无法将JTextfield添加到JTabbedPane中的JPanel上

JTextField textField = new JTextField();

JPanel panel = new JPanel();

panel.add(textField);

tabbedPane.addTab("Tab Title", panel);

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;

public class MainFrame extends JFrame {
    public MainFrame() {
        // 创建JTextField实例
        JTextField textField = new JTextField();

        // 创建JPanel实例
        JPanel panel = new JPanel();
        // 将JTextField添加到JPanel中
        panel.add(textField);

        // 创建JTabbedPane实例
        JTabbedPane tabbedPane = new JTabbedPane();
        // 将JPanel添加到JTabbedPane中
        tabbedPane.addTab("Tab Title", panel);

        // 将JTabbedPane添加到主窗口中
        add(tabbedPane);

        // 设置主窗口的属性
        setTitle("JTabbedPane Example");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

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