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Singleton&PrototypeScope

Singleton scope:
==============================
-> If scope is set to singleton, the Spring IOC container creates exactly one instance of the
    object defined by that bean definition. The single instance is stored in a cache of such
    singleton beans, and all subsequent requests and references for that named bean return
    the cached object.


Prototype scope:
=============================
-> If scope is set to prototype, the Spring IOC container creates new bean instance of the
     object every time a request for that specific bean is made.

Use of prototype scope is: Where requirement is state-full beans are there.
Use of singleton scope is:  Where requirement is state-less beans are there.

-> If no scope is specified with bean definition, Singleton is the default scope.

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