INTRODUCTION TO OBJECT ORIENTED PROGRAMMING (OOP)

A method od programming based on a hierarchy of classes, together with well-defined and cooperating objects

CAR OBJECT: A real world object and it has its own characteristic like color of the car, size model of the car,engine capacity

CLASSES AND OBJECTS

-CLASS: Template/blueprint to create an object

-OBJECT: Instance of a class

-Characteristics of real world object are variables/data members in a class

-Behaviour of objects are called as methods/member functions of a class

BEHAVIOUR: Operation/function that an object can perform

ATTRIBUTES: Data value/state that describes an object and helps you to tell one object from another of the same class

OBJECT: An instance/specific example of a class

UML: A graphical language designed to capture the artifacts of an OOAD process

Process of defining the problem in terms of real-world objects

THE PRIMARY TASK IN OOA:

-Identifying objects

-Organizing the objects

Defining the object attributes

Defining the function of objects

Describing how objects interact

A technical approach used in the analysis and design of a system

ADVANTAGES: Easy to understand, easy to maintain, provide re-usability, reduce the development time & cost, improves the quality of system

DISADVANTAGES: All time is not easy to determine all the necessary classes and objects required for a system, offers a new project management so it may be difficult to complete a solution with estimated time and budget, without an explicit reuse on a large scale

Defining the components, interfaces, objects, classes, attributes and operations that will satisfy the requirements

THE IMPLEMENTATION DETAILS INCLUDE:

-Restructuring the class data

-Implementation of methods

-Implementation of control

Implementation of associations

Polymorphism: ability of an object to take on many form

Inheritance: which one class derives the properties of another class

Encapsulation: mechanism of wrapping up of data and methods

Data Abstraction: representing only the essential features of data