private void addClasses(Class<?>[] classes,HashSet<Class<?>> result,String fieldName){
  if (classes == null || classes.length == 0)   Error.classesAbsent(fieldName,configuredClass);
  for (  Class<?> classe : classes)   result.add(classe);
}

private void addClasses ( Class < ? > [ ] classes , HashSet < Class < ? > > result , String fieldName ) { if ( classes == null || classes . length == 0 ) Error . classesAbsent ( fieldName , configuredClass ) ; for ( Class < ? > classe : classes ) result . add ( classe ) ; }
adds to the result parameter all classes that aren ' t present in it
