Java – OOP Features

Introduction to Object oriented programming:

• Java is Object Oriented Programming language.
• OOPs is the concept of defining objects and establish communication between them.
• The Main principles of Object-Oriented Programming are,
• Encapsulation
• Inheritance
• Abstraction
• Polymorphism

Note: We implement Object-Oriented functionality using Classes and Objects

Class: Class contains variables and methods. Java application is a collection of classes

Syntax	Example
class ClassName {             Variables ;                &             Methods ; }	class Account {             long num;             String name;             double balance;             void withdraw(){                logic;             }             void deposit(){                logic;             } }

Object: Object is an instance of class.Instance (non static) variables of class get memory inside the Object.

Syntax:  ClassName  reference = new ClassName();

Example:  Account  acc = new Account();

Note: Class is a Model from which we can define multiple objects of same type