commons-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Duncan Jones <>
Subject [LANG] Thoughts on LANG-1039
Date Fri, 26 Sep 2014 10:32:06 GMT
Hi folks,
I'd welcome someone else's viewpoint on LANG-1039. The question is: what
should HashCodeBuilder.reflectionHashCode() do when given an array object
as input.

My argument is that the intended use of this method is for overriding
Object.hashCode() and so it should never be the case than an array object
is passed to this method. (It will always be "this").

The complaint from the poster is that arrays return the result 17. This is
because arrays have no fields, so our reflection logic doesn't find
anything to add to the cumulative hash code.

I'm in favour of saying this isn't a problem, but it might be worth adding
something extra to the Javadocs to make it clearer how this method is
intended to be used and how it works. Something like "If object has no
fields, the result will be a constant value (default = 17)" or similar.

However, we could extend the method to recognise array types and return a
hashcode for the array.

I welcome thoughts on the matter.

Kind regards,


  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message