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![]() Unidirectional association - In a unidirectional association, two classes are related, but only one class knows that the relationship exists.Ī unidirectional association is drawn as a solid line with an open arrowhead pointing to the known class.īidirectional (standard) association - An association is a linkage between two classes. ![]() ![]() In a class diagram, an association relationship is rendered as a directed solid line. In an association relationship, an object of the whole class has objects of part class as instance data. Association specifies a "has-a" or "whole/part" relationship between two classes. Some objects are made up of other objects.
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