[jira] [Comment Edited] (COLLECTIONS-708) Create CollectionUtils.hashCode using Equator

["Chen (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/COLLECTIONS-708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16922219#comment-16922219 ] 

Chen edited comment on COLLECTIONS-708 at 9/10/19 6:21 AM:
-----------------------------------------------------------

Hi [~ggregory]

 Is that the hashcode for Collection implemented using Equator hash?

{code:java}
int hashCode = 1;
for (final object e: collection B){
       hashCode = 31 * hashCode + equator. hash (e);
} 
{code}



was (Author: guoping1):
Hi [~ggregory]

 Is that the hashcode for Collection implemented using Equator hash?

{code:java}
int hashCode = 1;
for (final E: collection B){
       hashCode = 31 * hashCode + equator. hash (e);
} 
{code}


> Create CollectionUtils.hashCode using Equator
> ---------------------------------------------
>
>                 Key: COLLECTIONS-708
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-708
>             Project: Commons Collections
>          Issue Type: Improvement
>          Components: Collection
>    Affects Versions: 4.2
>            Reporter: Andrei Ivanov
>            Priority: Major
>
> Hello,
>  After discovering {{CollectionUtils#isEqualCollection}} that uses an {{Equator}}, I've started to implement {{Equator}} s for my classes, only to discover that I can't generate hashCodes for the collections that hold these classes using {{Equator#hash}}.
> I hope something like {{CollectionUtils#hashCode(Collection, Equator)}} can be implemented.



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