如何在JList中使用JComboBox作为元素？

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import java.awt.*;

public class JListWithComboBoxExample {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("JList with JComboBox Example");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLayout(new BorderLayout());

            // 创建数据模型
            DefaultListModel<ListItem> listModel = new DefaultListModel<>();
            listModel.addElement(new ListItem("Option 1", new String[]{"SubOption 1", "SubOption 2"}));
            listModel.addElement(new ListItem("Option 2", new String[]{"SubOption 3", "SubOption 4"}));

            // 创建JList
            JList<ListItem> list = new JList<>(listModel);
            list.setCellRenderer(new ComboBoxRenderer());
            list.setCellEditor(new ComboBoxEditor(list));
            list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
            list.addListSelectionListener(new ListSelectionListener() {
                @Override
                public void valueChanged(ListSelectionEvent e) {
                    if (!e.getValueIsAdjusting()) {
                        ListItem selectedItem = list.getSelectedValue();
                        System.out.println("Selected: " + selectedItem.getText());
                    }
                }
            });

            // 添加到frame
            frame.add(new JScrollPane(list), BorderLayout.CENTER);
            frame.setSize(300, 200);
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        });
    }

    // 自定义列表项类
    static class ListItem {
        private String text;
        private String[] subOptions;

        public ListItem(String text, String[] subOptions) {
            this.text = text;
            this.subOptions = subOptions;
        }

        public String getText() {
            return text;
        }

        public String[] getSubOptions() {
            return subOptions;
        }
    }

    // 自定义渲染器
    static class ComboBoxRenderer implements ListCellRenderer<ListItem> {
        @Override
        public Component getListCellRendererComponent(JList<? extends ListItem> list, ListItem value, int index, boolean isSelected, boolean cellHasFocus) {
            JComboBox<String> comboBox = new JComboBox<>(value.getSubOptions());
            comboBox.setEditable(false);
            comboBox.setBackground(isSelected ? list.getSelectionBackground() : list.getBackground());
            comboBox.setForeground(isSelected ? list.getSelectionForeground() : list.getForeground());
            comboBox.setBorder(new EmptyBorder(2, 5, 2, 5));
            return comboBox;
        }
    }

    // 自定义编辑器
    static class ComboBoxEditor implements ListCellEditor<ListItem> {
        private JList<ListItem> list;
        private JComboBox<String> comboBox;

        public ComboBoxEditor(JList<ListItem> list) {
            this.list = list;
        }

        @Override
        public Component getTableCellEditorComponent(JTable table, ListItem value, boolean isSelected, int row, int column) {
            comboBox = new JComboBox<>(value.getSubOptions());
            comboBox.addActionListener(e -> {
                String selectedValue = (String) comboBox.getSelectedItem();
                list.getModel().getElementAt(list.getSelectedIndex()).setText(selectedValue);
            });
            return comboBox;
        }

        @Override
        public Object getCellEditorValue() {
            return comboBox.getSelectedItem();
        }

        @Override
        public boolean isCellEditable(EventObject anEvent) {
            return true;
        }

        @Override
        public boolean shouldSelectCell(EventObject anEvent) {
            return true;
        }

        @Override
        public boolean stopCellEditing() {
            return true;
        }

        @Override
        public void cancelCellEditing() {
        }
    }
}