Java SE 8 Programmer I — Question 33

Which statement best describes encapsulation?

Answer options

• A. Encapsulation ensures that classes can be designed so that only certain fields and methods of an object are accessible from other objects.
• B. Encapsulation ensures that classes can be designed so that their methods are inheritable.
• C. Encapsulation ensures that classes can be designed with some fields and methods declared as abstract.
• D. Encapsulation ensures that classes can be designed so that if a method has an argument MyType x, any subclass of MyType can be passed to that method.

Correct answer: A

Explanation

The correct answer, A, accurately describes encapsulation as it focuses on restricting access to certain components of a class, promoting data hiding. Options B and C address concepts related to inheritance and abstraction, which are not directly related to encapsulation. Option D speaks to polymorphism, which is a separate concept from encapsulation.