Method swap

corpus/java/training/guava/collect/ObjectArrays.java:220–224

Swaps array[i] with array[j].

(Object[] array, int i, int j)

   * Swaps {@code array[i]} with {@code array[j]}.
   */
  static void swap(Object[] array, int i, int j) {
    Object temp = array[i];
    array[i] = array[j];
    array[j] = temp;
  }

  @CanIgnoreReturnValue
  static Object[] checkElementsNotNull(Object... array) {