Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Steven Simpson <ss@domain.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: What allows closures in the JLS?
Date: Mon, 10 Mar 2014 13:31:42 +0000
Organization: A noiseless patient Spider
Lines: 42
Message-ID: <uer0va-cl5.ln1@s.simpson148.btinternet.com>
References: <closures-20140308015312@ram.dialup.fu-berlin.de>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Info: mx05.eternal-september.org; posting-host="acde58fe4ecb49b864a5b7b2a919199b"; logging-data="12457"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+LiKx75vx4MmQhk1QMrblKDvEoi9PuwaU="
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0
In-Reply-To: <closures-20140308015312@ram.dialup.fu-berlin.de>
Cancel-Lock: sha1:+vV8z11XApomAO0GVUNKj7Q9TX4=
Xref: csiph.com comp.lang.java.programmer:27710

On 08/03/14 01:01, Stefan Ram wrote:
>    The JLS, in fact contains the following word sequence:
>
>        "local variables from the surrounding method may be
>        referred to"
>
>      - JLS7, 8.1.3, Example 8.1.3-2.
>
>    and this is just what I was looking for. Why do I still post
>    this question here? Because this sentence "only" appears in
>    an example (Example 8.1.3-2). I am looking for the same
>    contents in a more normative part.


I think these might cover it:

<http://docs.oracle.com/javase/specs/jls/se7/html/jls-6.html#jls-6.3>
> The /scope/ of a declaration is the region of the program within which 
> the entity declared by the declaration can be referred to using a 
> simple name, provided it is visible (§6.4.1).

> The scope of a formal parameter of a method (§8.4.1) or constructor 
> (§8.8.1) is the entire body of the method or constructor.


<http://docs.oracle.com/javase/specs/jls/se7/html/jls-6.html#jls-6.5.6.1>
> If an expression name consists of a single /Identifier/, then there 
> must be exactly one declaration denoting either a local variable, 
> parameter, or field visible (§6.4.1) at the point at which the 
> /Identifier/ occurs.  Otherwise, a compile-time error occurs. 


Also, this would be redundant if you couldn't reference parameters in an
inner class:

<http://docs.oracle.com/javase/specs/jls/se7/html/jls-8.html#jls-8.1.3>
> Any local variable, formal parameter, or exception parameter used but 
> not declared in an inner class must be declared final.

-- 
ss at comp dot lancs dot ac dot uk