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

Method overriding (runtime polymorphism) allows a subclass to provide its own specific implementation of a method already defined in its superclass.

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

A constructor is a special method invoked automatically when an object is instantiated, used to set the initial state (field values) of the object.

Question 3

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

Accepted Answer

The current instance of the class

Answer

'this' is a reference to the current object — the instance on which the method is being called — and is commonly used to resolve naming conflicts between instance variables and parameters.

Question 4

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

Accepted Answer

private

Answer

The private access modifier restricts visibility to the enclosing class only, supporting encapsulation by hiding implementation details.

Question 5

What is a static method in OOP?

Accepted Answer

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

Answer

Static methods belong to the class rather than to any particular object instance, and are called on the class directly (e.g., ClassName.method()).

AMCAT Practice Test

AMCAT Practice Test

AMCAT Object-Oriented Programming Concepts 2