RFR: JDK-8302323 Add repeat methods to StringBuilder/StringBuffer [v3]
Jim Laskey
jlaskey at openjdk.org
Tue Feb 28 13:23:09 UTC 2023
On Tue, 28 Feb 2023 07:50:18 GMT, Tagir F. Valeev <tvaleev at openjdk.org> wrote:
>> Jim Laskey has updated the pull request incrementally with one additional commit since the last revision:
>>
>> Optimize for empty CharSequence
>
> src/java.base/share/classes/java/lang/AbstractStringBuilder.java line 1879:
>
>> 1877: * @since 21
>> 1878: * @throws IllegalArgumentException if {@code count} is less than zero
>> 1879: * @throws IndexOutOfBoundsException if the result overflows the buffer
>
> Can `IndexOutOfBoundsException` be really thrown? We don't have any index here. From the implementation I see that only `OutOfMemoryError` and `IllegalArgumentException` can be thrown.
>
> Also, I see a small descrepancy between messages in this method and `String.repeat`. The latter has:
>
>
> * @throws IllegalArgumentException if the {@code count} is
> * negative.
> *
> * @since 11
> */
> public String repeat(int count) {
> if (count < 0) {
> throw new IllegalArgumentException("count is negative: " + count);
> }
>
>
> Probably it's better to reuse the same wording ("is negative" instead of "is less than zero") for consistency?
You are correct about `IndexOutOfBoundsException`. Earlier versions used methods that threw `IndexOutOfBoundsException`. Also, changing to "is negative"
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PR: https://git.openjdk.org/jdk/pull/12728
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