I have the following situation
JavaScript
x
Map<Key, ListContainer> map;
public class ListContainer {
List<AClass> lst;
}
I have to merge all the lists lst
from the ListContainer
objects from a Map
map.
JavaScript
public static void main(String[] args) {
List<AClass> alltheObjectsAClass = map.values().stream(). // continue....
}
Any idea how, using Java 8 stream API?
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Answer
I think flatMap()
is what you’re looking for.
For example:
JavaScript
List<AClass> allTheObjects = map.values()
.stream()
.flatMap(listContainer -> listContainer.lst.stream())
.collect(Collectors.toList());