RFR: JDK-8302323 Add repeat methods to StringBuilder/StringBuffer

[Roger Riggs]

On Thu, 23 Feb 2023 13:13:43 GMT, Jim Laskey <jlaskey at openjdk.org> wrote:

> Add the ability to repeatedly append char and CharSequence data to StringBuilder/StringBuffer.

src/java.base/share/classes/java/lang/String.java line 4461:

> 4459: 
> 4460:     /**
> 4461:      * Used to perform copying after the initial insertion. Copying is optimized

It may be worth reinforceing that bytes are being copied, not characters and is used in both IsLatin1 and UTF16 cases with appropriate arguments.

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PR: https://git.openjdk.org/jdk/pull/12728