Could anybody please tell me what is the advantage of declaring variables to be of an interface rather than class type?

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My computer science professor will probably yell at me for saying this, but I'm not sure other than having an interface for a class is the same advantage as having like a prototype for a method.

as of September 2003 Computer Science standards have switched vocabulary terms "prototypes" are now known as "signatures", "functions" are "methods" and so on ;)

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