Question

由于我之前的帖子很乱，我决定重新发布，但希望这次更清洁。

所以这是我正在尝试使用的代码：

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

public class sample extends JFrame implements ActionListener, MouseListener
{
        JButton b1, b2;
        JPanel panel1;
        JDialog dialog;


public sample()
{
    dialog = new JDialog();
    dialog.setBounds (0,0,200,200);

    panel1 = new JPanel();
    panel1.setLayout (new FlowLayout());

    b1 = new JButton("B1");
    add(b1);
    b1.addActionListener (this);
    b1.addMouseListener (this);

    b2 = new JButton ("B2");
    panel1.add(b2);
    b2.addMouseListener (this);
    dialog.add(panel1);

             /* I tried this but it didn't work as well:
             dialog.addMouseListener(this);
             panel1.addMouseListener(this); */
    }

    public void actionPerformed (ActionEvent e)
    {
    if (e.getSource () == b1)
        {
            dialog.setVisible (true);
        }
    }

    public void mouseClicked (MouseEvent e)
    {

    }
    public void mouseEntered (MouseEvent e)
    {
        setCursor (new Cursor (Cursor.HAND_CURSOR));
    }
    public void mouseExited (MouseEvent e)
    {
        setCursor (new Cursor(Cursor.DEFAULT_CURSOR));
    }
   public void mousePressed (MouseEvent e)
    {
    }
    public void mouseReleased (MouseEvent e)
    {
    }

    public static void main (String[] args) {
    sample s = new sample();
    s.setVisible (true);
    s.setBounds (0,0,200,200);
}
}

我的目标是当用户将鼠标悬停在B2上时光标变为手形光标，但事实并非如此。我错过了什么？

Answer 1

下一步你的问题：

您将光标设置为sample实例（JFrame），而不是JButton，将按钮更改setCursor (new Cursor (Cursor.HAND_CURSOR));上的光标设置为((JComponent)e.getSource()).setCursor (new Cursor (Cursor.HAND_CURSOR));

此外，您无需使用MouseListener即可使用：

b1.setCursor(new Cursor (Cursor.HAND_CURSOR));

mouseLIstener在JPanel / JDialog中“不工作”

1 个答案: