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From: Lew <noone@lewscanon.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: Did the sort do anything?
Date: Fri, 20 May 2011 07:10:44 -0400
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On 05/20/2011 02:46 AM, Lawrence D'Oliveiro wrote:
> 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.

That was only pointed out about five times, O Lawrence.

-- 
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg