Association (object-oriented programming)


Association (object-oriented programming)

In Object-oriented programming, Association defines a relationship between classes of objects which allows one object instance to cause another to perform an action on its behalf. This relationship is structural, because it specifies that objects of one kind are connected to objects of another.

In generic terms the causation is usually called "sending a message", "invoking a method" or "calling a member function" to the controlled object. Concrete implementation usually requires the requesting object to invoke a "method" or "member function" using a reference or pointer to the memory location of the controlled object.

The objects that are related via the association are considered to act in a role with respect to the association, if object's current state in the active situation allows the other associated objects to use the object in the manner specified by the role. A role can be used to distinguish two objects of the same class when describing its use in the context of the association. A role describes the "public" aspects of an object with respect to an association. [Rumbaugh]

ee also

*Rumbaugh et al. "Object-oriented modeling and design", Prentice Hall, 1991, ISBN 0-13-630054-5
*Aggregation
*Inheritance
*File association


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