CS619 Final Project Viva Notes

Final Project Viva Preparation Notes

Basic Concepts of OOP

Object-Oriented Programming (OOP) is a type of programming added to php5 that makes building complex, modular and reusable web applications that much easier.

Class :This is a programmer-defined data type, which includes local functions as well as local data. You can think of a class as a template for making many instances of the same kind (or class) of object. Object An individual instance of the data structure defined by a class. You define a class once and then make many objects that belong to it. Objects are also known as instance.

What is the Difference Between a Class and an Object?

a Classes and objects are separate but related concepts. Every object belongs to

class and every class contains one or more related objects. So what exactly are classes and objects and what is the difference between them?

A Class is static. All of the attributes of a class are fixed before, during, and after the execution of a program. The attributes of a class don't change.

The class to which an object belongs is also (usually) static. If a particular object belongs to a certain class at the time that it is created then it almost certainly will still belong to that class right up until the time that it is destroyed.

An Object on the other hand has a limited lifespan. Objects are created and eventually destroyed. Also during that lifetime, the attributes of the object may undergo significant change. A class is the core of any modern Object Oriented Programming language Class is a blueprint of an object that contains variables for storing data and functions to performing operations on these data.

Object:

Objects are the basic run-time entities in an object oriented system. They may represent a person, a place or any item that the program has to handle.

" Object is a Software bundle of related variable and methods. " “Object is an instance of a