What is OOPs concepts in java ?

In this page, we will learn about basics of OOPs. Object Oriented Programming is a paradigm that
provides many concepts such as inheritance, message passing,abstraction,data hiding
data binding etc. Simula is considered as the first objectoriented programming language.
The programming paradigm where everything is represented as an object,is known
truly object-oriented programming language. Smalltalk is considered as the first truly
object-oriented programming language.

OOPs (Object Oriented Programming System):

Object means a real word entity such as book,pen,  chair,table(mostly noun) etc.
Object-Oriented Programming is a methodology or paradigm to design a program using classes and objects. It simplifies the software development and maintenance
by providing some concepts:

 > Object
 > Class
 > Inheritance
 > Polymorphism
 > Abstraction
 > Encapsulation

Object:

Any real world entity that has state and behavior is known as an object.For example: book, pen, keyboard, car,mouse etc. It can be
physical and logical entity .

Class:

Collection of similar type of objects is called class. It is a logical entity.

Inheritance:

When one object acquires all the properties and behaviours of parent object i.e. known as inheritance. It provides code reusability. It is used to achieve runtime polymorphism.

Polymorphism:

When one task is performed by different ways i.e. known as polymorphism. For example: to draw something e.g. shape or rectangle etc.

Note: In java, we use method overloading and method overriding to achieve polymorphism.

Abstraction:

Hiding internal details and showing functionality is known as abstraction. For example: phone call, we don't know the internal processing.
In java, we use abstract class and interface to achieve abstraction.

Encapsulation:

Binding (or wrapping) code and data together into a single unit is known as encapsulation. For example: capsule, it is wrapped with different medicines.

A java class is the example of encapsulation. Java bean is the fully encapsulated class because all the data members are private here.

We will learn about these concepts in details one by one in other posts.

Advantage of OOPs over Procedure-oriented programming language:

 >1 OOPs makes development and maintenance easier where as  in Procedure-oriented programming      language it is not easy to manage if code grows as project size grows.
 >2 OOPs provides data hiding whereas in Procedure-oriented prgramming language a global data            can be accessed from anywhere.
 >3 OOPs provides ability to simulate real-world event much more   effectively. We can provide the        solution of real word problem if we are using the Object-Oriented Programming language.

What is difference between object-oriented programming language  and object-based programming language?

Object based programming language follows all the features of  OOPs except Inheritance. JavaScript and VBScript are examples  of object based programming languages.