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Two - Stage Creation
Coming back to NSObject’s base class method :
The +alloc and +allocWithZone: methods each return a
pointer to a newly allocated block of memory large enough to store an
instance of the class that executed the method.
The allocated memory contains zeros except for the one instance
variable, isa, that all Objective-C objects are required to have.The
isa variable is automatically initialized to point to the class object
that allocated the memory and is the tie-in to the Objective-C language
run- time that enables the instance to receive messages such as -init
that are used to complete initialization.
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