RFR: 8298318: (fs) APIs for handling filename extensions [v4]

[Brian Burkhalter]

On Wed, 6 Mar 2024 23:41:05 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Add to `java.nio.file.Path` a method `getExtension` to retrieve the `Path`'s extension, and companion methods `removeExtension` and `addExtension`.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8298318: Remove vestigial trim() call and commented out methods

Intentionally omitted from the recent commit b7f00bb37a99a6ec7c6ff4b2bfa3c914b028925b are:

- specialization for Unix using internal `byte[]` representation of path;
- conversion of test to JUnit 5.

These changes will be made if / when the proposal is otherwise accepted.

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PR Comment: https://git.openjdk.org/jdk/pull/16226#issuecomment-1983910450