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Understanding the ABCs of Object-Oriented Programming: Association, Aggregation, and Composition

posted by DhruvDhruv 27 days, 4 hours, 2 minutes ago
Thursday, May 11, 2023 4:44:28 AM GMT

The article titled "Association, Aggregation, and Composition" published on C-sharpcorner.com is a comprehensive guide that explains the differences between three key concepts in object-oriented programming: Association, Aggregation, and Composition.

The article begins by defining what Association is, which is a relationship between two or more classes where one object of a class is related to one or more objects of another class. The author explains that Association can be either one-way or two-way and can be categorized as a composition, aggregation, or dependency based on the nature of the relationship.

The next concept discussed is Aggregation, which is a specialized form of Association where one object is part of another object. In Aggregation, the associated objects have their own life cycles, and they can exist independently of each other. The article provides an example of how an Employee class can be associated with a Department class using Aggregation, where each Employee belongs to a Department, but the Department can exist without any Employees.

The third concept discussed in the article is Composition, which is a stronger form of Aggregation where one object is composed of one or more objects of another class. In Composition, the associated objects cannot exist independently of the parent object, and when the parent object is destroyed, all its associated objects are destroyed too. The article provides an example of how a Car class can be composed of an Engine class, where the Engine cannot exist independently of the Car.

The article further discusses the differences between Aggregation and Composition, stating that while Aggregation represents a "has-a" relationship, Composition represents a "part-of" relationship. The author also explains that Composition is a stronger form of Aggregation because it enforces the ownership of the associated objects, while in Aggregation, the associated objects can be shared between multiple parent objects.

The article concludes by summarizing the differences between Association, Aggregation, and Composition, emphasizing the importance of understanding these concepts for designing robust and scalable object-oriented systems.

Overall, the article provides a clear and concise explanation of Association, Aggregation, and Composition, and their differences, making it a useful resource for programmers and developers. The examples provided in the article help to clarify the concepts and make them easier to understand. Programmers and developers who are new to object-oriented programming will find this article particularly helpful in understanding these concepts and using them effectively in their programming projects.

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