RFR: 8319123: Implement JEP 461: Stream Gatherers (Preview) [v12]

[Andrey Turbanov]

On Fri, 17 Nov 2023 13:15:12 GMT, Viktor Klang <vklang at openjdk.org> wrote:

>> This Pull-Request implements [JEP-461](https://openjdk.org/jeps/461)
>
> Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Addressing trailing whitespace complaint

src/java.base/share/classes/java/util/stream/Gatherers.java line 492:

> 490:             @Override BiConsumer<A, Downstream<? super R>> finisher) implements Gatherer<T, A, R> {
> 491: 
> 492:         static <T, A, R> GathererImpl<T, A, R> of(

method seems unused

src/java.base/share/classes/java/util/stream/Gatherers.java line 564:

> 562:         }
> 563: 
> 564:         static final <T, A, R, AA, RR> GathererImpl<T, ?, RR> impl(

nit
Suggestion:

        static <T, A, R, AA, RR> GathererImpl<T, ?, RR> impl(

src/java.base/share/classes/java/util/stream/ReferencePipeline.java line 710:

> 708: 
> 709:     @Override
> 710:     public <R> R collect(Supplier<R> supplier,

alignment of parameters is lost here

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PR Review Comment: https://git.openjdk.org/jdk/pull/16420#discussion_r1397723227
PR Review Comment: https://git.openjdk.org/jdk/pull/16420#discussion_r1397723825
PR Review Comment: https://git.openjdk.org/jdk/pull/16420#discussion_r1397725659