关闭对话框的Java监听器

JOptionPane optionPane = new JOptionPane("这是一个消息对话框", JOptionPane.INFORMATION_MESSAGE);

JDialog dialog = new JDialog();
dialog.setContentPane(optionPane);
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog.pack();
dialog.setLocationRelativeTo(null);
dialog.setVisible(true);

dialog.addWindowListener(new WindowAdapter() {
    @Override
    public void windowClosing(WindowEvent e) {
        System.out.println("对话框已关闭");
    }
});

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

public class DialogListenerExample {
    public static void main(String[] args) {
        JOptionPane optionPane = new JOptionPane("这是一个消息对话框", JOptionPane.INFORMATION_MESSAGE);
        JDialog dialog = new JDialog();
        dialog.setContentPane(optionPane);
        dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        dialog.pack();
        dialog.setLocationRelativeTo(null);
        dialog.setVisible(true);

        dialog.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.out.println("对话框已关闭");
            }
        });
    }
}