How to rename a file name without change its type?

Boolean rename = filediriden. RenameTo(newfilediriden); if(filediriden.isFile()){ After you rename the file, the old File object ( filediriden ) still points to the old name, which no longer exists. You want to check using the new File object ( newfilediriden ) filetype1 Also, there could be files with more than one dot in them, so maybe filetypefiletype.

Length-1 is safer.

Boolean rename = filediriden. RenameTo(newfilediriden); if(filediriden.isFile()){ After you rename the file, the old File object (filediriden) still points to the old name, which no longer exists. You want to check using the new File object (newfilediriden).

Filetype1 Also, there could be files with more than one dot in them, so maybe filetypefiletype. Length-1 is safer.

The problem is you're checking the filedirden instead of newfiledirden. At the point of test, filedirden doesn't exist anymore, as the file it points to was renamed.

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