Groups > comp.lang.java.programmer > #15412

Re: "Small" Program Challenge.

From	Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at>
Newsgroups	comp.lang.java.programmer
Subject	Re: "Small" Program Challenge.
Date	2012-06-19 12:36 +0000
Organization	A noiseless patient Spider
Message-ID	<slrnju0sie.u9l.avl@gamma.logic.tuwien.ac.at> (permalink)
References	(8 earlier) <c5fbd690-1af5-4427-844f-744ad0991c53@googlegroups.com> <jrofgk$ec6$1@speranza.aioe.org> <cbe27a00-af3b-48f0-82c3-c0f8ab30e1d4@googlegroups.com> <o9nvt71lop4bii7haes51im3884d2ts03k@4ax.com> <jron75$s6k$1@speranza.aioe.org>

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javax.swing.JSnarker <gharriman@boojum.mit.edu> wrote:
> However, the quoted 
> section of the JLS clearly states that initialization precedes 
> invocation (which is also just plain common sense).

Obviously, the JVM can determine availability of a static method
in a class that is loaded, but not yet initialized. Thus, during
bootstrapping the application, it *can* load the specified class,
notice lack of an appropriate main method, and skip initialization,
as it would be obviously futile for the resulting task of throwing
an exception.

Your parable about catching a ball with or without gloves falls 
flat, because the JVM can freeze the ball mid-air, while calculating
its chances to catch it and then put the gloves on only in positive
case.

I must admit, I liked the old behaviour for the sake of really simple
almost boilerplate-lean way of testing some trivial bits of code.
class Test { static { /* code */ } }
(admittedly, the enum-approach never occurred to me)
I wouldn't even care for the method-lookup exception in those cases.

Otoh, I can also understand that this doesn't win over the bare fact
that non-existence of a static method can be detected without initia-
lizing the class, and thus still doing so is against the spirit of 
lazy initialization.

