RFR: 8172720: Collections.SingletonList::hashCode not spec-compliant

[Chris Hegarty]

> On 12 Jan 2017, at 15:42, Claes Redestad <claes.redestad at oracle.com> wrote:
> 
> Hi,
> 
> there was an issue with my patch for JDK-8037325 where the
> hashCode implemented for Collections.SingletonList was not
> compliant with specification, which breaks certain tests.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8172720
> 
> Trivial fix:
> 
> diff -r 59e5101730c8 src/java.base/share/classes/java/util/Collections.java
> --- a/src/java.base/share/classes/java/util/Collections.java	Thu Jan 12 13:38:27 2017 +0100
> +++ b/src/java.base/share/classes/java/util/Collections.java	Thu Jan 12 16:39:44 2017 +0100
> @@ -4859,7 +4859,7 @@
>         }
>         @Override
>         public int hashCode() {
> -            return Objects.hashCode(element);
> +            return 31 + Objects.hashCode(element);
>         }
>     }
> 

Looks fine.

-Chris.