Programming Problem in Chapter describes the ADT traversable stack. In addition to the standard stack operations— isEmpty, push, pop, and peek—a traversable stack includes the operation traverse. The traverse operation is an iterator that begins at the bottom of the stack and displays each item in the stack until it reaches the top of the stack.
Alternatively, you could create a StacJclterator class based on the Stackinterface, as given in Chapter 7. However, the iterator would then only have access to the methods contained in the interface, such as push, pop, and peek. Since the iterator should not change the contents of the stack, the implementation would be quite inefficient.
The stacklterator class would be more efficient if it had access to the underlying stack implementation (eidier StackArrayBased or StackReferenceBased). Implement a Stack class within a package that provides package access to the stack’s underlying data structure. Then, in the same package, create a Stacklterator class diat uses this new stack class.
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