juniorOOP
What is encapsulation in OOP?
Updated May 17, 2026
Short answer
Encapsulation is bundling data and methods together and restricting direct access.
Deep explanation
Encapsulation hides internal state and exposes controlled access via methods. It improves security, maintainability, and modularity.
Real-world example
Bank systems hide account balance and expose only deposit/withdraw methods.
Common mistakes
- Directly exposing class fields as public variables.
Follow-up questions
- Why is data hiding important?
- How does encapsulation improve maintainability?