Fresher (0–1 years) Technical deep dive Easy

Explain the four pillars of OOP with brief examples

Q: Explain the four pillars of OOP with brief examples

Encapsulation — hide state behind methods (private fields, public getters).Abstraction — expose essential behavior via interfaces/abstract classes.Inheritance — reuse behavior through parent/child classes (extends).Polymorphism — same interface, different implementations (method overriding, interface implementations).Keep examples in Java or C++ as used in your resume. Mention when composition is preferred over inheritance.

Very common TCS Ninja / digital fresher technical round question.

Role: Assistant System Engineer
Location: Pan India
Study track: Java

Spoiler-free prep mode

Encapsulation — hide state behind methods (private fields, public getters).

Abstraction — expose essential behavior via interfaces/abstract classes.

Inheritance — reuse behavior through parent/child classes (extends).

Polymorphism — same interface, different implementations (method overriding, interface implementations).

Keep examples in Java or C++ as used in your resume. Mention when composition is preferred over inheritance.

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