RFR: 8316150: Refactor get chars and string size

[Roger Riggs]

On Wed, 13 Sep 2023 01:24:05 GMT, Shaojin Wen <duke at openjdk.org> wrote:

> 1. Reduce duplicate stringSize code
> 2. Move java.lang.StringLatin1.getChars to jdk.internal.util.DecimalDigits::getCharLatin1，not only java.lang, other packages also need to use this method

There's a lot of duplication exposed here between the `digits` method and the `getCharsLatin1` method that should be resolved. 
Can the callers of `getCharsLatin1` be converted to use `digits`?  

We also should keep HexDigits and OctalDigits classes have a consistent API and functionality.

You could benefit from compiling and testing in your repo before committing; it would cut down on the spurious changes.
and/or (before pushing) squash the intermediate commits to a single commit with a salient comment.

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PR Comment: https://git.openjdk.org/jdk/pull/15699#issuecomment-1726019081
PR Comment: https://git.openjdk.org/jdk/pull/15699#issuecomment-1733814668