In object-oriented programming, which term describes the 'has-a' relationship?

In object-oriented programming, which term describes the 'has-a' relationship?

• A. Is-a Relationship
• B. Has-a Relationship
• C. Abstraction
• D. Encapsulation

Answer: (B)

Has-a relationship describes a scenario where one class includes another class as a member, representing a part-whole association. This is the idea of composition (and sometimes aggregation) in object-oriented design. For example, a Car has an Engine: the Car contains an Engine and uses it to function, but an Engine isn’t a type of Car. The other concepts refer to different ideas: an is-a relationship is about inheritance (a Dog is an Animal), abstraction is about modeling only essential features, and encapsulation is about bundling data with the methods that operate on it and restricting access.

Has-a relationship describes a scenario where one class includes another class as a member, representing a part-whole association. This is the idea of composition (and sometimes aggregation) in object-oriented design. For example, a Car has an Engine: the Car contains an Engine and uses it to function, but an Engine isn’t a type of Car. The other concepts refer to different ideas: an is-a relationship is about inheritance (a Dog is an Animal), abstraction is about modeling only essential features, and encapsulation is about bundling data with the methods that operate on it and restricting access.