How to collect Stream> into Map> using java 8?

Question

I have a stream of Map that I want to collect into a single Map>. Does anybody have a suggesti

Answer 1

Say i had:

Stream> mapStream

Then the answer is:

mapStream.map(Map::entrySet)
         .flatMap(Collection::stream)
         .collect(Collectors.groupingBy(Map.Entry::getKey, Collectors.mapping(Map.Entry::getValue, Collectors.toList())));