CodeSignal Technical Assessment Object-Oriented Programming 2

Question 1

What is method overriding in OOP?

Accepted Answer

A subclass providing its own implementation of a method already defined in its superclass

Answer

Method overriding lets a subclass supply a specific implementation for a method defined in its parent class, changing the behavior for that subtype.

Question 2

What is method overloading?

Accepted Answer

Defining multiple methods with the same name but different parameter lists within the same class

Answer

Method overloading allows a class to have multiple methods sharing a name, differentiated by their parameter count, types, or order.

Question 3

Which access modifier restricts a class member to be accessible only within its own class?

Accepted Answer

private

Answer

`private` is the most restrictive access level, preventing any access to the member from outside the class where it is declared.

Question 4

What is an interface in object-oriented programming?

Accepted Answer

A contract specifying methods a class must implement, without providing implementation details

Answer

An interface defines a contract of method signatures that any implementing class must fulfill, enabling loose coupling and polymorphism.

Question 5

Which statement best describes the difference between composition and inheritance?

Accepted Answer

Inheritance models an 'is-a' relationship while composition models a 'has-a' relationship

Answer

Inheritance expresses that one type 'is a' subtype of another (Dog is an Animal), while composition expresses that one type 'has a' component of another (Car has an Engine).

Codesignal Practice Test

Codesignal Practice Test

CodeSignal Technical Assessment Object-Oriented Programming 2