Created attachment 35907 [details] java code and src file this is three bug. 1,In xls , equal number behave different widths . 2,In xlsx , any number is not effect. 3,after code run ,source xls/xlsx file context is different . this bug is all alone . I think the method should ensure consistency with the outside world, and xlsx modified the source file, which is obviously wrong. For the third bug, I think that either modifying the source file or not modifying it is the right approach. zip attachment file list: Test.java :java test code 100_noEqual_inXLs.jpg :bug 1 screenshot other file :Sample resources file