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Java : 

• Java is a programming language originally developed by James Gosling at Sun Microsystems (which has since merged into Oracle Corporation) and released in 1995 as a core component of Sun Microsystems' Java platform.
• Java applications are typically compiled to bytecode (class file) that can run on any Java Virtual Machine (JVM) regardless of computer architecture. 

Object :  An object is a simulation of the real-world entities.
 To work with objects, we should be able to identify three key characteristics of objects:

• The object's behavior— what can you do with this object, or what methods can you apply to it?

• The object's state— how does the object react when you apply those methods?

• The object's identity— how is the object distinguished from others that may have the same

behavior and state?


Class :
  Classes act as templates for the objects. Classes are structures that holds the member fields and member functions of the object.

• Java Features
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• Java object class Introduction
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• ListIterator, Enumerator, Iterator
• Collection Framework
• this keyword in Java