RFR: 8364007: Add overload without arguments to codePointCount in String etc.

[Mikhail Yankelevich]

On Thu, 24 Jul 2025 14:50:07 GMT, Tatsunori Uchino <duke at openjdk.org> wrote:

> Adds `codePointCount()` overloads to `String`, `Character`, `(Abstract)StringBuilder`, and `StringBuffer` to make it possible to conveniently retrieve the length of a string as code points without extra boundary checks.
> 
> 
> if (superTremendouslyLongExpressionYieldingAString().codePointCount() > limit) {
>     throw new Exception("exceeding length");
> }
> 
> 
> Is a CSR required to this change?

Could you please add a bug number under `@bug`?

test/jdk/java/lang/StringBuilder/Supplementary.java line 216:

> 214:         testAppendCodePoint(Character.MAX_CODE_POINT+1, IllegalArgumentException.class);
> 215:     }
> 216: 

nit, as the other copyrights are updated: 

* Copyright (c) 2003, 2025, Oracle and/or its affiliates. All rights reserved.

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PR Review: https://git.openjdk.org/jdk/pull/26461#pullrequestreview-3053452383
PR Review Comment: https://git.openjdk.org/jdk/pull/26461#discussion_r2229652045