RFR: 8267587: Update java.util to use enhanced switch [v6]

[Tagir F.Valeev]

On Thu, 27 May 2021 13:47:16 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Tagir F. Valeev has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR.
>
> src/java.base/share/classes/java/util/concurrent/FutureTask.java line 495:
> 
>> 493:      * @return a string representation of this FutureTask
>> 494:      */
>> 495:     public String toString() {
> 
> Classes in java.util.concurrent are handled upstream. It would probably be better to leave them out of this patch. Or synchronize with @DougLea to see how to bring these changes in the upstream repo.

I rolled back changes in java.util.concurrent. Also, rebased the branch due to conflicts in JapaneseImperialCalendar.java

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PR: https://git.openjdk.java.net/jdk/pull/4161