else if (getType(columnIndex) == Attribute.NUMERIC) result = Double.class;
  public Class getColumnClass(int columnIndex) {    Class       result;        result = null;        if ( (columnIndex >= 0) && (columnIndex < getColumnCount()) ) {      if (columnIndex == 0)        result = Integer.class;      else        result = String.class;   // otherwise no input of "?"!!!    }        return result;  }