Which statement best describes encapsulation in object-oriented programming?

Which statement best describes encapsulation in object-oriented programming?

• A. Data hiding
• B. Inheritance
• C. Polymorphism
• D. Abstraction

Answer: (A)

Encapsulation centers on bundling data and the methods that operate on that data into a single unit and restricting direct access to the internal state. By keeping the internal fields private and exposing a controlled interface (like getters and setters or other methods), you protect the object’s invariants and prevent external code from depending on its internal representation. This data hiding helps maintain integrity, makes changes safer, and reduces coupling between an object and the rest of the system. Among the other concepts: - Inheritance is about creating new classes based on existing ones to reuse code, not about protecting internal state. - Polymorphism is about treating different objects through a common interface and deciding behavior at runtime. - Abstraction focuses on modeling only essential characteristics and hiding unnecessary details, but encapsulation specifically emphasizes the mechanism of restricting direct access to an object's data. So encapsulation is best described by data hiding, which is the practical way to enforce a clean, stable interface to an object's behavior while safeguarding its internal state.

Encapsulation centers on bundling data and the methods that operate on that data into a single unit and restricting direct access to the internal state. By keeping the internal fields private and exposing a controlled interface (like getters and setters or other methods), you protect the object’s invariants and prevent external code from depending on its internal representation. This data hiding helps maintain integrity, makes changes safer, and reduces coupling between an object and the rest of the system.

Among the other concepts:

• Inheritance is about creating new classes based on existing ones to reuse code, not about protecting internal state.

• Polymorphism is about treating different objects through a common interface and deciding behavior at runtime.

• Abstraction focuses on modeling only essential characteristics and hiding unnecessary details, but encapsulation specifically emphasizes the mechanism of restricting direct access to an object's data.

So encapsulation is best described by data hiding, which is the practical way to enforce a clean, stable interface to an object's behavior while safeguarding its internal state.