AMCAT Object-Oriented Programming Concepts 2

Question 1

Method overriding in OOP occurs when:

Accepted Answer

A subclass defines a method with the same name and signature as a method in its superclass

Answer

A class defines two methods with the same name

Answer

A method calls itself recursively

Answer

A method is declared but not implemented

Question 2

What is the primary purpose of a constructor in a class?

Accepted Answer

To initialize an object's state when it is created

Answer

To destroy an object when it goes out of scope

Answer

To define static class-level variables

Answer

To prevent a class from being subclassed

Question 3

What does the keyword 'this' refer to inside an instance method?

Accepted Answer

The current instance of the class

Answer

The parent class of the current object

Answer

The static context of the class

Answer

The return type of the method

Question 4

Which access modifier makes a class member accessible only within the class in which it is declared?

Accepted Answer

private

Answer

public

Answer

protected

Answer

default

Question 5

What is a static method in OOP?

Accepted Answer

A method that belongs to the class itself rather than any instance

Answer

A method that can only be called on an object, not the class

Answer

A method that cannot have parameters

Answer

A method that is always overridden by subclasses

Question 6

In Java, which keyword is used to call the parent class's constructor from a subclass?

Accepted Answer

super()

Answer

this()

Answer

parent()

Answer

base()

Question 7

Which of the following OOP concepts allows hiding complex implementation details and showing only the essential features?

Accepted Answer

Abstraction

Answer

Encapsulation

Answer

Polymorphism

Answer

Inheritance