Re: scope rules in enums

From:
Lew <noone@lewscanon.com>
Newsgroups:
comp.lang.java.programmer
Date:
Fri, 10 Jul 2009 09:13:43 -0400
Message-ID:
<h37eq7$3b4$1@news.albasani.net>
Roedy Green wrote:

On Thu, 9 Jul 2009 11:27:23 -0400, "Scott A. Hightower"
<VastError@SpamGourmet.com> wrote, quoted or indirectly quoted someone
who said :

An enum is implicitly static, but I found nothing special about the access
modifiers (public, protected, private, default) in the language spec as
regards enums.


In some ways the enum constants are subclasses of the enum as a whole.
They can override methods of the enum as a whole. You can have
abstract methods in the enum as a whole implemented by the enum
constants.

In other ways they are like inner classes.

You can cheat by disassembling and see how enums are implemented, but
I have never sat down and figured out if scope rules follow that
implementation. see http://mindprod.com/jgloss/enum.html

The scope rules should exist independent of that bit of bailing wire.


As mentioned upthread, if an enum constant has a body the constant is
implemented as an anonymous subclass of the enclosing enum, and the rules are
the normal rules for anonymous classes (in a static context) that extend the
enclosing class. If a constant does not have an enum body then the constant
is implemented as an instance of the enclosing enum itself. The JLS is very
detailed on this.

--
Lew

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