How to create a Multimap from a Map>?

Question

I didn\'t find such a multimap construction... When I want to do this, I iterate over the map, and populate the multimap. Is there an other way?

final Map<         


        

Answer 1

LinkedListMultimap mm = map.entrySet()
    .stream()
    .collect(
        () -> LinkedListMultimap.create(map.size()),
        (m, e) -> m.putAll(e.getKey(), e.getValue()),
        (m1, m2) -> m1.putAll(m2));