public static String getCellIndexNumberKey(final Cell cell) {
		if (cell != null) {
			return TieConstants.CELL_ADDR_PRE_FIX + cell.getColumnIndex() + TieConstants.CELL_ADDR_PRE_FIX
					+ cell.getRowIndex();
		}
		return null;
	}
public static String getCellIndexNumberKey(final Cell cell) {
		if (cell != null) {
			return TieConstants.CELL_ADDR_PRE_FIX + cell.getColumnIndex() + TieConstants.CELL_ADDR_PRE_FIX
					+ cell.getRowIndex();
		}
		return null;
	}
public static String getCellIndexNumberKey ( final Cell cell ) { if ( cell != null ) { return TieConstants . CELL_ADDR_PRE_FIX + cell . getColumnIndex ( ) + TieConstants . CELL_ADDR_PRE_FIX + cell . getRowIndex ( ) ; } return null ; }
return cell index number key. e.g. $0$0 for A1 cell.

@param cell
input cell.
@return string.
return cell index number key . e . g . $0$0 for A1 cell .