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

You can use sublist to sum up until the current index from start:

List list = IntStream.range(0, list1.size())
        .mapToObj(i -> list1.subList(0, i + 1).stream().mapToInt(Integer::intValue).sum())
        .collect(Collectors.toList());