Object Oriented Programming (OOP)

Introduction

• Object oriented programming is a replacement for structural programming.
• It is a new way of organizing and developing programs.
• All programming languages are not suitable to implement OOP concepts easily. C++ is a one of most popular OOP language today.
• The latest one is JAVA ,  a pure object oriented language. But still you can write structural programs with JAVA.  
• OOP allow us to decompose a problem in to a number of entities called objects and then build data and function(methods) around these entities.

Benefits of OOP

• Eliminate redundant code.
• Save time and high productivity.
• Secure program.
• Possible to have multiple objects.
• Software complexity can be easily managed.

Class

A class describes the properties and behavior of common set of entities.

Classes are not REAL  .

Object

An object is an instance of a class. From one class we can create many instances.

Object are REAL

They are the basic runtime entities in program.

Ex:-

class Student{

            String name;

            String  address;

            Void study(){

                        System.out.println(“Studying”);

}

Void getDetails(){

            System.out.println(“My name is ”+name);

            System.out.println(“I live in  ”+address);

}

            public static void main(String args[]){

                        Student s1 = new Student();                

                        S1.name = “Saman”;

                        S1.address = “Maharagama”;

                        Student s2 = new Student();

                        S2.name = “Nuwan”;

                        S2.address = “Piliyandala”;

                       

                        S1.study();

                        S1.getDetails();

                        S2.study();

                        S2.getDetails();

}

}

You can create many objects according to the designed template. Simply that is OOP.

-Thank you-