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In object-oriented programming technique, we design a program using objects and classes.
Object is the physical as well as logical entity whereas class is the logical entity only.
Object in Java
 
An entity that has state and behavior is known as an object e.g. chair, bike, marker, pen, table, car etc. It can be physical or logical (tangible and intangible). The example of intangible object is banking system.
An object has three characteristics:
⦁    state: represents data (value) of an object.
⦁    behavior: represents the behavior (functionality) of an object such as deposit, withdraw etc.
⦁    identity: Object identity is typically implemented via a unique ID. The value of the ID is not visible to the external user. But, it is used internally by the JVM to identify each object uniquely.
For Example: Pen is an object. Its name is Reynolds, color is white etc. known as its state. It is used to write, so writing is its behavior.
Object is an instance of a class. Class is a template or blueprint from which objects are created. So object is the instance(result) of a class.
Object Definitions:
⦁    Object is a real world entity.
⦁    Object is a run time entity.
⦁    Object is an entity which has state and behavior.
⦁    Object is an instance of a class.
Class in Java
A class is a group of objects which have common properties. It is a template or blueprint from which objects are created. It is a logical entity. It can't be physical.
A class in Java can contain:
⦁    fields
⦁    methods
⦁    constructors
⦁    blocks
⦁    nested class and interface
Syntax to declare a class:
⦁    class <class_name>{ 
⦁        field; 
⦁        method; 
⦁    } 

INSTANCE VARIABLE IN JAVA
A variable which is created inside the class but outside the method, is known as instance variable. Instance variable doesn't get memory at com

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