RFR: 8327858: Improve spliterator and forEach for single-element immutable collections [v3]

[Chen Liang]

On Fri, 26 Apr 2024 22:27:21 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Please review this patch that:
>> 1. Implemented `forEach` to optimize for 1 or 2 element collections.
>> 2. Implemented `spliterator` to optimize for a single element.
>> 
>> The default implementations for multiple-element immutable collections are fine as-is, specializing implementation doesn't provide much benefit.
>
> Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 16 commits:
> 
>  - Add test to ensure reproducible iteration order
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/imm-coll-stream
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/imm-coll-stream
>  - Use the improved form in forEach
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/imm-coll-stream
>  - Null checks should probably be in the beginning...
>  - mark implicit null checks
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/imm-coll-stream
>  - Copyright year, revert changes for non-few element collections
>  - Merge branch 'master' of https://github.com/openjdk/jdk into feature/imm-coll-stream
>  - ... and 6 more: https://git.openjdk.org/jdk/compare/a920af23...70583024

Keep-alive.

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PR Comment: https://git.openjdk.org/jdk/pull/15834#issuecomment-2295349673