question: public int compare ( File file1 , File file2 ) { String suffix1 = FilenameUtils . getExtension ( file1 . getName ( ) ) ; String suffix2 = FilenameUtils . getExtension ( file2 . getName ( ) ) ; return caseSensitivity . checkCompareTo ( suffix1 , suffix2 ) ; }
target:  Compare the extensions of two files the specified case sensitivity.