java – JComboBox无法在JTable TableHeader中扩展

我已经阅读了大多数JTable / JComboBox对此类其他问题的回复,但还没有找到解决我问题的方法.

我创建了一个具有JComboBox TableHeader元素的表.没有任何JComboBox元素将打开以显示项目列表.如何获取要显示的各个JComboBox元素的项目列表？

请注意,此问题的一个显着特征是JComboBox位于TableHeader中,未嵌入JTable单元中.

任何帮助表示赞赏.

SSCE

import java.awt.Component;
import java.awt.Dimension;
import java.util.Enumeration;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;

public class ComboHeaderTest extends JScrollPane {

private static final Dimension DEFAULT_SIZE = new Dimension(200,200);

public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run() {
            new ComboHeaderTest().initComponents();
        }
    });
}

private ComboHeaderTest() {

    final String[][] data = { {"Header 1","Header 2","Header 3"},{"A","B","C"},{"D","E","F"},{"G","H","I"}};

    setViewportView(getTable(data));
    setPreferredSize(DEFAULT_SIZE);
}

private void initComponents() {

    JFrame frame = new JFrame("ComboHeaderTest");
    frame.add(this);
    frame.pack();
    frame.setVisible(true);
}

private JTable getTable(final String[][] data) {
    final String[] items = data[0];

    final ComboHeaderRenderer[] columnHeaders = new ComboHeaderRenderer[items.length];
    for(int i = 0; items.length > i; ++i) {
        columnHeaders[i] = new ComboHeaderRenderer(items);
    }

    final JTable table = new JTable(data,columnHeaders);

    final Enumeration