Aggregation describes a special type of an association which specifies a whole and part relationship. Association is a relationship between two classes where one class use another .
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In OOP, IS-A relationship is completely inheritance . This means, that the child class is a type of parent class. For example, an apple is a fruit. So you will extend fruit to get apple.
Read moreWhat IS-A relationship in programming?
In knowledge representation, object-oriented programming and design (see object-oriented program architecture), is-a (is_a or is a) is a subsumption relationship between abstractions (e.g. types, classes), wherein one class A is a subclass of another class B (and so B is a superclass of A) .
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An IS-A relationship is inheritance. The classes which inherit are known as sub classes or child classes. On the other hand, HAS-A relationship is composition. In OOP, IS-A relationship is completely inheritance .
Read moreWhat is aggregation in oops in C++?
C++ Aggregation (HAS-A Relationship) In C++, aggregation is a process in which one class defines another class as any entity reference . It is another way to reuse the class. It is a form of association that represents HAS-A relationship.
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An aggregate object is one which contains other objects . For example, an Airplane class would contain Engine, Wing, Tail, Crew objects. Sometimes the class aggregation corresponds to physical containment in the model (like the airplane). But sometimes it is more abstract (e.g. Club and Members).
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Definition of Aggregation in OOPS. Aggregation in OOPS is defined as a relation that exists between two or more two objects which individually have their own individual life cycle along with the ownership . Aggregation in OOPS constitutes 2 words (aggregation and OOPS).
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