Java OOPS Basics

Java OOPs Concept

          This tutorial will help you to understand about Java OOP’S concepts with examples. Let’s discuss about what are the features of Object Oriented Programming. Writing object-oriented programs involves creating classes, creating objects from those classes, and creating applications, which are stand-alone executable programs that use those objects. A class is a template, blueprint,or contract that defines what an object’s data fields and methods will be. An object is an instance of a class. You can create many instances of a class.

Note : In this page, we will learn about basics of OOPs. Object Oriented Programming is a paradigm that provides many concepts such as inheritance, data binding,polymorphism etc.

"Object Oriented Programming Concepts"

There are 6 object oriented programming concepts in Java
which are given below.

  1. Class
  2. Object
  3. Encapsulation
  4. Polymorphism
  5. Inheritance
  6. Abstraction


Class is a collection of similar type of objects which have
some common properties.

Note: for more detail about class click here


Object is any real world entity which have physical
existence either living or non-living. 
Collection of objects is called class. It is a logical entity.

Note: for more detail about object click here


The wrapping up of data and functions into a single unit (class)
is known as encapsulation

Note: for more detail about Encapsulation click here


Hiding the complexity and showing the functionality is known
as abstraction. Showing the essential data and hiding the non essential data.

Note: for more detail about Abstraction click here

Polymorphism is used to assume the ability of several
different forms. Or we can say performing one task in different ways.

Note: for more detail about Polymorphism click here


Creating a new class form an existing class is known as
inheritance. It provides code reusability.

Note: for more detail about Inheritance click here

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 programming 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.
  4) Objects are modeled on real world entities

 5) OOPS enables modeling complex systems of real world into      manageable software solutions.

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

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

Difference between Procedure Oriented Programming (POP) & Object Oriented Programming (OOP)

Programming techniques

a) Unstructured Programming (Assembly language programming)

b) Procedural Programming (Assembly language, C         programming)

c)  Object Oriented Programming (C++, Java, Smalltalk, C#,          Objective C)

Unstructured Programming

This consists of just writing the sequence of commands or statements in the main program, which modifies the state maintained in Global Data. Example: Assembly Language programs.

Limitations of Unstructured Programming
a) The data is global and code operates on it
b) As the size of code increases, maintenance is a problem
c) Does not have independent data for processing
d) The concept of local variables did not exist
e) Reusability of code was not supported

Assembly Language: Similar to machine language, but provides names for numeric instructions present in the machine language, making it easy for the programmer.

Machine language is the language which a Central Processing Unit (CPU) of a computer understands and consists only of numbers.

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