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

Defining multiple methods with the same name but different parameters in the same class

Answer

Hiding a parent class method using access modifiers in a child class

Answer

Calling a superclass method from within a subclass constructor

Question 2

What is method overloading?

Accepted Answer

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

Answer

A subclass replacing a parent class method at runtime

Answer

Calling a parent class method explicitly from a subclass

Answer

A method that calls itself to solve a problem recursively

Question 3

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

Accepted Answer

private

Answer

public

Answer

protected

Answer

internal

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

A concrete class that provides default behavior for all its methods

Answer

A way to achieve multiple concrete inheritance through class extension

Answer

A special constructor used exclusively by abstract classes

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

Composition uses `extends` while inheritance uses `implements`

Answer

Composition is only available in functional languages; inheritance is exclusive to OOP

Answer

Inheritance enables code reuse while composition does not

Question 6

What defines a static method in OOP?

Accepted Answer

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

Answer

A method that cannot be overridden by any subclass

Answer

A method that takes no parameters and returns no value

Answer

A method whose return value never changes regardless of input

Question 7

Which SOLID principle states that software entities should be open for extension but closed for modification?

Accepted Answer

Open/Closed Principle

Answer

Single Responsibility Principle

Answer

Liskov Substitution Principle

Answer

Dependency Inversion Principle