return tableColumns.indexOf(identifier, 0);
if (identifier == null) throw new IllegalArgumentException("Null identifier."); int columnCount = tableColumns.size(); for (int i = 0; i < columnCount; i++) { TableColumn tc = (TableColumn) tableColumns.get(i); if (identifier.equals(tc.getIdentifier())) return i; } throw new IllegalArgumentException("No TableColumn with that identifier.");
  public int getColumnIndex(Object identifier)  {    return tableColumns.indexOf(identifier, 0);  }