RFR: JDK-8301444: Port fdlibm hyperbolic transcendental functions to Java [v3]

[Joe Darcy]

On Wed, 8 Feb 2023 18:39:42 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Hmm. Wouldn't hurt to do so.
>> 
>> I was thinking of making a pass over Fdlibm.java at some point to make sure the nested classes had package-level rather than public accessibility and that the classes had private constructors that threw an exception (to prevent instantiation).
>
> It doesn't matter much. It was just a drive-by comment; I don't normally look at this part of the code but the PR title attracted my attention (it is not everyday you see hyperbolic transcendental PRs in the JDK), and when I skimmed through the code, some reflex part of my brain said "utility classes should be final".

Changed the nested classes for the hyperbolic functions to be final and added a private constructor.

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PR: https://git.openjdk.org/jdk/pull/12429