Create only 1 list from a map where map value is list using JAVA 8 Streams

Question

I have a Map, where the \"value\" is a List of projects:

Map> projectsMap = ...

I want to extract from the map

Answer 1

projectsMap.values().stream().reduce((v1, v2) -> Stream.concat(v1.stream(), v2.stream()).collect(Collectors.toList()))