如何在jframe中关闭当前窗口？

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

public class CloseWindowExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("关闭窗口示例");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);

        JButton closeButton = new JButton("关闭窗口");
        closeButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                frame.dispose();
            }
        });

        frame.getContentPane().add(closeButton, BorderLayout.CENTER);
        frame.setVisible(true);
    }
}