Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.java.programmer > #17717
| From | Lew <noone@lewscanon.com> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: hashCode |
| Date | 2012-08-11 16:34 -0700 |
| Organization | albasani.net |
| Message-ID | <k06q6s$h3a$2@news.albasani.net> (permalink) |
| References | <563f186a-edb3-4311-ae48-3af7decfce2c@googlegroups.com> <k05muh$cq6$1@news.albasani.net> |
Jan Burse wrote: > Maybe it would make sense to spell out what the contract > for hashCode() is. Well the contract is simply, the > following invariant should hold: > > /* invariant that should hold */ > if a.equals(b) then a.hashCode()==b.hashCode() True, but if you read the specification for 'hashCode()' fully, that is not the entire contract, only the compiler-enforceable part of it. The entire specification requires that as much as feasible, the 'Object' implementation distinguish distinct instances, and that the method generally support 'HashMap', which promises O(1) 'get()' and 'put()' with a "proper" (i.e., compliant) 'hashCode()'. -- Lew Honi soit qui mal y pense. http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg
Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
hashCode bob smith <bob@coolfone.comze.com> - 2012-08-10 08:47 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-10 12:13 -0400
Re: hashCode markspace <-@.> - 2012-08-10 10:13 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-10 13:38 -0400
Re: hashCode rossum <rossum48@coldmail.com> - 2012-08-11 10:36 +0100
Re: hashCode Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-10 12:34 -0400
Re: hashCode bob smith <bob@coolfone.comze.com> - 2012-08-10 15:22 -0700
Re: hashCode Lew <lewbloch@gmail.com> - 2012-08-10 15:32 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-10 19:30 -0400
Re: hashCode Lew <noone@lewscanon.com> - 2012-08-11 16:24 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-11 22:15 -0400
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-11 22:29 -0400
Re: hashCode Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-11 22:43 -0400
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-11 22:54 -0400
Re: hashCode Lew <noone@lewscanon.com> - 2012-08-11 21:46 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-12 16:53 -0400
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-12 17:00 -0400
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-10 19:27 -0400
Re: hashCode Robert Klemme <shortcutter@googlemail.com> - 2012-08-12 17:06 +0200
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-12 16:59 -0400
Re: hashCode Robert Klemme <shortcutter@googlemail.com> - 2012-08-13 19:17 +0200
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-19 19:42 -0400
Re: hashCode Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-08-21 10:30 +0000
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-19 19:47 -0400
Re: hashCode Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-08-21 10:43 +0000
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-27 19:04 -0400
Re: hashCode Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-27 16:55 -0700
Re: hashCode markspace <-@.> - 2012-08-27 17:03 -0700
Re: hashCode Lew <lewbloch@gmail.com> - 2012-08-27 17:49 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-27 21:37 -0400
Re: hashCode Patricia Shanahan <pats@acm.org> - 2012-08-27 18:58 -0700
Re: hashCode markspace <-@.> - 2012-08-27 21:19 -0700
Re: hashCode Patricia Shanahan <pats@acm.org> - 2012-08-28 01:06 -0700
Re: hashCode markspace <-@.> - 2012-08-28 09:19 -0700
Re: hashCode Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-28 16:33 -0700
Re: hashCode markspace <-@.> - 2012-08-28 17:02 -0700
Re: hashCode Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-29 11:06 -0700
Re: hashCode Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-29 14:49 -0400
Re: hashCode Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-29 13:40 -0700
Re: hashCode Gene Wirchenko <genew@ocis.net> - 2012-08-29 18:02 -0700
Re: hashCode Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2012-08-31 00:52 +0200
Re: hashCode Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-30 21:43 -0400
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-30 21:52 -0400
Re: hashCode Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2012-08-31 04:18 +0200
Re: hashCode Jim Janney <jjanney@shell.xmission.com> - 2012-08-31 09:08 -0600
