When the client attempts to either retrieve or remove an item from an empty stack, our stacks return null. An alternative action is to throw an exception.
a. Modify the interface StackInterface so that an EmptyStackException is thrown in these cases. (This exception is defined in the package java.util.)
b. Modify the array-based implementation of the stack to conform to your changes to StackInterface. Write a program that demonstrates the modifications.
c. Repeat Part b for the linked implementation of the stack.
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