This document discusses key concepts in object-oriented programming including classes, objects, methods, abstraction and encapsulation, inheritance, and polymorphism. It defines a class as a user-defined data type that includes attributes. An object is an instance of a class that has behaviors, holds information, and can interact with other objects. A method defines the behavior of an object. Abstraction and encapsulation involve hiding details and binding data and functions together. Inheritance allows a class to acquire properties of its parent class. Polymorphism allows different behaviors in different instances.

1. (OBJECT ORIENTED PROGRAMMING)
BY
RANJITH.A.J

2. CLASS
OBJECT
METHOD
ABSTRACTION AND ENCAPSULATION
INHERITANCE
POLYMORPHISM
MESSAGE PASSING

3. CLASS
A class is a user defined data type. It include attributes.A
class is a well defined collection of objects. Here we consider
a class
Here there are two main class
customer and item and its attributes
are id,name,address,price etc..

4. Objects are the real world entity that have behaviours,that
hold information,and that can interact with one another
for example customer is a base class and its
object is
"CUSTOMERSERVICE"
object
In customerService have some property
values that are name ,id,and address here the
customerservice class is a instance of base
class customer

5. A methode is a behaviour of an object

6. Abstraction is the process of hiding background details and show only
its essential features. Encapsolution is the process of data and its
function bind together with in a unit it can avoid unauthorized access on
data

7. Inheritance in java is a mechanism in which one object acquires all the properties
and behaviors of parent object. Inheritence is very useful because the inheritence
help us to avoid reuse of codes,..Types of inheritenmce in java are given below
Multiple inheritence not supported in java because it is more complexity

8. Polymorphism is the process of exibiting diffrent behaviour
in different instances. There are two types of polymorphism
that are operator overloading and function overloading