Computer scienceProgramming languagesJavaCode organizationFunctional programmingFunctional streams

Grouping collectors

Grouping numbers

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Given a stream with the groupingBy collector.

??? numbers = Stream.of(1, 2, 1, 3, 2, 4).collect(Collectors.groupingBy(Function.identity()));

The identity function is equal to x -> x.

The result is a Map. What elements does the map contain?

Note, {} is the brackets for a map, [] is the brackets for a list.

Select one option from the list

{1=1, 2=2, 3=3, 4=4}

{1=[1], 2=[2], 3=[3], 4=[4]}

{1=[],2=[],3=[],4=[]}

{1=[1, 1], 2=[2, 2], 3=[3], 4=[4]}

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