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Interface Design by Bill Venners
Use concrete classes to say "What objects are."


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What Objects Are

Talk about how you alot responsibilities to different objects and then give them names, method signatures, and semantic contracts.

An Account Object

Type safety means that the data on the heap that represents an Account object can only be accessed in ways compatible with its Accountness.

Igor said: "There is less money in the world than pennies in long."

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