Java Stack Class Quiz

What is the primary principle on which the Stack class in Java is based?

• First-in-first-out (FIFO)

• Last-in-first-out (LIFO)

• First-in-last-out (FILO)

• Last-in-last-out (LILO)

Which method is used to add an element to the top of the stack?

• add()

• insert()

• push()

• append()

Which method is used to remove the top element from the stack?

• discard()

• pop()

• delete()

• remove()

What does the peek() method do in a Stack?

• Returns the top element without removing it

• Adds an element to the top

• Checks if the stack is empty

• Removes the top element

Which interface does the Stack class implement?

• Queue

• List

• Set

• Map

What will the search() method return if the element is not found in the stack?

• null

• 0

• -1

• An exception

What is the output of the following code snippet? Stack stack = new Stack<>(); stack.push(1); stack.push(2); System.out.println(stack.pop());

• 2

• An exception

• 1

• null

Which method checks if the stack is empty?

• empty()

• checkEmpty()

• hasElements()

• isEmpty()

What is the return type of the pop() method in the Stack class?

• void

• boolean

• int

• Object

Which of the following is NOT a method provided by the Stack class?

• enqueue()

• peek()

• pop()

• push()