Programming Paradigm

a container used to store both data and instruction , it is created from classes using instantiation

specify what properties and methods objects of their type would have

Can only be accessed within the class it was declared and nowhere else (two underscore )

a function or procedure within a class that’s accessible and callable from any other part of the program, inside or outside its class

A protected method is a class function that is intended to be accessible only within the class itself and its subclasses (child classes) one underscore

grouping of attributes and methods are stored in the objects / combining methods and procedures to form an object

allows one class to share the properties and methods of another class . It “is a “ relationship

WHen objects are processed differently depending on their class

Sane name as a method in an inherited class but different implementation

descibed as having a “has a “ relationship

weaker type of association , it would exists if its containing object is destroyed

The containing object is destroyed , the association object is also destroyed ( stronger relationship)

it provides program with clear structure makes developing and testing easier for developers Allows large projects to be divided among teams of developers it improves the space efficency of code

Encapsulate what varies Favour composition over inheritance Program to interface , not implementation

Any requirement which are likely to change in the future would be encapsulated in a class , this way future changes can be easily made when required

composition has a more flexible relationship by unrelated classes

allow unrelated classes to make use of similar methods