Objects (OOP) (Cambridge International A-Level Computer Science)

Objects (OOP)

What is an object?

• An object is a representation of a real-world entity eg teacher, aeroplane, mobile phone, cat etc
• A class is like a blueprint that describes the properties and behaviours of objects, while an object is a specific instance created based on that blueprint with its own unique values for the properties
• A constructor is a special method within a class that is automatically called when an object of that class is created (instantiated)
• Constructors typically define the initial values of instance variables and perform any necessary setup to prepare the object for use

Example of 2 objects belonging to a class

Programming objects (OOP)

How do you program an object?

Pseudocode

Pseudocode for the class 'person' and instantiating two objects

Java

Python