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

Assuming you have

Map> map = ...;
Multimap multimap = ArrayListMultimap.create();

Then I believe this is the best you can do

for (String key : map.keySet()) {
  multimap.putAll(key, map.get(key));
}

or the more optimal, but harder to read

for (Entry> entry : map.entrySet()) {
  multimap.putAll(entry.getKey(), entry.getValue());
}