Question

What does the following function do?

public T doSomething() throws EmptyCollectionException{

      if (isEmpty())

            throw new EmptyCollectionException(“Stack”);

      T result = top.getElement();

       top = top.getNext();

       count--;

       return result;

}

Select one:
a. isEmpty()
b. Push()
c. Pop()
d. Peek()

Answer 1

c. Pop()

Explanation:
-------------
T result = top.getElement(); this gets the top element
and then    top = top.getNext(); removes the top element of the collection
count--; decreases the size of collection
return result; returns the top element which was removed.
this operation is clearly pop operation.