Question: write a java program that: When the client attempts to either retrieve or remove an item from an empty stack, our stacks throw an exception.

write a java program that: When the client attempts to either retrieve or remove an item from an empty stack, our stacks throw an exception. An alternative action is to return null .
a. Modify the interface StackInterface so that null is returned in
these cases.
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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