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| From | "Arne Vajhøj" <������ høj@1:261/38.remove-nlb-this> |
| Subject | Re: hashCode |
| Message-ID | <502943B2.56749.calajapr@time.synchro.net> (permalink) |
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| Newsgroups | comp.lang.java.programmer |
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| Date | Mon, 13 Aug 2012 18:36:15 GMT |
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To: =?UTF-8?B?QXJuZSBWYWpow7hq?=
From: "=?UTF-8?B?QXJuZSBWYWpow7hq?=" <=?utf-8?b?qxjuzsbwywpow7hq?=@1:261/38.rem
ove-m2z-this>
To: =?UTF-8?B?QXJuZSBWYWpow7hq?=
From: =?UTF-8?B?QXJuZSBWYWpow7hq?= <arne@vajhoej.dk>
On 8/11/2012 10:15 PM, Arne Vajh-,j wrote:
> This is a classic test question in basic Java SE. And that returning
> a constant is correct but not smart should be in most Java SE
> text books.
Effective Java / Joshua Bloch:
<quote>
// The worst possible legal hash function - never use!
public int hashCode() { return 42; }
It is legal because it ensures that equal objects have the same hash code. It's
atrocious because ...
</quote>
Java 2 SUN Certified Programmer & Developer / Kathy Sierra & Bert Bates:
<quote>
A hashCode() that returns the same value for all instances whether they're
equal or not is still a legal - even appropriate - hashCode() method! For
example,
public int hashCode() {
return 1492;
}
would not violate the contract
...
This hashCode() method is horrible inefficient, ... ... Nontheless, this
one-hash-fits-all method would be considered appropriate and even correct
because it doesn't violate the contract. Once more, correct does not
necessarily mean good.
</quote>
Arne
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Re: hashCode "Lew" <lew@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
Re: hashCode "Arne Vajhøj" <������
høj@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
Re: hashCode "Arne Vajhøj" <������
høj@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
Re: hashCode "Eric Sosman" <eric.sosman@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
Re: hashCode "Arne Vajhøj" <������
høj@1:261/38.remove-nlb-this> - 2012-08-13 18:36 +0000
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