalidate();
        p2.repaint();
    } //p2 is the panel all of the JLabels are in

提前致谢！

Answer 1

您的CardGUI类仅使用静态变量。静态变量只存在于该类的所有instatnce一次。所以

CardGUI one=new CardGUI("Path", label1)
CardGUI two=new CardGUI("otherPath", label2)

一个和两个共享相同的tmp，temp，called，current变量。因此，在第2行中，您将覆盖第1行中的label1。取决于您的显示，更新，您正在显示的符号或所有听众的路径也是相同的。

招呼 reineke

编辑：

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

public class CardGUI extends JFrame implements MouseListener
{
    // instance variables - replace the example below with your own
    private JLabel called;
    private JLabel current;
    private String tmp;
    private JLabel temp;
    /**
     * Constructor for objects of class CardGUI
     */
    public CardGUI(String path, JLabel cur)
    {
        temp = cur;
        tmp = path;
    }
    public void mouseExited(MouseEvent e)
    {
        current = null;
        called = null;
    }
    public void mouseEntered(MouseEvent e)
    {
        current = null;
        called = null;
    }
    public void mousePressed(MouseEvent e)
    {
        current = null;
        called = null;
    }
    public void mouseReleased(MouseEvent e)
    {
        current = null;
        called = null;
    }
    public void mouseClicked(MouseEvent e)
    {
        ImageIcon ic = GameGUI.createImageIcon(tmp, "");
        called = new JLabel(ic);
        current = temp;
        GameGUI.replace(current, called);
    }
    public static JLabel getCalled()
    {
        return called;
    }
    public static JLabel getCurrent()
    {
        return current;
    }
}

这应该可以正常工作

当一个JPanel中的一个鼠标监听器被调用时，它们都被调用了？

1 个答案:

编辑：