Knowing the Difference Between the Interface and the Implementation
As we saw in Chapter 1, one of the keys to building a strong OO design is to understand the difference between the interface and the implementation. Thus, when designing a class, what the user needs to know and what the user does not need to know are of vital importance. The data hiding mechanism inherent with encapsulation is the means by which nonessential data is hidden from the user.
Caution
Do not confuse the concept of the interface with terms like graphical user interface (GUI). Although a GUI is, as its name implies, an interface, the term interfaces, as used here, is more general in nature and is not restricted to a graphical interface.
Remember the toaster example ...
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