JavaOOPSConcepts by an expert trainer

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In object oriented programming language construction is done by constructing objects. We use objects to interact with each other to send and receive messages. A program can have number of objects and each object can be given a different task.
OOPS concepts includes:
1)Data Abstraction

2)Encapsulation

3)Polymorphism

4)Inheritance

Data Abstraction:

Abstraction refers essential features without including the background details or explanations. Classes uses the concept of Abstraction.

Encapsulation:
Storing data and objects as a single unit is called encapsulation. Data of one object cannot be accesible to other objects. Methods defined in class only can access the code defined in the class.

Inheritance:
Inheritance is the process where the objects of one class acquires the features of another class. Inheritance provides reusability like adding additional features to a class with out modifying it. 

Polymorphism:
Polymorphism means ability to take more than one form. The behaviour depends on the data types uses in the operation. Polymorphism is achieved through inheritance.