Question 4 1 pts public interface Stack ( Returns the number of elements in the

Question

Question 4 1 pts public interface Stack ( Returns the number of elements in the stack. int sizeO 158 * Tests whether the stack is empty. 95/ boolean isEmpty); Inserts an element at the top of the stack. void push(Object e); * Returns, but does not remove, the element at the top of the stack, or null if the stack is empty Object top) * Removes and returns the top element from the stack, or null if the stack is empty. Object pop) Consider the following sequence of operations on a Stack that begins empty. Give the return value for each line. If it causes an error, then write ERROR.

Explanation / Answer

pop() : B

as we inserted A ,B so if ew pop we will get the Last inserted element which is B

top() now have only 1 element which is A

pop() : we have A,C in statck so we will get C as it last inserted element

pop() now we have A only so we will get A

pop() : returns null as the stack is empty

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