code: public static PostalCodesMapSharedConstants create() {
      if (postalCodesMapConstants == null) { // NOPMD it's thread save!
        synchronized (PostalCodesMapConstantsImpl.class) {
          if (postalCodesMapConstants == null) {
            postalCodesMapConstants = new PostalCodesMapConstantsImpl(
                readMapFromProperties("PostalCodesMapConstants", "postalCodes"));
          }
        }
      }
      return postalCodesMapConstants;
    }
docs: Instantiates a class via deferred binding.
  
  @return the new instance, which must be cast to the requested class