RFR: JDK-8302323 Add repeat methods to StringBuilder/StringBuffer [v10]

[Claes Redestad]

On Mon, 27 Mar 2023 18:37:12 GMT, Jim Laskey <jlaskey at openjdk.org> wrote:

>> Add the ability to repeatedly append char and CharSequence data to StringBuilder/StringBuffer.
>
> Jim Laskey has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use Arrays.fill

test/jdk/java/lang/StringBuilder/StringBuilderRepeat.java line 180:

> 178: 
> 179:         try {
> 180:             sb.repeat(0x10FFFF + 1, -1);

Should these tests that test invalid codepoints use a valid repeat count as to verify the IAE is correctly thrown for the out-of-bound codepoint? Tests where both params are illegal are fine, too, of course.

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PR Review Comment: https://git.openjdk.org/jdk/pull/12728#discussion_r1150396671