Which operations from the array list data structure could be used in the implementation of the push and pop operations of a stack data structure?
i.addLast
II.addFirst
III.removeFirst
A)I and III
B)I and II
C)II and III
D)None of the above

Question

Quizplus · Accepted Answer

The push operation in a stack adds an element to the top of the stack, which corresponds to adding an element to the beginning of the array list. Therefore, addFirst operation can be used to implement the push operation.
The pop operation in a stack removes and returns the top element from the stack, which corresponds to removing and returning the first element of the array list. Therefore, removeFirst operation can be used to implement the pop operation. 
addLast operation cannot be used to implement push and addFirst cannot be used to implement pop.

Which Operations from the Array List Data Structure Could Be