RFR: 8366224: Introduce DecimalDigits.appendPair for efficient two-digit formatting and refactor DateTimeHelper [v5]

[Shaojin Wen]

On Mon, 15 Sep 2025 13:53:23 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> I'd rather see a real public API even if it looks like `StringBuilder::appendInteger(boolean alwaysSign, boolean packWithZero, int minWidth, int number)`.

Methods like appendPair are provided for better performance, and you suggest that it is not easy to achieve the same performance with such an API.

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PR Comment: https://git.openjdk.org/jdk/pull/26911#issuecomment-3305071018