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Object Think: A Perspective on Objects

Feb 1, 2002

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Object Services

The peanut butter sandwich example reminds us that objects perform actions and make decisions; in fact, an object's capability to act is one of its three categories of responsibilities: "whom I know," "what I do," and "what I know." What an object does is known as its services. (Peter Coad and Edward Youdon, Object-Oriented Analysis, 2nd ed., Prentice Hall, 1990).

Technically, a service is simply a function, operation, method, routine, or procedure; but calling a service a function, although technically correct, flies against the object think perspective. Instead of viewing services as functions on objects, object thinkers see services as actions objects perform. The object think perspective says objects act rather than get acted on, and conduct their own business rather than hold data for functional processing.

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