Java OCA OCP Practice Question 3284

Question

Consider the following program and predict the output: 

import java.util.*;

public class Main {
     public static void main(String []args) {
             Deque<Integer> deque = new LinkedList<>();
             deque.add(10);/*from  w ww. j  av  a 2 s  .com*/
             deque.add(20);
             deque.peek();
             deque.peek();
             deque.peek(); //#1
             System.out.println(deque);
     }
}
  • a) [10, 20]
  • b) [20, 10]
  • c) []
  • d) NoSuchElementException thrown when executing the line #1.


a)

Note

The method peek() retrieves an element from the head of the Deque and returns, but does not remove the element.

Hence, there will be no impact on the Deque.




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