Core Java SE 9 for the Impatient by Horstmann Cay S

Author:Horstmann, Cay S. [Horstmann, Cay S.]
Language: eng
Format: azw3
Publisher: Pearson Education
Published: 2017-09-15T04:00:00+00:00

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Note

If you call the groupingByConcurrent method, you get a concurrent map that, when used with a parallel stream, is concurrently populated. This is entirely analogous to the toConcurrentMap method.

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8.11 Downstream Collectors

The groupingBy method yields a map whose values are lists. If you want to process those lists in some way, supply a downstream collector. For example, if you want sets instead of lists, you can use the Collectors.toSet collector that you saw in the preceding section:

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