Splitting List into sublists along elements

Question

I have this list (List):

[\"a\", \"b\", null, \"c\", null, \"d\", \"e\"]

And I\'d like something like this:

Answer 1

Well, after a bit of work U have come up with a one-line stream-based solution. It ultimately uses reduce() to do the grouping, which seemed the natural choice, but it was a bit ugly getting the strings into the List> required by reduce:

List> result = list.stream()
  .map(Arrays::asList)
  .map(x -> new LinkedList(x))
  .map(Arrays::asList)
  .map(x -> new LinkedList>(x))
  .reduce( (a, b) -> {
    if (b.getFirst().get(0) == null) 
      a.add(new LinkedList());
    else
      a.getLast().addAll(b.getFirst());
    return a;}).get();

It is however 1 line!

When run with input from the question,

System.out.println(result);

Produces:

[[a, b], [c], [d, e]]