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| Newsgroups | comp.lang.java.programmer |
| From | Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> |
| Subject | Re: calling own methods from constructor |
| References | <slrnippkd9.phi.avl@gamma.logic.tuwien.ac.at> <alpine.DEB.2.00.1104062255160.1512@urchin.earth.li> |
| Reply-To | avl@logic.at |
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| Message-ID | <slrnipqtt1.phi.avl@gamma.logic.tuwien.ac.at> (permalink) |
| Date | 07 Apr 2011 08:36:49 GMT |
| Lines | 42 |
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Tom Anderson <twic@urchin.earth.li> wrote:
> On Wed, 6 Apr 2011, Andreas Leitgeb wrote:
>> Is there any *good* use of having the constructor call a method that
>> actually *can* be overridden in a subclass? I mean, are there
>> (non-anti)patterns of explicitly allowing subclasses to hook into
>> base-class's construction?
> public abstract class Library {
> private List<Document> documents;
> protected Library() {
> documents = new ArrayList<Document>();
> Collection<String> titles = listDocuments();
> for (String title: titles) {
> Document doc = loadDocument(title);
> // do other preparatory stuff with the document
> documents.add(doc);
> }
> }
> protected abstract Collection<String> listDocuments();
> protected abstract Document loadDocument(String title);
> }
>
> public class FilesystemLibrary extends Library {
> // ...
> }
> [...]
Sorry, in my eyes, this is one of the anti-patterns.
> What are the alternatives?
It's hard to speculate about alternatives for an artificial example.
I'd say, that they exist for any reasonable specification of the problem,
and "back it up"(*) by declaring specifications for which no (or only
mindboggingly contrived) alternatives exist as unreasonable ;-)
(*): In German, we use double-quotes also to indicate tongue-in-cheek
formulations that aren't to be taken entirely literally/serious.
I've recently learned that they are not always thusly understood,
elsewhere. Therefore this explanation. Is there any common markup
for it that would be recognized in the English-speaking world?
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calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-06 20:48 +0000
Re: calling own methods from constructor Tom Anderson <twic@urchin.earth.li> - 2011-04-06 23:06 +0100
Re: calling own methods from constructor Lew <noone@lewscanon.com> - 2011-04-06 18:24 -0400
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 08:44 +0000
Re: calling own methods from constructor Robert Klemme <shortcutter@googlemail.com> - 2011-04-07 04:14 -0700
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 12:32 +0000
Re: calling own methods from constructor Robert Klemme <shortcutter@googlemail.com> - 2011-04-07 05:55 -0700
Re: calling own methods from constructor Lew <lew@lewscanon.com> - 2011-04-07 08:10 -0700
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 20:31 +0000
Re: calling own methods from constructor Lew <lew@lewscanon.com> - 2011-04-07 14:10 -0700
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 22:15 +0000
Re: calling own methods from constructor Lew <noone@lewscanon.com> - 2011-04-07 21:22 -0400
Re: calling own methods from constructor Tom Anderson <twic@urchin.earth.li> - 2011-04-07 23:08 +0100
Re: calling own methods from constructor Lew <noone@lewscanon.com> - 2011-04-07 21:24 -0400
Re: calling own methods from constructor "Mike Schilling" <mscottschilling@hotmail.com> - 2011-04-09 22:06 -0700
Re: calling own methods from constructor Tom Anderson <twic@urchin.earth.li> - 2011-04-07 23:10 +0100
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 22:24 +0000
Re: calling own methods from constructor Lew <noone@lewscanon.com> - 2011-04-07 07:19 -0400
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 12:24 +0000
Re: calling own methods from constructor Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-06 20:46 -0400
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 08:36 +0000
Re: calling own methods from constructor Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-04-07 07:16 -0300
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 11:26 +0000
Re: calling own methods from constructor Paul Cager <paul.cager@googlemail.com> - 2011-04-07 03:20 -0700
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 11:36 +0000
Re: calling own methods from constructor Owen Jacobson <angrybaldguy@gmail.com> - 2011-04-06 22:23 -0400
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 09:13 +0000
Re: calling own methods from constructor Tobias Blass <tobiasblass@gmx.net> - 2011-04-07 10:58 +0000
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 12:19 +0000
Re: calling own methods from constructor Alessio Stalla <alessiostalla@gmail.com> - 2011-04-07 10:40 -0700
Re: calling own methods from constructor Tobias Blass <tobiasblass@gmx.net> - 2011-04-07 19:00 +0000
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 20:11 +0000
Re: calling own methods from constructor Jim Janney <jjanney@shell.xmission.com> - 2011-04-07 14:36 -0600
Re: calling own methods from constructor Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-07 20:59 -0400
Re: calling own methods from constructor Jim Janney <jjanney@shell.xmission.com> - 2011-04-07 10:26 -0600
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 20:16 +0000
Re: calling own methods from constructor Lew <lew@lewscanon.com> - 2011-04-07 14:05 -0700
Re: calling own methods from constructor Jim Janney <jjanney@shell.xmission.com> - 2011-04-07 16:15 -0600
Re: calling own methods from constructor Lew <noone@lewscanon.com> - 2011-04-07 21:28 -0400
Re: calling own methods from constructor Owen Jacobson <angrybaldguy@gmail.com> - 2011-04-07 23:21 -0400
Re: calling own methods from constructor Owen Jacobson <angrybaldguy@gmail.com> - 2011-04-07 23:39 -0400
Re: calling own methods from constructor Owen Jacobson <angrybaldguy@gmail.com> - 2011-04-07 23:58 -0400
Re: calling own methods from constructor Tom Anderson <twic@urchin.earth.li> - 2011-04-08 20:32 +0100
Re: calling own methods from constructor Tom Anderson <twic@urchin.earth.li> - 2011-04-07 23:05 +0100
Re: calling own methods from constructor Jim Janney <jjanney@shell.xmission.com> - 2011-04-07 17:38 -0600
Re: calling own methods from constructor Roedy Green <see_website@mindprod.com.invalid> - 2011-04-07 03:20 -0700
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-07 11:32 +0000
Re: calling own methods from constructor Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-04-08 01:51 +0200
Re: calling own methods from constructor Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-04-08 01:56 +0200
Re: calling own methods from constructor Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-04-08 09:30 +0000
Re: calling own methods from constructor Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-04-08 20:02 +0200
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