GroupableHeaderExample() {
    super("Groupable Header Example");

    DefaultTableModel dm = new DefaultTableModel();
    dm.setDataVector(
        new Object[][] {
          {"119", "foo", "bar", "ja", "ko", "zh"},
          {"911", "bar", "foo", "en", "fr", "pt"}
        },
        new Object[] {"SNo.", "1", "2", "Native", "2", "3"});

    JTable table =
        new JTable(dm) {
          protected JTableHeader createDefaultTableHeader() {
            return new GroupableTableHeader(columnModel);
          }
        };

    TableColumnModel cm = table.getColumnModel();
    ColumnGroup g_name = new ColumnGroup("Name");
    g_name.add(cm.getColumn(1));
    g_name.add(cm.getColumn(2));
    ColumnGroup g_lang = new ColumnGroup("Language");
    g_lang.add(cm.getColumn(3));
    ColumnGroup g_other = new ColumnGroup("Others");
    g_other.add(cm.getColumn(4));
    g_other.add(cm.getColumn(5));
    g_lang.add(g_other);

    GroupableTableHeader header = (GroupableTableHeader) table.getTableHeader();
    header.addColumnGroup(g_name);
    header.addColumnGroup(g_lang);
    JScrollPane scroll = new JScrollPane(table);
    getContentPane().add(scroll);
    setSize(400, 120);
  }