string - Check file extension in Java -

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i have import data excel file database , this, check extension of chosen file.

this code:

string filename = file.getname(); string extension = filename.substring(filename.lastindexof(".") + 1, filename.length());  string excel = "xls"; if (extension != excel) {     joptionpane.showmessagedialog(null, "choose excel file!"); } else {     string filepath = file.getabsolutepath();     joptionpane.showmessagedialog(null, filepath);     string upload = uploadpodata.initialize(null, filepath);      if (upload == "ok") {         joptionpane.showmessagedialog(null, "upload successful!");     } }

but get:

choose excel file!

i can't find wrong code, please help.

following

extension != excel

should be

!excel.equals(extension)

or 

!excel.equalsignorecase(extension)

see also


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