The Development of a Game Playing Framework Using Interface-Based Programming
http://www.acm.org/crossroads/xrds10-4/gameplaying.html

Cohen, Mark A.
ACM Crossroads
2004

Abstract:

The Java programming language contains object-oriented features enabling the construction of interface-based application frameworks. Interfaces separate module implementation from core implementation, thus simplifying module development. The following article demonstrates how to take advantage of Java interfaces by designing and implementing a game playing application framework.