如何在JPanel边框中使用JButton？

import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;

public class JPanelWithButtonExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("JPanel with JButton Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);

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

        JButton button = new JButton("Click me!");
        panel.add(button);

        // 设置边框样式
        Border border = BorderFactory.createLineBorder(Color.BLACK);
        panel.setBorder(border);

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