如何使用Java的内部类关闭GUI窗口并打印出一些文本？

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

public class GUIExample {
    private JFrame frame;

    public GUIExample() {
        frame = new JFrame("GUI Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JButton closeButton = new JButton("Close");
        closeButton.addActionListener(new CloseButtonListener());

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

    private class CloseButtonListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            System.out.println("Closing GUI window...");
            frame.dispose();
        }
    }

    public static void main(String[] args) {
        new GUIExample();
    }
}