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Is-A relationship: Whenever one class inherits another class, it is called an IS-A relationship. Has-A relationship: Whenever an instance of one class is used in another class, it is called HAS-A relationship.

In Java, a Has-A relationship simply means that an instance of one class has a reference to an instance of another class or an other instance of the same class. For example, a car has an engine, a dog has a tail and so on .19 Tem 2019

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.

Composition is a concept that models a has a relationship . It enables creating complex types by combining objects of other types. This means that a class Composite can contain an object of another class Component . This relationship means that a Composite has a Component .