Object Oriented Languages

Question 1

Class

Answer 1

Template defining the attributes and methods that can be used to create a type of data known as an object.

Question 2

What does Encapsulation do?

Answer 2

It protects attributes from being directly accessed.

Question 3

How is encapsulation implemented?

Answer 3

By only allowing class methods to access data in an object’s attributes.

Question 4

Inheritance

Answer 4

The concept of subclasses inheriting the methods and attributes of its parent class.

Question 5

Method

Answer 5

A program subroutine that represents an action an object can perform.

Question 6

Object

Answer 6

An instance of a class, with a set of methods and attributes.

Question 7

Polymorphism

Answer 7

A property of OOP that means objects can behave differently depending on their class. This can result in the same method producing different outputs depending on the object involved.

Question 8

What is good about object oriented programming?

Answer 8

• Allows for a high level of reusability. This is good for projects where there are multiple components with similar properties (thanks to inheritance and polymorphism)
• Classes can be used across multiple projects.
• Encapsulation makes code more reliable by protecting attributes from being directly accessed
• Modular structure makes it easy to maintain and update

Question 9

What is bad about OOP?

Answer 9

• Requires alternative style of thinking as it is a different style of programming.
• Unsuitable for smaller programs
• Where few components are reused, OOP may result in a longer more inefficient program.

Question 10

Setter

Answer 10

A method that sets the value of a particular attribute.

Question 11

Getter

Answer 11

A method which retrieves the value of a given attribute.

Question 12

Why use getters and setters?

Answer 12

To ensure attributes cannot be directly edited and accessed.

Question 13

How is encapsulation implemented?

Answer 13

By only allowing class methods to access data in an object’s attributes.

Question 14

Constructor

Answer 14

Creates an instance of a class.

Question 15

Instantiation

Answer 15

The process of creating an object.