code: public static boolean areEqualSets(int[] arra, int[] arrb) {
          return arra.length == arrb.length
                 && ArrayUtil.haveEqualSets(arra, arrb, arra.length);
      }
docs: Returns true if arra and arrb contain the same set of integers, not
  necessarily in the same order. This implies the arrays are of the same
  length.