RFR: 8298318: (fs) APIs for handling filename extensions

[Brian Burkhalter]

On Tue, 17 Oct 2023 19:52:14 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`.

Part of the point of these methods is to cover the various use cases without ever having to deal directly with a period `"."`.

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PR Comment: https://git.openjdk.org/jdk/pull/16226#issuecomment-1768940324