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

[Brian Burkhalter]

On Thu, 7 Mar 2024 20:33:36 GMT, Louis Bergelson <duke at openjdk.org> wrote:

>> test/jdk/java/nio/file/Path/Extensions.java line 81:
>> 
>>> 79:             {"compress.gzip",  "gzip"},
>>> 80:             {"waitwhat.&$!#%", "&$!#%"},
>>> 81:             {"6.283185307",    "283185307"}
>> 
>> The behavior of these test cases is good, these are the expected results of getExtension().
>
> These should probably include some compound extensions as well?   ex: "archive.tar.gz"

There is already line 75, "foo.tar.gz."

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PR Review Comment: https://git.openjdk.org/jdk/pull/16226#discussion_r1516840878