如何将选定的JComboBox数据项提取到Swing文本字段中？

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

public class ComboBoxExample extends JFrame {
    private JComboBox<String> comboBox;
    private JTextField textField;

    public ComboBoxExample() {
        setTitle("ComboBox Example");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());

        // 创建一个JComboBox并添加选项
        comboBox = new JComboBox<>();
        comboBox.addItem("Option 1");
        comboBox.addItem("Option 2");
        comboBox.addItem("Option 3");
        add(comboBox);

        // 创建一个文本字段
        textField = new JTextField(10);
        add(textField);

        // 添加按钮，点击按钮将选定的值设置到文本字段中
        JButton button = new JButton("Extract");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // 获取选定项的索引
                int selectedIndex = comboBox.getSelectedIndex();
                // 获取选定项的值
                String selectedValue = (String) comboBox.getSelectedItem();
                // 将选定的值设置到文本字段中
                textField.setText(selectedValue);
            }
        });
        add(button);

        pack();
        setVisible(true);
    }

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