单击按钮时JLabel不会被删除

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

public class ButtonExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Button Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);
        
        JButton button = new JButton("Delete Label");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                frame.getContentPane().remove(label);
                frame.revalidate();
                frame.repaint();
            }
        });
        frame.getContentPane().add(button);
        
        frame.pack();
        frame.setVisible(true);
    }
}