Collect Java8 IntStream into Deque interface

Question

How to collect Java8 IntStream into Deque interface? I can perform this kind of operation with List like that:

List<Integer> integerList = IntStream.of(1, 2, 3)
                                     .boxed()
                                     .collect(Collectors.toList());

Answer 1

You can't collect to an interface, but to an implementation of it (as long as it is a Collection) via Collectors.toCollection

 Deque<Integer> d = IntStream.of(1, 2)
            .boxed()
            .collect(Collectors.toCollection(ArrayDeque::new));

Answer 2

use Collectors.toCollection to specify the collection you want, example:

.collect(Collectors.toCollection(ArrayDeque::new));

or any other implementation of the Deque interface.