RFR: 8057113: (fs) Path should have a method to obtain the filename extension [v18]

[Brian Burkhalter]

On Mon, 1 Aug 2022 21:54:22 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 incrementally with one additional commit since the last revision:
> 
>   8057113: Remove API note

Interestingly, double clicking on both the files `.txt` and `...txt` with identical content (and no file signature) in Linux File Manager, macOS Finder, and Windows Explorer all open the respective platform default text editor.

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