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What is the difference between Association, Aggregation and Composition?

April 26, 2017aggregation Association composition difference

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What is the difference between Association, Aggregation and Composition?

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Association is a (*a*) relationship between two classes, where one class use another. But aggregation describes a special type of an association. Aggregation is the (*the*) relationship between two classes. When object of one class has an (*has*) object of another, if second is a part of first (containment relationship) then we called that there is an aggregation between two classes. Unlike association, aggregation always insists a direction.