Java tutorial
import java.util.ArrayDeque; import java.util.Deque; public class Main { public static void main(String[] args) { ArrayDeque<Integer> deque = new ArrayDeque<Integer>(8); deque.add(25); deque.add(2); deque.add(1); deque.add(18); // this will retrieve head of the queue int retval = deque.peek(); System.out.println("Retrieved Element is " + retval); System.out.println(deque); } }