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From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>
Newsgroups: comp.lang.java.programmer
Subject: Re: Character.isIdentifierIgnorable
Date: Fri, 24 Apr 2020 20:32:38 -0400
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On 4/24/2020 8:25 PM, Jeff Higgins wrote:
> On 4/24/20 6:54 PM, Arne Vajhøj wrote:
> 
>>> Where exactly in the Java environment (tools, language, standard 
>>> libraries, etc.) are two identifiers checked according to the above 
>>> specification?
>>>
>>> For instance I can do:
>>>
>>> class IdentifierTest {
>>>    class _\u0001 {}
>>>    class _\u0001\u0001 {}
>>> }
>>>
>>> and javac doesn't complain
>>
>> My javac complains.
>>
>> :-)

> Anyways, thanks for the answer to above.
> 
> Now, just to figure out why Eclipse is happy with above.

Eclipse comes with its own Java compiler - I am not
quite sure how much if at all it relies on the JDK
tools.jar.

Different implementation of a compiler can behave
differently.

Any differences in normal code will be found pretty
quickly.

But differences in funky code may go undetected
for years.

Arne