如何在鼠标移动创建的矩形上使用工具提示- Java

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

public class RectangleTooltipExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Rectangle Tooltip Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 400);

        JPanel panel = new JPanel() {
            @Override
            protected void paintComponent(Graphics g) {
                super.paintComponent(g);
                g.setColor(Color.RED);
                g.fillRect(100, 100, 200, 100);
            }
        };

        panel.addMouseMotionListener(new MouseMotionAdapter() {
            @Override
            public void mouseMoved(MouseEvent e) {
                if (e.getX() >= 100 && e.getX() <= 300 && e.getY() >= 100 && e.getY() <= 200) {
                    panel.setToolTipText("This is a rectangle");
                } else {
                    panel.setToolTipText(null);
                }
            }
        });

        frame.add(panel);
        frame.setVisible(true);
    }
}