Object Oriented Programming

Question 1

What is the difference between Attributes and Methods?

Answer 1

Attribute is a variable associated with an object.
Method is a function associated with an object.

Question 2

In Object-Oriented Programming, what is an object?

Answer 2

A data type which can have associated attributes and methods.
An object is instantiated from a class.

Question 3

What is Encapsulation?

Answer 3

The bundling of data, and the methods that act on that data, into an object.

Question 4

Name the 3 OOP Principles

Answer 4

Encapsulation
Inheritance
Polymorphism

Question 5

What is Inheritance?

Answer 5

The ability of a child class to access public methods of a parent class.

Question 6

What is Polymorphism?

Answer 6

Polymorphism is the ability of methods with the same name in different classes to exhibit different behaviours at runtime.

Question 7

What is the purpose of encapsulation?

Answer 7

Encapsulation protects the data against inadvertent modification. It also separates the interface of the object or class from its implementation.
(advanatges: lowers likelihood of that specific type of bug)

Question 8

What is the purpose of inheritance?

Answer 8

To promote code reuse.

Question 9

What is the purpose of polymorphism?

Answer 9

Polymorphism promotes code generalisation.