RFR: 8283698: Refactor Locale constructors used in src/test

[Joe Wang]

On Wed, 6 Apr 2022 17:45:13 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> This is a follow-on task after deprecating the Locale constructors (https://bugs.openjdk.java.net/browse/JDK-8282819). Most of the changes are simple replacements to Locale constructors with `Locale.of()` or Locale constants, such as `Locale.US`.

test/jdk/java/text/Format/DateFormat/DateFormatRoundTripTest.java line 81:

> 79: 
> 80:     /**
> 81:      * Parse a name like "fr_FR" into Locale.of("fr", "FR", "");

Locale.France?

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PR: https://git.openjdk.java.net/jdk/pull/8130