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(1); deque.add(2); deque.add(10); System.out.println(deque); // finding size of this deque int retval = deque.size(); System.out.println("Deque consists of " + retval + " elements"); deque.clear(); retval = deque.size(); System.out.println("Now, deque consists of " + retval + " elements"); } }