public static String removeExtension(String fileName){
  int index=fileName.lastIndexOf('.');
  if (index == -1) {
    return fileName;
  }
 else {
    return fileName.substring(0,index);
  }
}

public static String removeExtension ( String fileName ) { int index = fileName . lastIndexOf ( '.' ) ; if ( index == - 1 ) { return fileName ; } else { return fileName . substring ( 0 , index ) ; } }
removes the extensions of the given file name .
