Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!news-out.readnews.com!transit4.readnews.com!news-out.news.tds.net!newsreading01.news.tds.net!53ab2750!not-for-mail From: "Arne Vajhøj" Subject: Re: hashCode Message-ID: <50254C53.56591.calajapr@time.synchro.net> X-Comment-To: bob smith Newsgroups: comp.lang.java.programmer In-Reply-To: <50254C53.56590.calajapr@time.synchro.net> References: <50254C53.56590.calajapr@time.synchro.net> X-FTN-AREA: COMP.LANG.JAVA.PROGRAMMER X-FTN-MSGID: 1:261/38 39355ec2 X-FTN-REPLY: 1:261/38 5ddc2510 Content-Type: text/plain; charset=IBM437 Content-Transfer-Encoding: 8bit X-Gateway: time.synchro.net [Synchronet 3.16a-Win32 NewsLink 1.98] Lines: 26 Date: Fri, 10 Aug 2012 18:39:05 GMT NNTP-Posting-Host: 69.21.70.65 X-Complaints-To: news@tds.net X-Trace: newsreading01.news.tds.net 1344623945 69.21.70.65 (Fri, 10 Aug 2012 13:39:05 CDT) NNTP-Posting-Date: Fri, 10 Aug 2012 13:39:05 CDT Organization: tds.net Xref: csiph.com comp.lang.java.programmer:17645 To: bob smith From: Arne Vajhoj On 8/10/2012 11:47 AM, bob smith wrote: > Is it always technically correct to override the hashCode function like so: > > @Override > public int hashCode() { > return 1; > } It meets the minimum contractual obligation for that method. But performance of anything using the hash capability (like HashMap<>) would be very bad. > Would it be potentially better if that was Object's implementation? It has a different behavior that may not be valid if you override equals. 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