Objects and Classes

OOPs (Object oriented programming) is based on two concepts: -

Objects and Classes

Objects and classes provide a better way to design the system.

Objects :-

There are three basic properties of an object-

• State :- state represent the data  in the object. it can't change after creation.

• Behavior :- Behavior represent the method in the objects by which the object can be used. Behavior can change.

• Identity :- it is the property of object that distinguishes it from other objects.

For Example- electric fan (real world entity) has parts like motor, switch etc known as its state. We can change  fan behavior ON or OFF  by pressing power switch.

Classes :- 

Class is a blueprint from which an object is constructed. It is a group of objects with common attributes. Class contains-

• members of class
• method

Structure of Class :-

class <class_name>                      {                          members of class                          methods                      }

Sample of a class :-

class Example                {                    String name;                     int age;                    void display()                    { }                    void hide()                     { }                }