Groups > comp.lang.java.programmer > #39452

Re: Character.isIdentifierIgnorable

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From	Arne Vajhøj <arne@vajhoej.dk>
Newsgroups	comp.lang.java.programmer
Subject	Re: Character.isIdentifierIgnorable
Date	Sat, 25 Apr 2020 13:51:22 -0400
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On 4/25/2020 1:39 PM, Jeff Higgins wrote:
> On 4/25/20 1:01 PM, Arne Vajhøj wrote:
>> On 4/25/2020 12:57 PM, Arne Vajhøj wrote:
>>> On 4/24/2020 11:36 PM, Jeff Higgins wrote:
>>>> from JLS-3.8 for JavaSE 9
>>>> Two identifiers are the same only if they are identical, that is, 
>>>> have the same
>>>> Unicode character for each letter or digit. Identifiers that have 
>>>> the same external
>>>> appearance may yet be different.
>>>>
>>>> from JLS-3.8 for JavaSE 10
>>>> Two identifiers are the same only if, after ignoring characters that 
>>>> are
>>>> ignorable, the identifiers have the same Unicode character for each 
>>>> letter
>>>> or digit. An ignorable character is a character for which the method
>>>> Character.isIdentifierIgnorable(int) returns true. Identifiers that 
>>>> have the
>>>> same external appearance may yet be different.
>>>
>>> But Java 8 javac did ignore them??
>>
>> So does Java 7 javac.
>>
>> Java 6 javac gives me an error when trying to create the class file,
>> which likely means that it is not ignoring these characters.
>>
> Thanks. I don't have earlier than 8 easily available.
> Was wondering.
> 
> I was wondering when Character,isIdentifierIgnorable(int codepoint)
> became available. The earliest javadoc that i can find is 5 and is
> available there. A Sun press release from 1997 features
> "Global language support based on Unicode 2.0 standards" so maybe
> available from then?

http://www-evasion.imag.fr/Membres/Francois.Faure/enseignement/ressources/java/jdk1.3/api/index.html

shows it in 1.3 and says "Since: JDK1.1".

Arne

Thread

Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 18:46 -0400
  Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-24 18:54 -0400
    Re: Character.isIdentifierIgnorable Martin Gregorie <martin@mydomain.invalid> - 2020-04-24 23:07 +0000
    Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 20:12 -0400
      Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-24 20:29 -0400
        Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 20:37 -0400
          Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-24 22:24 -0400
            Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 23:36 -0400
              Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-25 12:57 -0400
                Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-25 13:01 -0400
                Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-25 13:39 -0400
                Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-25 13:51 -0400
                Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-25 14:36 -0400
            Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 23:41 -0400
    Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 20:25 -0400
      Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-24 20:32 -0400
        Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 20:42 -0400
          Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-25 09:53 -0400
            Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-25 12:55 -0400
              Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-25 13:43 -0400

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