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Groups > comp.lang.java.programmer > #39437
| From | Jeff Higgins <invalid@invalid.org> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Character.isIdentifierIgnorable |
| Date | 2020-04-24 20:12 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <r7vv8t$8a7$1@dont-email.me> (permalink) |
| References | <r7vqa2$ekn$1@dont-email.me> <r7vqo0$15g0$1@gioia.aioe.org> |
On 4/24/20 6:54 PM, Arne Vajhøj wrote:
>>
>> For instance I can do:
>>
>> class IdentifierTest {
>> class _\u0001 {}
>> class _\u0001\u0001 {}
>> }
>>
>> and javac doesn't complain
>
> My javac complains.
>
> :-)
Well, I guess that is what I get for not doing what I said.
I used the Eclipse Java compiler to compile my example above.
When I use javac I get:
javac -version
javac 1.8.0_252
javac Z.java
Z.java:2: warning: '_' used as an identifier
class _\u0001{}
^
(use of '_' as an identifier might not be supported in releases after
Java SE 8)
Z.java:3: error: illegal unicode escape
class _\u001\u0001{}
^
Z.java:3: warning: '_' used as an identifier
class _\u001\u0001{}
^
(use of '_' as an identifier might not be supported in releases after
Java SE 8)
1 error
2 warnings
When I compile and run in Eclipse using OpenJDK 8 and 11 :
class Z {
public static void main(String[] args) {
class _\u0001{String z = "z";}
class _\u0001\u0001{String z = "zz";}
_\u0001 Z = new _\u0001();
_\u0001\u0001 ZZ = new _\u0001\u0001();
System.out.println(Z.z + ZZ.z);
}
}
prints "zzz"
That's worrisome!
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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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