<i18n dev> RFR: 8272687: Replace StringBuffer with StringBuilder in RuleBasedCollator

[Brian Burkhalter]

On Mon, 26 Sep 2022 18:25:34 GMT, Justin Lu <duke at openjdk.org> wrote:

> Problem: Unnecessary instances of StringBuffer + .toString()
> 
> Fix: StringBuffer Replaced with StringBuilder, and .toString() removed when possible
> 
> Other: Line 698 in RuleBasedCollator.java also uses a .toString() conversion, but removing that instance requires changing the RuleBasedCollationKey constructor's second parameter type from String to StringBuilder
> 
> automated testing run passed cleanly

Marked as reviewed by bpb (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10432