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(20); deque.add(25); deque.add(22); System.out.println(deque); // this will print the size of this deque int retval = deque.size(); System.out.println("Size of deque = " + retval); } }