RFR: 8057113: (fs) Path should have a method to obtain the filename extension [v14]

[Brian Burkhalter]

On Tue, 26 Jul 2022 00:09:09 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Resurrection of the proposal to add a method to obtain the filename extension originated in PR [2319](https://github.com/openjdk/jdk/pull/2319).
>
> Brian Burkhalter has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 18 additional commits since the last revision:
> 
>  - 8057113: Revert return type back to a nullable-String; update test
>  - Merge
>  - 8057113: Remove extensions() test method; add threthree new test cases
>  - 8057113: Revert excision of wild cards from imports
>  - 8057113: Add class level apiNote; improve getExtension() specification; remove hasExtension() and replaceExtension()
>  - Merge
>  - 8057113: Change @since annotation to 20
>  - Merge
>  - 8057113: Remove superfluous new Object[] statements from test
>  - 8057113: Fix getExtension() commcents; improve hasExtension() implementation
>  - ... and 8 more: https://git.openjdk.org/jdk/compare/e7956ca7...23ca3f10

3f510ecc32089589203b1fffb13eedc579aaa8bb fixes the `..` case which was previously yielding `null` when it should be `""`.

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PR: https://git.openjdk.org/jdk/pull/8066