RFR: JDK-8170945: Collectors$Partition should override more Map methods

[Viktor Klang]

On Wed, 5 Apr 2023 12:52:11 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

>> Adds overrides for common Map operations to avoid having to allocate the entrySet for Collectors$Partition maps.
>
> src/java.base/share/classes/java/util/stream/Collectors.java line 1988:
> 
>> 1986:         public T get(Object key) {
>> 1987:             if (key instanceof Boolean b) {
>> 1988:                 return b.booleanValue() ? forTrue : forFalse;
> 
> Can we drop `.booleanValue()` ?
> Suggestion:
> 
>                 return b ? forTrue : forFalse;

@turbanoff Definitely possible, I added it because it visually distinguishes that it is a boxed value, but perhaps relying on autoboxing in this case is just fine.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13347#discussion_r1158509411