code: public static Stream<Integer> box(final int[] integers) {
          return new FixedSizeStream<>(integers.length, new Func1<Integer, Integer>() {
              @Override
              public Integer call(Integer index) {
                  return integers[index];
              }
          });
      }
docs: Creates a new stream of {@link Integer} type that contains all items of a given array.
  
  @param integers an array to get items from.
  @return a new stream of {@link Integer} type that contains all items of a given array.