如何在JPanel GridLayout上进行鼠标进入和鼠标退出？

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class GridLayoutMouseExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("GridLayout Mouse Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(2, 2)); // 设置GridLayout布局
        
        // 添加组件
        JLabel label1 = new JLabel("Component 1");
        JLabel label2 = new JLabel("Component 2");
        JLabel label3 = new JLabel("Component 3");
        JLabel label4 = new JLabel("Component 4");
        panel.add(label1);
        panel.add(label2);
        panel.add(label3);
        panel.add(label4);
        
        // 鼠标进入事件
        panel.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseEntered(MouseEvent e) {
                panel.setBackground(Color.YELLOW); // 改变面板背景颜色为黄色
            }
        });
        
        // 鼠标退出事件
        panel.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseExited(MouseEvent e) {
                panel.setBackground(Color.WHITE); // 恢复面板背景颜色为白色
            }
        });
        
        frame.add(panel);
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
}