Thread

"Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-13 13:45 -0700
  Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-13 13:52 -0700
    Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-13 16:17 -0700
      Re: "Small" Program Challenge. glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-06-14 00:16 +0000
    Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-13 16:19 -0700
      Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-13 16:24 -0700
    Re: "Small" Program Challenge. markspace <-@.> - 2012-06-13 17:40 -0700
  Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-13 21:28 -0400
  Re: "Small" Program Challenge. Roedy Green <see_website@mindprod.com.invalid> - 2012-06-13 20:52 -0700
    Re: "Small" Program Challenge. "Hiram Hunt" <hiramhunt@verizon.net> - 2012-06-14 08:23 -0400
      Re: "Small" Program Challenge. "Hiram Hunt" <hiramhunt@verizon.net> - 2012-06-14 08:30 -0400
    Re: "Small" Program Challenge. Arne Vajhøj <arne@vajhoej.dk> - 2012-06-17 21:17 -0400
  Re: "Small" Program Challenge. Paul Cager <paul.cager@googlemail.com> - 2012-06-14 02:32 -0700
  Re: "Small" Program Challenge. Bent C Dalager <bcd@pvv.ntnu.no> - 2012-06-14 11:29 +0000
  Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-14 12:50 -0700
  Re: "Small" Program Challenge. Leif Roar Moldskred <leifm@dimnakorr.com> - 2012-06-14 15:49 -0500
  Re: "Small" Program Challenge. Gene Wirchenko <genew@ocis.net> - 2012-06-14 14:56 -0700
  Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-14 17:02 -0700
  Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-14 17:09 -0700
  Re: "Small" Program Challenge. Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2012-06-15 22:13 -0700
    Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-16 12:11 -0700
  Re: "Small" Program Challenge. Wanja Gayk <brixomatic@yahoo.com> - 2012-06-17 15:22 +0200
    Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-17 15:24 -0700
      Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-17 18:25 -0400
        Re: "Small" Program Challenge. Arne Vajhøj <arne@vajhoej.dk> - 2012-06-17 20:31 -0400
          Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-17 20:55 -0400
            Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-17 20:40 -0700
              Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-17 23:43 -0400
              Re: "Small" Program Challenge. Lew <noone@lewscanon.com> - 2012-06-17 21:25 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 00:45 -0400
                Re: "Small" Program Challenge. Lew <lewbloch@gmail.com> - 2012-06-18 12:47 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 15:57 -0400
                Re: "Small" Program Challenge. Lew <lewbloch@gmail.com> - 2012-06-18 13:31 -0700
                Re: "Small" Program Challenge. Leif Roar Moldskred <leifm@dimnakorr.com> - 2012-06-18 16:05 -0500
                Re: "Small" Program Challenge. Lew <lewbloch@gmail.com> - 2012-06-18 14:18 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 19:50 -0400
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 19:48 -0400
                Re: "Small" Program Challenge. David Lamb <dalamb@cs.queensu.ca> - 2012-06-19 08:07 -0400
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-19 15:26 -0400
                Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-18 09:04 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 13:09 -0400
                Re: "Small" Program Challenge. markspace <-@.> - 2012-06-18 11:06 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 14:46 -0400
                Re: "Small" Program Challenge. markspace <-@.> - 2012-06-18 13:22 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 19:51 -0400
                Re: "Small" Program Challenge. Wanja Gayk <brixomatic@yahoo.com> - 2012-06-20 13:11 +0200
                Re: "Small" Program Challenge. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-06-22 12:54 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-22 18:30 -0400
                Re: "Small" Program Challenge. Lew <lewbloch@gmail.com> - 2012-06-25 12:59 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-25 16:49 -0400
                Re: "Small" Program Challenge. Lew <lewbloch@gmail.com> - 2012-06-18 12:44 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 16:01 -0400
                Re: "Small" Program Challenge. Lew <lewbloch@gmail.com> - 2012-06-18 13:36 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 20:01 -0400
                Re: "Small" Program Challenge. Lew <lewbloch@gmail.com> - 2012-06-18 18:25 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 22:01 -0400
                Re: "Small" Program Challenge. Gene Wirchenko <genew@ocis.net> - 2012-06-18 19:04 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-18 22:12 -0400
                Re: "Small" Program Challenge. Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-06-19 12:36 +0000
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-19 15:28 -0400
                Re: "Small" Program Challenge. Gene Wirchenko <genew@ocis.net> - 2012-06-19 09:12 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-19 15:30 -0400
                Re: "Small" Program Challenge. Gene Wirchenko <genew@ocis.net> - 2012-06-19 15:04 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-19 18:23 -0400
                Re: "Small" Program Challenge. Gene Wirchenko <genew@ocis.net> - 2012-06-19 15:32 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-19 19:09 -0400
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-19 19:10 -0400
                Re: "Small" Program Challenge. Lew <lewbloch@gmail.com> - 2012-06-19 17:19 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-19 20:42 -0400
                Re: "Small" Program Challenge. Leif Roar Moldskred <leifm@dimnakorr.com> - 2012-06-19 20:01 -0500
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-19 21:12 -0400
                Re: "Small" Program Challenge. Leif Roar Moldskred <leifm@dimnakorr.com> - 2012-06-19 20:32 -0500
                Re: "Small" Program Challenge. Lew <noone@lewscanon.com> - 2012-06-19 22:01 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-20 21:15 -0400
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-20 21:05 -0400
                Re: "Small" Program Challenge. Wanja Gayk <brixomatic@yahoo.com> - 2012-06-23 13:42 +0200
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-23 12:12 -0400
                Re: "Small" Program Challenge. Wanja Gayk <brixomatic@yahoo.com> - 2012-06-23 23:10 +0200
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-23 17:14 -0400
                Re: "Small" Program Challenge. Lew <noone@lewscanon.com> - 2012-06-19 22:15 -0700
                Re: "Small" Program Challenge. Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-06-20 10:34 +0000
                Re: "Small" Program Challenge. Lew <lewbloch@gmail.com> - 2012-06-20 10:45 -0700
                Re: "Small" Program Challenge. Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-06-21 08:13 +0000
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-21 17:18 -0400
                Re: "Small" Program Challenge. Lew <lewbloch@gmail.com> - 2012-06-21 15:30 -0700
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-21 20:28 -0400
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-20 21:22 -0400
                Re: "Small" Program Challenge. "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2012-06-20 21:19 -0400

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