FocusListener不能像其他监听器一样添加吗？

import java.awt.*;
import java.awt.event.*;

public class MyFocusListener implements FocusListener {
    public void focusGained(FocusEvent e) {
        // 处理组件获得焦点的事件
    }

    public void focusLost(FocusEvent e) {
        // 处理组件失去焦点的事件
    }
}

public class Main {
    public static void main(String[] args) {
        JFrame frame = new JFrame("FocusListener示例");
        JTextField textField = new JTextField(20);

        // 创建一个实现了FocusListener接口的类的实例
        MyFocusListener focusListener = new MyFocusListener();

        // 将focusListener添加到textField上
        textField.addFocusListener(focusListener);

        frame.getContentPane().add(textField);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}