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

This question is a little old, but I thought I'd give an updated answer. With Java 8 you could do something along the lines of

ListMultimap multimap = ArrayListMultimap.create();
Map> map = ImmutableMap.of(
                           "1", Arrays.asList("a", "b", "c", "c"));
map.forEach(multimap::putAll);
System.out.println(multimap);

This should give you {1=[a, b, c, c]}, as desired.