RFR: 8342650: Move getChars to DecimalDigits

[Shaojin Wen]

On Sun, 20 Oct 2024 17:33:09 GMT, j3graham <duke at openjdk.org> wrote:

>> Move getChars methods of StringLatin1 and StringUTF16 to DecimalDigits to reduce duplication
>> 
>> 1. HexDigits and OctalDigits also include getCharsLatin1 and getCharsUTF16
>> 2. Putting these two methods into DecimalDigits can avoid the need to expose them in JavaLangAccess
>> 3. Eliminate duplicate code in BigDecimal
>
> src/java.base/share/classes/java/math/BigDecimal.java line 4216:
> 
>> 4214:         // Get the significand as an absolute value
>> 4215:         if (intCompact != INFLATED) {
>> 4216:             coeff = new char[19];
> 
> A possibility here would be to change `coeff` to be a String. The “else” branch already creates a string and has to additionally create a char array from it. If this is the only place where the `DecimalDigits.getChars(… char[])` is used, some extra code duplication could be removed.

If this PR can be merged, we can continue to complete PR #16006, which can also remove DecimalDigits.getChars(… char[])

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PR Review Comment: https://git.openjdk.org/jdk/pull/21593#discussion_r1807927643