OOP is a model used for organizing based on Objects rather than actions & data rather than logic for Programming Languages such as C, C++, Java.

This Paradigm provides many concepts in order to do this, They are inheritance, data binding, Polymorphism etc.

Smalltalk is the first truly object oriented programming language.

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Benefits of OOP Concepts


OOP Concepts has several benefits for the developer as well as the users. This object oriented programming concept contributes in resolving many problems associated with development.

  • Can Eliminate Redundant Code
  • Existing class can be used
  • Data hiding helps to build secure program
  • Easier to develop larger programs
  • Ability to stimulate real world program
  • Can be upgradable from small program to large programs

OOPS Concepts in Java


OOPS Concepts

 

  • Class
  • Object
  • Polymorphism
  • Encapsulation
  • Inheritance
  • Working with Super Classes & Sub Classes
  • Super Keyword
  • Abstraction
  • Abstract Classes
  • Interfaces
  • String Methods
  • Collections
  • Exception Handling

Read more to get the detailed understanding of the important concepts such as Inheritance, Polymorphism, Encapsulation.

Inheritance


Inheritance is defined as, an object which has all the properties and nature of another object. It is an important feature in OOP concepts.

  • Can use already written class
  • Extend the existing class
  • Code Reusability

Different Types of Inheritance


  • Single Inheritance
  • Multiple Inheritance
  • Multilevel Inheritance

 

Single Inheritance

An easy understandable key feature of OOP in Java, The architectural diagram below describes you about Single Inheritance. Class B which got inherited from Class A. The dervied class B has all the features and characters as same as Class A which is its parent class.
oops concepts

Multiple Inheritance

Multiple Inheritance which is slightly different from the previous one, It consists of two base classes from which a new class is derived. This concept is not mostly used in software projects, also the new programming languages such as C++, Java does not support Multiple Inheritance.
OOPS Concepts

Multilevel Inheritance

In this OOP Concept a new class is derived from already exisitng class which got derived from the base class, Means Class C got derived from Class B which is inherited from Class A. Class B is the parent class for Class C and child class for Class A.
Multilevel Inheritance - OOPS concepts

Hybrid Inheritance

Hybrid Inheritance is a combination of both Single and Multiple Inheritance, Check the diagram for detailed understanding. In Java Hybrid Inheritance is acheived by using interfaces.
OOPS Concepts

Polymorphism


One of the easy concepts in Java is Polymorphism. Poly means many, Morphos means forms, thus a single task is performed by different ways it is known as Polymorphism. Here in Java Polymorphism is achieved by using method overloading and overriding.

It is clear that Methods having the same name works differently in different context. It is implemented by two different ways, They are

  • Static Polymorphism
  • Dynamic Polymorphism

Encapsulation


Binding the data and code in a single unit is called as Encapsulation. It also provides security to keep them safe from changes.

  • Variables must be declared as Private
  • Setter and Getter methods to modify and view the variables

 

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