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Software Engineering & OOP Interview Questions & Answers

Core concepts, SOLID design principles, clean architecture, and SDLC models.

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How does encapsulation protect an object’s rules? Explain using a bank account.

Encapsulation places state and the operations that control it behind a defined interface. An account should expose deposit and withdrawal methods rather than a freely writable balance. Those methods c...

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How do abstraction and inheritance solve different problems?

Abstraction describes the capabilities a caller needs without exposing every implementation detail. A payment interface might offer charge and refund operations. Inheritance creates a subtype relation...

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