Re: hashCode Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-31 11:38 -0400
Re: hashCode Robert Klemme <shortcutter@googlemail.com> - 2012-08-31 17:55 +0200
Re: hashCode Jim Janney <jjanney@shell.xmission.com> - 2012-08-31 09:56 -0600
Re: hashCode Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-31 14:32 -0400
Re: hashCode Jim Janney <jjanney@shell.xmission.com> - 2012-08-31 14:38 -0600
Re: hashCode Lew <lewbloch@gmail.com> - 2012-08-31 15:33 -0700
Re: hashCode Jim Janney <jjanney@shell.xmission.com> - 2012-08-31 16:41 -0600
Re: hashCode Lew <lewbloch@gmail.com> - 2012-08-31 16:26 -0700
Re: hashCode Jim Janney <jjanney@shell.xmission.com> - 2012-09-02 11:54 -0600
Re: hashCode Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2012-09-03 00:47 +0200
Re: hashCode Jim Janney <jjanney@shell.xmission.com> - 2012-09-03 21:44 -0600
Re: hashCode Jim Janney <jjanney@shell.xmission.com> - 2012-08-31 09:08 -0600
Re: hashCode Robert Klemme <shortcutter@googlemail.com> - 2012-08-31 17:58 +0200
Re: hashCode markspace <-@.> - 2012-08-29 11:51 -0700
Re: hashCode Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-29 13:28 -0700
Re: hashCode markspace <-@.> - 2012-08-29 16:05 -0700
Re: hashCode Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-29 16:23 -0700
Re: hashCode Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-29 20:56 -0400
Re: hashCode Jan Burse <janburse@fastmail.fm> - 2012-08-30 11:19 +0200
Re: hashCode Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-30 10:03 -0700
Re: hashCode Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-08-30 18:34 +0000
Re: hashCode Jim Janney <jjanney@shell.xmission.com> - 2012-08-30 08:11 -0600
Re: hashCode Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-08-30 10:06 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-30 19:16 -0400
Re: hashCode Lew <lewbloch@gmail.com> - 2012-08-28 13:58 -0700
Re: hashCode Lew <lewbloch@gmail.com> - 2012-08-28 13:56 -0700
Re: hashCode Patricia Shanahan <pats@acm.org> - 2012-08-28 14:07 -0700
Re: hashCode Lew <lewbloch@gmail.com> - 2012-08-28 14:38 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-27 21:12 -0400
Re: hashCode Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-11 07:58 -0400
Re: hashCode Lew <noone@lewscanon.com> - 2012-08-11 16:29 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-11 22:16 -0400
Re: hashCode Patricia Shanahan <pats@acm.org> - 2012-08-12 03:46 -0700
Re: hashCode Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-08-12 12:23 -0400
Re: hashCode Patricia Shanahan <pats@acm.org> - 2012-08-12 09:40 -0700
Re: hashCode Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-12 13:59 -0400
Re: hashCode Patricia Shanahan <pats@acm.org> - 2012-08-12 11:17 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-12 17:02 -0400
Re: hashCode Jan Burse <janburse@fastmail.fm> - 2012-08-12 19:03 +0200
Re: hashCode Roedy Green <see_website@mindprod.com.invalid> - 2012-08-10 12:17 -0700
Re: hashCode Lew <lewbloch@gmail.com> - 2012-08-10 12:45 -0700
Re: hashCode Roedy Green <see_website@mindprod.com.invalid> - 2012-08-11 04:54 -0700
Re: hashCode Joerg Meier <joergmmeier@arcor.de> - 2012-08-11 18:25 +0200
Re: hashCode Mike Winter <usenet@michael-winter.me.invalid> - 2012-08-11 18:53 +0100
Re: hashCode Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-08-11 09:56 -0700
Re: hashCode Jan Burse <janburse@fastmail.fm> - 2012-08-11 18:58 +0200
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-11 22:40 -0400
Re: hashCode rossum <rossum48@coldmail.com> - 2012-08-11 18:47 +0100
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-10 19:25 -0400
Re: hashCode Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-08-11 08:00 -0400
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-11 09:49 -0400
Re: hashCode Jan Burse <janburse@fastmail.fm> - 2012-08-11 15:33 +0200
Re: hashCode Jan Burse <janburse@fastmail.fm> - 2012-08-11 15:34 +0200
Re: hashCode Lew <noone@lewscanon.com> - 2012-08-11 16:34 -0700
Re: hashCode Lew <noone@lewscanon.com> - 2012-08-11 16:37 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-11 22:19 -0400
Re: hashCode Lew <noone@lewscanon.com> - 2012-08-11 21:48 -0700
Re: hashCode Jan Burse <janburse@fastmail.fm> - 2012-08-12 12:08 +0200
Re: hashCode Jan Burse <janburse@fastmail.fm> - 2012-08-12 12:18 +0200
Re: hashCode Lew <noone@lewscanon.com> - 2012-08-12 11:27 -0700
Re: hashCode Arne Vajhøj <arne@vajhoej.dk> - 2012-08-12 17:11 -0400
csiph-web