RFR: 8293630: Simplify TreeMap.get() with Comparator.naturalOrder() [v2]

[Сергей Цыпанов]

On Thu, 13 Oct 2022 21:46:15 GMT, ExE Boss <duke at openjdk.org> wrote:

>> Nope, there'd be a compilation error
>
> It'll work fine if an unchecked cast is used:
> Suggestion:
> 
>             @SuppressWarnings("unchecked")
>             Comparator<Map.Entry<K, V>> entryComparator = treeComparator == null ?
>                     (Comparator) Map.Entry.comparingByKey()
>                     Map.Entry.comparingByKey(treeComparator);
>             return entryComparator;
> 
> 
> This also ensures that when `treeComparator` is `null`, this method keeps returning a constant lambda.

This one looks fine, accepted.

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PR: https://git.openjdk.org/jdk/pull/9901