code: public static boolean isValid(
          int yearOfWeekdate,
          int weekOfYear
      ) {
  
          if ((yearOfWeekdate < GregorianMath.MIN_YEAR) || (yearOfWeekdate > GregorianMath.MAX_YEAR)) {
              return false;
          }
  
          return (weekOfYear >= 1) && (weekOfYear <= maximumOfWeek(yearOfWeekdate));
  
      }
docs: /*[deutsch]
  <p>Validiert das angegebene wochenbasierte Jahr und die Woche des Jahres. </p>
  
  @param   yearOfWeekdate  the year of weekdate (can be different from calendar year near New Year)
  @param   weekOfYear      the week of weekbased year
  @return  {@code true} if valid else {@code false}
  @see     #of(int, int)
  @since   4.37