How to create excelfile

Question

How to create excel file and write some data in it

Answer 1

using java

Answer 2

how can create excel file without any jar file

Answer 3

i once used a library for Processing but it was compatible only with excel 2003-2007 (.xls files).
i think you may get more options by creating/editing xml or csv files that can be imported by excel as a spreadsheet.