Quick Answer
Four OOP pillars in Java: Encapsulation - wrap data and methods in a class, use private fields with public getters/setters. Inheritance - subclass extends superclass to reuse and add behavior (extends keyword). Polymorphism - object behaves differently based on actual type (method overriding). Abstraction - hide complex implementation behind simple interfaces (abstract classes, interfaces).
Answer
Encapsulation: Hides internal state and exposes only required methods. Inheritance: Allows classes to reuse fields and methods. Polymorphism: Treat objects as instances of parent type. Abstraction: Hides implementation using abstract classes or interfaces.
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Verified Answer
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