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From "Michael Garski (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENENET-284) java vs .Net GetHashCode and Equals for ArrayList
Date Thu, 19 Nov 2009 16:47:39 GMT

    [ https://issues.apache.org/jira/browse/LUCENENET-284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780140#action_12780140
] 

Michael Garski commented on LUCENENET-284:
------------------------------------------

I don't know if there are any current failing tests that this will correct, however I submitted
patches for a few issues that encountered the same list equality issues in comparing equality
between two queries after cloning.  Having a consistent implementation of how this is equality
check is performed throughout Lucene.Net would be the best solution.

> java vs .Net GetHashCode and Equals for ArrayList 
> --------------------------------------------------
>
>                 Key: LUCENENET-284
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-284
>             Project: Lucene.Net
>          Issue Type: Bug
>            Reporter: Andrei Iliev
>         Attachments: ArrayList.patch, ComparableListOfT.patch
>
>
> 1)In java the hash code of a list (and ArrayList) is defined to be the result of the
following calc:
> <code>
> hashCode = 1;
>   Iterator i = list.iterator();
>   while (i.hasNext()) {
>       Object obj = i.next();
>       hashCode = 31*hashCode + (obj==null ? 0 : obj.hashCode());
>   }
> </code>
> In .Net it hash code of object itself.
>  
> 2) In java two lists are defined to be equal if they contain the same elements in the
same order. 
> In .Net it compares the object references.

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