Question 1

What are the SOLID principles of object-oriented design?

Accepted Answer

SOLID is an acronym for five design principles: Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion. These principles help create more maintainable, flexible, and scalable software.

Question 2

What is the difference between aggregation and composition?

Accepted Answer

Both aggregation and composition are types of association. In composition, the child object cannot exist without the parent object (e.g., a house and its rooms). In aggregation, the child object can exist independently of the parent object (e.g., a department and its professors).

Object-Oriented Design Interview Questions

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