code: public static void checkPositionIndexes(int start, int end, int size) {
      checkPositionIndex(start, size, "start index");
      checkPositionIndex(end, size, "end index");
      if (end < start) {
        throw new IndexOutOfBoundsException(format(
            "end index (%s) must not be less than start index (%s)", end, start));
      }
    }
docs: Ensures that {@code start} and {@code end} specify a valid <i>positions</i>
  in an array, list or string of size {@code size}, and are in order. A
  position index may range from zero to {@code size}, inclusive.
  
  @param start a user-supplied index identifying a starting position in an
  array, list or string
  @param end a user-supplied index identifying a ending position in an array,
  list or string
  @param size the size of that array, list or string
  @throws IndexOutOfBoundsException if either index is negative or is
  greater than {@code size}, or if {@code end} is less than {@code start}
  @throws IllegalArgumentException if {@code size} is negative