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seriously? in java?
computer science != java.
The article is incorrect in my opinion. In Java the objects need only to implement the same Interface -- they do not need to have any superclass/subclass relationship. Also, "duck typing" is an imprecise description of languages that have late binding such as Smalltalk, Ruby, and Objective-C. After reading this article, I still have no idea what is different about "polymorphic associations" and how they relate to persistent data stores.
Joebarnhart (talk) 19:14, 6 September 2009 (UTC)