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(3); deque.add(1); deque.add(25); deque.add(4); System.out.println(deque); // this will print the size of this deque int retval = deque.size(); System.out.println("Size of deque = " + retval); } }