RFR: 8057113: (fs) Path should have a method to obtain the filename extension [v9]

[Roger Riggs]

On Wed, 4 May 2022 21:07:14 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 superfluous new Object[] statements from test

This is still a good idea.

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PR: https://git.openjdk.java.net/jdk/pull/8066