IKM Object-Oriented Programming Principles 2

Question 1

What is encapsulation in OOP?

Accepted Answer

Bundling data and methods while restricting access to internal state

Answer

Encapsulation bundles data and methods within a class, hiding internal implementation.

Question 2

What is the difference between overloading and overriding?

Accepted Answer

Overloading uses different parameters in same class; overriding redefines a parent method in subclass

Answer

Overloading provides same-name methods with different parameters; overriding redefines inherited methods.

Question 3

What is an abstract class?

Accepted Answer

Class that cannot be instantiated and may contain abstract methods

Answer

Abstract classes cannot be instantiated and may have abstract methods subclasses must implement.

Question 4

What is the Liskov Substitution Principle?

Accepted Answer

Subclass objects should be replaceable for superclass objects without breaking the program

Answer

LSP states subclass objects must work wherever superclass objects are expected.

Question 5

What is composition over inheritance?

Accepted Answer

Favoring has-a relationships over is-a relationships for code reuse

Answer

Composition uses contained objects for behavior rather than extending classes.

IKM - International Knowledge Measurement Practice Test