Java OCA OCP Practice Question 2125

Question

Choose the correct option based on this 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?
    }/*w  w w. java2s .c  om*/
}
  • 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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