the number of the last row contained in this sheet, zero based.
Owing to idiosyncrasies in the excel file format, if the result of calling this method is zero, you can't tell if that means there are zero rows on the sheet, or one at position zero. For that case, additionally call getPhysicalNumberOfRows() to tell if there is a row at position zero or not.
int representing the number of defined cells in the row.
if only columns 0,4,5 have values then there would be 3.
short representing the last logical cell in the row PLUS ONE, or -1 if the row does not contain any cells.