Groups > comp.lang.java.programmer > #2935

Re: calling own methods from constructor

From	Lew <lew@lewscanon.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: calling own methods from constructor
Date	2011-04-07 08:10 -0700
Organization	http://groups.google.com
Message-ID	<304a8aef-3852-4817-b5a7-5468fcdf11a1@x18g2000yqe.googlegroups.com> (permalink)
References	(1 earlier) <alpine.DEB.2.00.1104062255160.1512@urchin.earth.li> <inip6r$l2n$1@news.albasani.net> <slrnipqubm.phi.avl@gamma.logic.tuwien.ac.at> <41ac2ca5-83e8-4b80-92af-9704b373ec37@q36g2000yqn.googlegroups.com> <slrniprbm5.phi.avl@gamma.logic.tuwien.ac.at>

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On Apr 7, 8:32 am, Andreas Leitgeb <a...@gamma.logic.tuwien.ac.at>
wrote:
> Robert Klemme <shortcut...@googlemail.com> wrote:
> > On 7 Apr., 10:44, Andreas Leitgeb <a...@gamma.logic.tuwien.ac.at>
> > wrote:
> >> Lew <no...@lewscanon.com> wrote:
> >> > 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?
>
> >> > import org.apache.log4j.Logger;
> >> > import static org.apache.log4j.getLogger;
> >> > public class Foo
> >> > {
> >> >     private final Logger logger = getLogger( getClass() );
> >> >   // ...
> >> > }
>
> >> I thought, I made it clear, that calling static methods was not relevant
> >> to my question.  So, kind of thanks for pointing out that I should have
> >> written non-static in the very line of the question, rather than consider
> >> that clear from the other (snipped by you) paragraphs of my post...
>
> > Well, that is clear, but: getClass() isn't a static method.
>
> Because getClass() is final, it didn't occur to me, that he
> would have put up *that* as an example...
>

Boy, you're spoiling for a fight, ain't'cha, sport?

It's final but it always returns the runtime class, so it is
overridden by the individual subtypes under the hood by special
compiler magic.  Otherwise 'String#getClass()' would report type
'Object', which obviously it doesn't.

It presents the same kind of behavior as non-final overridable methods
for the purposes of this discussion.

You can use the same idiom using the "true Scotsman" definition of
overridability, just so we don't get sidetracked in a pointless
quibble.  Hm-kaay?

(uncompiled:)

 class Foo
 {
   private static final String FOOT = Foo.class.getSimpleName();
   public String getFoot()
   {
     return FOOT;
   }

   private final String represent = "Insert "+ getFoot();
   public String toString()
   {
     return represent;
   }
 }

 class Bar extends Foo
 {
   private static final String BART = Bar.class.getSimpleName();
   public String getFoot()
   {
     return BART;
   }
 }

--
Lew

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Thread

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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