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1. Objects

   • Methods
     • The actions of an object Has a declaration and a body
     • Declaration
       • Return value
       • Method name
       • List of arguments
     • Body
     • Main
       • A special method that provides and entry point to the application 
       • Public static void
       • String
       • Arguments
   • Fields
     •  Variables.  Attributes of an object
     • Primitives
     • Object references

2. Constructors

   • Constructor name
   • List of arguments
   • Constructor Body
   • New Keyword

3. Reference Variables

   • Null Keyword