RFR: JDK-8032012, , String.toLowerCase/toUpperCase performance improvement

[Xueming Shen]

On 02/06/2014 11:41 AM, Ulf Zibis wrote:
> Me again ;-)
>
>> On 02/06/2014 10:30 AM, Ulf Zibis wrote:
>>> But why not just coding:
>>> 2558             char ch = value[first];
>>> 2559             if (Character.isSurrogate(ch) {
>>> 2560                 hasSurr = true;
>>> 2561                 break;
>>> 2562             }
>>> 2563             if (ch != Character.toLowerCase((int)ch)) {  // no need to check Character.ERROR
>>> 2564                 break;
>>> 2565             }
>>>
>
> There already is Character.isUpperCase().
> I don't see, why (ch != Character.toLowerCase((int)ch) should perform better.
>
> But there is a bug in javadoc ;-)
> Your Report (Review ID: JI-9010267) - Error in doc of Character.isLowerCase/UpperCase(char)
>
> -Ulf
>

"ch != Character.toLowerCase((int)ch)" and "Character.isUpperCase(ch)" are
not equal for some code points...don't ask me why, please:-)

-Sherman