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Groups > comp.lang.java.programmer > #4201
| From | Lew <noone@lewscanon.com> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Did the sort do anything? |
| Date | 2011-05-17 07:19 -0400 |
| Organization | albasani.net |
| Message-ID | <iqtljm$dt$1@news.albasani.net> (permalink) |
| References | (9 earlier) <noidndppmuNYrEzQnZ2dnUVZ_gednZ2d@earthlink.com> <iqs3tn$pqm$2@lust.ihug.co.nz> <ZOOdndoMvN_sA0zQnZ2dnUVZ_v6dnZ2d@earthlink.com> <iqt73d$dqg$2@lust.ihug.co.nz> <svudnYzs-fmh3E_QnZ2dnUVZ_gGdnZ2d@earthlink.com> |
Patricia Shanahan wrote: > Lawrence D'Oliveiro wrote: >> Patricia Shanahan wrote: >>> Lawrence D'Oliveiro wrote: >>>> Patricia Shanahan wrote: >>>>> System.identityHashCode(x) does not necessarily return the same as >>>>> x.hashCode() ... >>>> It says it does >>>> <http://developer.android.com/reference/java/lang/System.html#identityHashCode%28java.lang.Object%29>: >>>> >>>> >>>> The hash code returned is the same one that would be returned by the >>>> method java.lang.Object.hashCode(), whether or not the object's >>>> class has overridden hashCode(). >>> My sample program output showed both x.hashCode() and >>> System.identityHashCode(x) for x referencing an Integer. The values were >>> different, because Integer overrides hashCode. >> How odd, because the above documentation says otherwise. > The way I interpret it, and the way it works in practice, and the way it's documented > is that System.identityHashCode(x) returns the value that would be returned by > x.hashCode() if the object referenced by x had inherited the Object > implementation of hashCode, regardless of whether x in fact uses an > overridden hash code. In other words, Laramie, 'x.hashCode()' can be different from 'Object#hashCode()'. It's called a "method override", and the point of 'System.identityHashCode()' is to ignore any possible override of 'Object#hashCode()' and just use the base version. -- Lew Honi soit qui mal y pense. http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg
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Did the sort do anything? Roedy Green <see_website@mindprod.com.invalid> - 2011-05-10 08:06 -0700
Re: Did the sort do anything? markspace <-@.> - 2011-05-10 08:48 -0700
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-14 15:33 +1200
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-14 08:56 -0400
Re: Did the sort do anything? Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-14 13:54 +0000
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-15 11:16 +1200
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-14 23:24 -0400
Re: Did the sort do anything? Tom Anderson <twic@urchin.earth.li> - 2011-05-15 11:20 +0100
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-15 07:00 -0400
Re: Did the sort do anything? Tom Anderson <twic@urchin.earth.li> - 2011-05-15 15:09 +0100
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-16 14:28 +1200
Re: Did the sort do anything? Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-05-15 22:38 -0400
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-16 19:11 +1200
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-16 03:47 -0400
Re: Did the sort do anything? markspace <-@.> - 2011-05-16 14:14 -0700
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-15 22:40 -0400
Re: Did the sort do anything? Tom Anderson <twic@urchin.earth.li> - 2011-05-16 21:31 +0100
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-17 09:12 +1200
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-16 17:24 -0400
Re: Did the sort do anything? Tom Anderson <twic@urchin.earth.li> - 2011-05-17 13:26 +0100
Re: Did the sort do anything? markspace <-@.> - 2011-05-15 04:56 -0700
Re: Did the sort do anything? Tom Anderson <twic@urchin.earth.li> - 2011-05-15 15:12 +0100
Re: Did the sort do anything? markspace <-@.> - 2011-05-15 07:52 -0700
Re: Did the sort do anything? Michael Wojcik <mwojcik@newsguy.com> - 2011-05-18 11:14 -0400
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-18 13:02 -0400
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-20 18:49 +1200
Re: Did the sort do anything? Robert Klemme <shortcutter@googlemail.com> - 2011-05-20 00:06 -0700
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-20 22:37 +1200
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-20 07:09 -0400
Re: Did the sort do anything? Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-10 16:11 +0000
Re: Did the sort do anything? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-05-10 21:26 +0200
Re: Did the sort do anything? Tom Anderson <twic@urchin.earth.li> - 2011-05-11 21:38 +0100
Re: Did the sort do anything? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-05-11 23:27 +0200
Re: Did the sort do anything? Roedy Green <see_website@mindprod.com.invalid> - 2011-05-13 07:40 -0700
Re: Did the sort do anything? Spock <spock@starfleet.ufp> - 2011-05-13 16:56 -0400
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-15 13:58 +1200
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-14 23:27 -0400
Re: Did the sort do anything? Robert Klemme <shortcutter@googlemail.com> - 2011-05-11 20:40 +0200
Re: Did the sort do anything? Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-05-12 10:40 -0400
