Java 8 Way of Adding in Elements

Question

Is there a more concise, perhaps one liner way, to write the following:

ArrayList<Integer> myList = new ArrayList<>();
for (int i = 0; i < 100; i++){
    myList.add(i);
}

Using Java 8 features, and functionally insipred approaches. I'm not expecting a Haskell solution like:

ls = [1..100]

But something more elegant than the traditional imperative style.

Answer 1

One solution is

List<Integer> list = IntStream.range(0, 100).boxed().collect(Collectors.toCollection(ArrayList::new));

The steps:

1. IntStream.range(0, 100) is a stream of 100 primitive ints.
2. boxed() turns this into a stream of Integer objects. This is necessary to put the numbers into a Collection.
3. collect(Collectors.toCollection(ArrayList::new)); is how you convert a Stream to an ArrayList. You can replace ArrayList::new by any supplier for a collection, and the elements will be added to that collection.