Path: csiph.com!x330-a1.tempe.blueboxinc.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!nx01.iad01.newshosting.com!newshosting.com!69.16.185.11.MISMATCH!npeer01.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!postnews.google.com!f11g2000yqf.googlegroups.com!not-for-mail
From: Robert Klemme <shortcutter@googlemail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: Substitute value in HashMap at runtime
Date: Thu, 13 Oct 2011 06:44:36 -0700 (PDT)
Organization: http://groups.google.com
Lines: 30
Message-ID: <c2bb16de-3ffc-4701-9aa0-1f8f5451908a@f11g2000yqf.googlegroups.com>
References: <70a582b4-956b-4145-9cb8-ba8fbaf751f5@b10g2000vbc.googlegroups.com>
NNTP-Posting-Host: 193.0.246.21
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-Trace: posting.google.com 1318513476 17485 127.0.0.1 (13 Oct 2011 13:44:36 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Thu, 13 Oct 2011 13:44:36 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: f11g2000yqf.googlegroups.com; posting-host=193.0.246.21; posting-account=MGO7qgoAAABvyo26eHVDO00044spH-ws
User-Agent: G2/1.0
X-HTTP-Via: 1.1 webwasher (Webwasher 6.8.7.9396)
X-Google-Web-Client: true
X-Google-Header-Order: ASELNKCHRUV
X-HTTP-UserAgent: Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1,gzip(gfe)
Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:8761

On Oct 13, 2:18=A0pm, mike <mikaelpetter...@hotmail.com> wrote:
> If I create a HashMap with something like:
>
> static Map<String,String> map =3D new
> HashMap<String,String>("variable",MyPreferences.getVariableValue());
>
> If I do it like this I guess that MyPreferences.getVariableValue()
> will not be substituted but be the "plain" string.
>
> How can I make my MyPreferences.getVariableValue() be evaluated at
> runtime? Any example?

One possible way is to change your Map to Map<String,
Callable<String>> and invoke call() at runtime.

http://download.oracle.com/javase/6/docs/api/java/util/concurrent/Callable.=
html

Of course you then need to provide a proper implementation. :-)

Btw, does your Map contain more entries?  If not, it's completely
superfluous.

If you define the Map as static you also need to be aware of
concurrency issues if your application will ever access this from
multiple threads.

Cheers

robert