Java tutorial
import java.util.ArrayDeque; import java.util.Deque; public class Main { public static void main(String[] args) { Deque<Integer> deque = new ArrayDeque<Integer>(8); deque.add(15); deque.add(30); deque.add(20); deque.add(18); System.out.println(deque); int retval = deque.getFirst(); System.out.println("Retrieved Element is = " + retval); } }