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Groups > comp.lang.java.programmer > #17713
| From | "rossum" <rossum@1:261/38.remove-ya-this> |
|---|---|
| Subject | Re: hashCode |
| Message-ID | <5026AEE2.56662.calajapr@time.synchro.net> (permalink) |
| Newsgroups | comp.lang.java.programmer |
| References | <50269FCD.56633.calajapr@time.synchro.net> |
| Date | 2012-08-11 19:19 +0000 |
| Organization | tds.net |
To: Lew
From: rossum <rossum48@coldmail.com>
On Fri, 10 Aug 2012 12:45:07 -0700 (PDT), Lew <lewbloch@gmail.com> wrote:
>public static int calculateHash(Foo arg) {
> int h = 0;
>
> for ( each attribute of Foo that contributes to 'equals()' )
> {
> h = 31 * h + attribute.hashCode();
> }
> return h;
>}
Bloch starts with:
int h = 17;
He says that works beter in cases where the first one or more
attribute.hashCode() values are zero, and hence will not register.
He suggessts any constant non-zero value.
rossum
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Re: hashCode "Mike Winter" <mike.winter@1:261/38.remove-ya-this> - 2012-08-11 19:19 +0000
Re: hashCode "Peter Duniho" <peter.duniho@1:261/38.remove-pjg-this> - 2012-08-11 18:17 +0000
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