JTextField不会像在swing中那样将值从文本字段传递到对象字段

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

public class TextFieldExample {
    private String objectField = "";

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                createAndShowGUI();
            }
        });
    }

    private static void createAndShowGUI() {
        JFrame frame = new JFrame("Text Field Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        JPanel panel = new JPanel();
        frame.getContentPane().add(panel);

        JTextField textField = new JTextField(20);
        panel.add(textField);

        JButton button = new JButton("Update Object Field");
        panel.add(button);

        TextFieldExample example = new TextFieldExample();

        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String text = textField.getText();
                example.updateObjectField(text);
                JOptionPane.showMessageDialog(null, "Object Field updated successfully!");
            }
        });

        frame.pack();
        frame.setVisible(true);
    }

    private void updateObjectField(String value) {
        objectField = value;
        // 在此处可以执行其他操作，如更新数据库等
    }
}