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Polymorphism
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Two Patterns for Polymorphism Joseph Bergin Pace University jbergin@pace.edu This paper contains some patterns for dynamic polymorphism in Java primarily. The Polymorphism primary pattern gives hints on what to do during design of your program when you are thinking about the object in your program and the services they will provide. The Polymorphism secondary pattern is more useful when you are modifying an existing program that uses ad-hoc polymorphism (selection) to make decisions. Polymorphism (primary) You are thinking about the services that your program must provide. You discover that one service might be provided in more than one way. Different clients may require different versions, but generally a given client will always require the same version. How can we provide several versions of the same service cleanly and efficiently? If you provide several different methods to provide the versions of this service, you may need to write if state...
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