Cumulative Sum using Java 8 stream API

Question

I have a List of Integer say list1, and I want to get another list list2 which will contain the cumulative sum up until the current index from start. How can I do this using Str

Answer 1

An O(n) (works only sequentially) solution would be the following, but I don't find it very elegant. I guess it is a matter of taste

AtomicInteger ai = new AtomicInteger();
List collect = list1.stream()
                             .map(ai::addAndGet)
                             .collect(Collectors.toList());
System.out.println(collect); // [1, 3, 6, 10]