OOP Concepts

today we are going to study about OOP concepts. Object oriented programming language is based on the concept of objects. Object oriented concepts are,

• Object
• Class
• Inheritance
• Polymorphism
• Encapsulation

object

an entity which has state(properties) and behavior is known as an object. it may be anything and may be logical or physical.Object is an instance of a class.

ex :- dog,pen,tree,car,mother,...etc.

as we told state and behavior let's discuss it with an example

class

class is a blue print or template of object. Which is a group of objects have similar properties.

inheritance

when one object acquires all or some properties of another object it is inheritance. That may the child will acquire their parents properties.

as an example let's take the supper class as vehicle. A vehicle has colour,brand,speed,auto/manual etc. Car may be a sub class of above supper class. That means car has common properties in vehicle class and there may be unique properties also.

here we use extend as the key word in inheritance.

if car class wants to inherit vehicle class it should noticed as,

                                                    class car extends vehicle  {}

Polymorphism

When one task is performed by different ways is known as polymorphism.

In java, we use method overloading and method overriding to achieve polymorphism. And I am going to describe them in later.

Encapsulation

binding or wrapping all the details in to one is known as encapsulation.

A class will encapsulates all the fields and functions that are performed on the fields of a class.

in this post I have describe only the simple meanings of oop concepts and in next posts I am going to show them details with example codes.

Thank you.......!