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From: Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand>
Newsgroups: comp.lang.java.programmer
Subject: Re: Did the sort do anything?
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Date: Fri, 20 May 2011 18:46:20 +1200
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In message <svudnYzs-fmh3E_QnZ2dnUVZ_gGdnZ2d@earthlink.com>, Patricia 
Shanahan wrote:

> On 5/17/2011 12:11 AM, Lawrence D'Oliveiro wrote:
>
>> In message<ZOOdndoMvN_sA0zQnZ2dnUVZ_v6dnZ2d@earthlink.com>, Patricia
>> Shanahan wrote:
>>
>>> On 5/16/2011 2:11 PM, Lawrence D'Oliveiro wrote:
>>>
>>>> In message<noidndppmuNYrEzQnZ2dnUVZ_gednZ2d@earthlink.com>, Patricia
>>>> Shanahan wrote:
>>>>
>>>>> System.identityHashCode(x) does not necessarily return the same as
>>>>> x.hashCode() ...
>>>>
>>>> It says it does
>>>> 
<http://developer.android.com/reference/java/lang/System.html#identityHashCode%28java.lang.Object%29>:
>>>>
>>>>       The hash code returned is the same one that would be returned by
>>>>       the method java.lang.Object.hashCode(), whether or not the
>>>>       object's class has overridden hashCode().
>>>
>>> My sample program output showed both x.hashCode() and
>>> System.identityHashCode(x) for x referencing an Integer. The values were
>>> different, because Integer overrides hashCode.
>>
>> How odd, because the above documentation says otherwise.
>>
> 
> The way I interpret it, and the way it works in practice, is that
> System.identityHashCode(x) returns the value that would be returned by
> x.hashCode() if the object referenced by x had inherited the Object
> implementation of hashCode, regardless of whether x in fact uses an
> overridden hash code.

Ah. Fair enough.