Java Interview Guide : 200+ Interview Questions and Answers - What is Encapsulation?

The video tutorial introduces encapsulation, a key concept in object-oriented programming, which involves hiding the implementation details of a class. Three approaches to encapsulation are discussed: direct access to class variables, using getters and setters, and encapsulating logic within methods. The tutorial emphasizes that the third approach, which abstracts operations into methods, offers the best encapsulation. This method allows changes in implementation without affecting external classes. The video concludes with a recommendation to practice encapsulation in programming.

What is the primary goal of encapsulation in object-oriented programming?

• To expose all class details to other classes

• To hide the implementation details of a class

• To increase the complexity of a class

• To make classes dependent on each other

Which of the following is a limitation of directly accessing class variables?

• It simplifies the class interface

• It makes the code more readable

• It exposes the internal state of the class

• It allows for easy modification of variables

How do getters and setters improve encapsulation compared to direct variable access?

• They allow direct modification of variables

• They hide the internal state and control access

• They expose the class implementation details

• They make the class interface more complex

What is the advantage of using method-based encapsulation over getters and setters?

• It allows direct access to class variables

• It exposes the internal logic of the class

• It simplifies the class interface by abstracting operations

• It makes the class dependent on external classes

Why is the method-based approach considered the best for encapsulation?

• It makes the class interface less intuitive

• It allows for direct variable access

• It keeps the logic and data encapsulated within the class

• It requires more code to implement