Top 3 Encapsulation Interview Questions

Browse 3 real-world technical and behavioral interview questions about Encapsulation. Review scenarios, edge cases, and architectural best practices.

Related Topics:Polymorphism Inheritance Invariants

Where does encapsulation or polymorphism change a design, and how do you decide between composition and inheritance?

Encapsulation earns its place when a class owns an invariant that callers would otherwise each have to enforce, and polymorphism when a conditional grows with every new requirement. Composition versus inheritance is decided on evidence: how many axes vary, and whether every inherited operation is honest.

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What are the four pillars of OOP, and what is the difference between abstraction and encapsulation?

Encapsulation, inheritance, polymorphism and abstraction are worth stating as consequences rather than definitions - what each one buys you and what it costs. Abstraction decides what a type means to its caller; encapsulation protects how that meaning is upheld.

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How do you decide whether a piece of behaviour belongs on the domain object or in a service?

Behaviour that needs only the object's own state, and any rule the object must never violate, belongs on the object. Services own orchestration across objects, anything requiring I/O, and the transaction boundary - which is why an entity should never hold a repository.

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