Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!npeer01.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!news-in-01.newsfeed.easynews.com!easynews.com!easynews!news-out.news.tds.net!newsreading01.news.tds.net!53ab2750!not-for-mail
From: "=?UTF-8?B?QXJuZSBWYWpow7hq?=" <=?utf-8?b?qxjuzsbwywpow7hq?=@1:261/38.remove-m2z-this>
Subject: Re: hashCode
Message-ID: <5027F2CA.56696.calajapr@time.synchro.net>
X-Comment-To: Eric Sosman
Newsgroups: comp.lang.java.programmer
In-Reply-To: <5027F2CA.56695.calajapr@time.synchro.net>
References: <5027F2CA.56695.calajapr@time.synchro.net>
X-FTN-AREA: COMP.LANG.JAVA.PROGRAMMER
X-FTN-MSGID: 1:261/38 044aca2d
X-FTN-REPLY: 1:261/38 57fbd16a
Content-Type: text/plain; charset=IBM437
Content-Transfer-Encoding: 8bit
X-Gateway: time.synchro.net [Synchronet 3.16a-Win32 NewsLink 1.98]
Lines: 45
Date: Sun, 12 Aug 2012 18:58:18 GMT
NNTP-Posting-Host: 69.21.70.65
X-Complaints-To: news@tds.net
X-Trace: newsreading01.news.tds.net 1344797898 69.21.70.65 (Sun, 12 Aug 2012 13:58:18 CDT)
NNTP-Posting-Date: Sun, 12 Aug 2012 13:58:18 CDT
Organization: tds.net
X-Received-Bytes: 2520
Xref: csiph.com comp.lang.java.programmer:17752

  To: Eric Sosman
From: =?UTF-8?B?QXJuZSBWYWpow7hq?= <arne@vajhoej.dk>

On 8/11/2012 10:43 PM, Eric Sosman wrote:
>      The O.P. asked whether it would "be potentially better" if
> Object's hashCode() returned a constant.  He did *not* ask whether
> such an implementation would be correct; he only asked if it would
> "be potentially better."  Upon prompting he explained what he
> meant by "better," and in light of that explanation the answer
> to his original question is NO.  Discussions about "Oh, but it's
> CORRECT" are just red herrings; it's still not "better."


The original questions were:

#Is it always technically correct to override the hashCode function
#like so:
#
#       @Override
#       public int hashCode() {
#               return 1;
#       }

For which the answer is YES. Per documentation.

But with really poor performance in many relevant cases.

#Would it be potentially better if that was Object's implementation?

Which was clarified to:

#Better in the sense that you would never HAVE to override hashCode.

For which the answer is also YES. Per the previous.

But with the same performance note. And a big sigh because it seems to want to 
broaden bad performance from a single class to the entire programming style 
(multiple classes).

Arne

--- BBBS/Li6 v4.10 Dada-1
 * Origin: Prism bbs (1:261/38)
--- Synchronet 3.16a-Win32 NewsLink 1.98
Time Warp of the Future BBS - telnet://time.synchro.net:24