Java OCA OCP Practice Question 3106

Question

Consider the following program: 

import java.util.*;

public class Main {
        public static void main(String []args) {
               Deque<Integer> deque = new ArrayDeque<>();
               deque.addAll(Arrays.asList(1, 2, 3, 4, 5));
               System.out.println("The removed element is: " + deque.remove()); // ERROR?
        }
}

Which one of the following correctly describes the behavior of this program?

  • a) When executed, this program prints the following: "The removed element is: 5".
  • b) When executed, this program prints the following: "The removed element is: 1".
  • c) When compiled, the program results in a compiler error of "remove() returns void" for the line marked with the comment ERROR.
  • d) When executed, this program throws InvalidOperationException.


b)

Note

The remove() method is equivalent to the removeFirst() method, which removes the first element (head of the queue) of the Deque object.




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