I have a stream from elements of a class x. One of the arributes (t) of the class x is from type LocalDateTime and I need to group the elements by hours.
I tried something like this:
Map<Integer, List<x>> m = stream.collect(Collectors.groupingBy(x::t.getHour));
But this syntax doesn´t work, any other idea of what i might be able to do?
The attempt is actually pretty close. We can achieve the desired result with the following code snippet:
Map<Integer, List<X>> map = stream.collect(Collectors.groupingBy(x -> x.getT().getHour()));;