On Mon, 15 Sep 2025 06:11:18 GMT, Shaojin Wen <[email protected]> wrote:

>> This PR introduces a new efficient API for appending two-digit integers to 
>> StringBuilders and refactors DateTimeHelper to leverage this new 
>> functionality.
>> 
>> Changes include:
>> 
>> 1. New `appendPair` method for efficient two-digit integer formatting 
>> (00-99):
>>    - Added `AbstractStringBuilder.appendPair(int i)` with core implementation
>>    - Added `JavaLangAccess.appendPair(StringBuilder, int)` for internal 
>> access
>>    - Added `System.JavaLangAccessImpl.appendPair(StringBuilder, int)` bridge
>>    - Added `DecimalDigits.appendPair(StringBuilder, int)` public static 
>> utility method
>>    - Enhanced Javadoc documentation for all new methods
>> 
>> 2. Refactored `DateTimeHelper` to use the new `DecimalDigits.appendPair`:
>>    - Updated `DateTimeHelper.formatTo` methods for `LocalDate` and 
>> `LocalTime`
>>    - Replaced manual formatting logic with the new efficient two-digit 
>> appending
>>    - Improved code clarity and consistency in date/time formatting
>> 
>> These changes improve code clarity and performance when formatting two-digit 
>> numbers, particularly in date/time formatting scenarios.
>
> Shaojin Wen has updated the pull request incrementally with one additional 
> commit since the last revision:
> 
>   Update test/jdk/jdk/internal/util/DecimalDigitsTest.java
>   
>   Co-authored-by: Chen Liang <[email protected]>

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

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PR Comment: https://git.openjdk.org/jdk/pull/26911#issuecomment-3292294887

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