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Re: hashCode

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  Re: hashCode "Arne Vajhøj" <������
høj@1:261/38.remove-odu-this> - 2012-08-13 19:38 +0000

#17855 — Re: hashCode

  To: Patricia Shanahan
From: "=?UTF-8?B?QXJuZSBWYWpow7hq?=" <=?utf-8?b?qxjuzsbwywpow7hq?=@1:261/38.rem
ove-nlb-this>

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

On 8/12/2012 12:40 PM, Patricia Shanahan wrote:
> Keeping hashCode as an Object method but making it useless for bucket
> selection unless overridden would not be a good alternative.
>
> A more reasonable alternative would be to have hashCode as the only
> member of a HashKey interface that would be implemented by every class
> whose objects are intended to be suitable for use as has keys. Those
> objects that have a hashCode would still have to have a usable one, but
> some classes would not implement HashKey and not have a hashCode at all.

That would avoid using the hash for classes where it does not make much sense.

I like it.

Given that there is a gazillion lines of code out there that stores Object, 
then it can not be changed.

Arne

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