Java Swing -获取包含其他元素的元素的大小

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

public class ElementSizeExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Element Size Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

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

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

        JLabel label = new JLabel("Hello, World!");
        panel.add(label);

        // 获取包含其他元素的panel的大小
        Dimension size = panel.getSize();
        int width = size.width;
        int height = size.height;
        System.out.println("Panel size: " + width + "x" + height);

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