Convert iterable to list using streams

Question

I have a simple loop that adds elements from one list to another list. How can the same result be achieved using streams?

List<User> users = new ArrayList<>();
for(User user: userRepository.findAll()) {
    users.add(user);
}

The reason for doing so is because userRepository.findAll() returns Iterable<User>

@Olivier The only reason for using `streams` is to be better with them. — Kristjan, Mar 06 '22 at 09:36
But it is not "better" with them. Streams are not automatically "better". And in this case, they are not. As you can see, a Stream-based solution is more complicated, and it won't be more efficient. — Stephen C, Mar 06 '22 at 10:16

score 5 · Answer 1 · answered Mar 06 '22 at 09:42

5

spliterator() converts Iterable in stream and then collect it as a List using collect()

List<User> users = 
  StreamSupport.stream(userRepository.findAll().spliterator(), false)
    .collect(Collectors.toList());

answered Mar 06 '22 at 09:42

1 Answers1