Java OOPs Concepts

Which of the following are the concepts of OOP?

• Encapsulation

• Polymorphism

• Abstraction

• Inheritance

Encapsulation is a process of wrapping of data and methods in a single unit called ------------------------------

• Variable

• Functions

• Class

• Box

Which feature of OOPS derives the class from another class?

• Inheritance

• Data hiding

• Encapsulation

• Polymorphism

How many types of polymorphism in the C++ programming language?

• Three types of polymorphism

• Two types of polymorphism

• Five types of polymorphism

• Four types of polymorphism

Which of the following OOP concept binds the code and data together and keeps them secure from the outside world?

• Polymorphism

• Inheritance

• Abstraction

• Encapsulation

Which member of the superclass is never accessible to the subclass?

• Public member

• Protected member

• Private member

• All of the mentioned

How can the concept of encapsulation be achieved in the program?

• By using the Access specifiers

• By using the concept of Abstraction

• By using only private members

• By using the concept of Inheritance

Which definition best defines the concept of abstraction?

• Hides the important data

• Hides the implementation and showing only the features

• Hiding the implementation

• Showing the important data

Which of the following definition best describes the concept of polymorphism?

• It is the ability to process the many messages and data in one way

• It is the ability to process the undefined messages or data in at least one way

• It is the ability to process the message or data in more than one form

• It is the ability to process the message or data in only one form

Which one of the following is not true?

• A class containing abstract methods is called an abstract class.

• Abstract methods should be implemented in the derived class.

• An abstract class cannot have non-abstract methods.

• A class must be qualified as ‘abstract’ class, if it contains one abstract method.