code: @Override
  	public int compare(E entity1, E entity2) {
  		T value = property.get(entity1);
  		T value2 = property.get(entity2);
  		return value.compareTo(value2);
  	}
docs: Compares the specified two entities.
  
  @param entity1 An entity to be compared.
  @param entity2 An entity to be compared.
  @return The comparison result.