Re: Did the sort do anything? Robert Klemme <shortcutter@googlemail.com> - 2011-05-13 03:50 -0700
Re: Did the sort do anything? Roedy Green <see_website@mindprod.com.invalid> - 2011-05-13 07:46 -0700
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-16 14:32 +1200
Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-15 19:50 -0700
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-16 17:57 +1200
Re: Did the sort do anything? "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2011-05-16 03:35 -0400
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-16 03:44 -0400
Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-16 03:53 -0700
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-17 00:02 +1200
Re: Did the sort do anything? "javax.swing.JSnarker" <gharriman@boojum.mit.edu> - 2011-05-16 08:05 -0400
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-17 09:12 +1200
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-16 17:32 -0400
Re: Did the sort do anything? thoolen <thoolen@tholenbot.thorium> - 2011-05-16 18:09 -0400
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-16 10:02 -0400
Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-16 07:16 -0700
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-17 09:11 +1200
Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-16 15:00 -0700
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-16 21:08 -0400
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-17 19:11 +1200
Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-17 02:34 -0700
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-17 07:19 -0400
[OT] Naming conventions. Was: Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-17 06:52 -0700
Re: Naming conventions. Was: Re: Did the sort do anything? Robert Klemme <shortcutter@googlemail.com> - 2011-05-18 01:22 -0700
Re: Naming conventions. Was: Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-18 03:42 -0700
Re: Naming conventions. Was: Re: Did the sort do anything? RedGrittyBrick <RedGrittyBrick@spamweary.invalid> - 2011-05-18 11:53 +0100
Re: Naming conventions. Was: Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-18 13:07 -0400
Re: Naming conventions. Was: Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-18 10:37 -0700
Re: Naming conventions. Was: Re: Did the sort do anything? Heike Svensson <hsvensson.1093x1_q@hotmail.nospam.com.please> - 2011-05-19 01:29 -0400
Re: Naming conventions. Was: Re: Did the sort do anything? Robert Klemme <shortcutter@googlemail.com> - 2011-05-19 08:28 +0200
Re: Naming conventions. Was: Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-19 08:50 -0400
OT: National stereotypes. Was Re: Naming conventions. Was: Re: Did the sort do anything? RedGrittyBrick <RedGrittyBrick@spamweary.invalid> - 2011-05-23 10:25 +0100
Re: OT: National stereotypes. Was Re: Naming conventions. Was: Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-23 09:05 -0400
Re: OT: National stereotypes. Was Re: Naming conventions. Was: Re: Did the sort do anything? RedGrittyBrick <RedGrittyBrick@spamweary.invalid> - 2011-05-23 17:17 +0100
Re: OT: National stereotypes. Was Re: Naming conventions. Was: Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-23 14:43 -0400
Re: OT: National stereotypes. Was Re: Naming conventions. Was: Re: Did the sort do anything? Steve Sobol <sjsobol@JustThe.net> - 2011-05-23 08:27 -0700
Re: OT: National stereotypes. Was Re: Naming conventions. Was: Re: Did the sort do anything? RedGrittyBrick <RedGrittyBrick@spamweary.invalid> - 2011-05-23 17:39 +0100
Re: OT: National stereotypes. Was Re: Naming conventions. Was: Re: Did the sort do anything? Robert Klemme <shortcutter@googlemail.com> - 2011-05-23 19:16 +0200
Re: OT: National stereotypes. Was Re: Naming conventions. Was: Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-23 14:47 -0400
Re: Did the sort do anything? Boojum <boojum42@gmai1.c0m> - 2011-05-18 07:19 -0400
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-20 18:46 +1200
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-20 07:10 -0400
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-17 07:16 -0400
Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-17 06:56 -0700
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-20 18:46 +1200
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-20 07:11 -0400
Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-20 05:00 -0700
Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-20 05:20 -0700
Re: Did the sort do anything? Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-21 09:56 +1200
Re: Did the sort do anything? Lew <noone@lewscanon.com> - 2011-05-20 18:12 -0400
Re: Did the sort do anything? Patricia Shanahan <pats@acm.org> - 2011-05-20 21:26 -0700
Re: Did the sort do anything? Gheerax IV <gheerax.4@gmail.invalid> - 2011-05-17 06:58 +0000
Re: Did the sort do anything? Unitary Matrix <umatrix668@gmail.com> - 2011-05-17 00:13 -0700
Re: Did the sort do anything? markspace <-@.> - 2011-05-17 07:41 -0700
Re: Did the sort do anything? Roedy Green <see_website@mindprod.com.invalid> - 2011-05-13 07:42 -0700
Re: Did the sort do anything? Robert Klemme <shortcutter@googlemail.com> - 2011-05-13 21:28 +0200
Re: Did the sort do anything? Tom Anderson <twic@urchin.earth.li> - 2011-05-11 21:32 +0100
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