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(1); deque.add(2); deque.add(3); // adding elements using push() method deque.push(4); deque.push(5); System.out.println(deque); } }