ConcurrentLinkedDeque.size()

// Java Program to demonstrate the
// size of ConcurrentLinkedDeque
 
import java.util.concurrent.*;
 
class ConcurrentLinkedDequeDemo {
    public static void main(String[] args)
    {
        // Create a ConcurrentLinkedDeque
        // using ConcurrentLinkedDeque() constructor
        ConcurrentLinkedDeque<Integer>
            cld = new ConcurrentLinkedDeque<Integer>();
 
        // Adding elements to the collection
        cld.addFirst(12);
        cld.addFirst(70);
        cld.addFirst(1009);
        cld.addFirst(475);
 
        // Displaying the ConcurrentLinkedDeque
        System.out.println("ConcurrentLinkedDeque: "
                           + cld);
 
        // Calculate size
        int size = cld.size();
 
        System.out.println("Size of the collection is: "
                           + size);
    }
}

ConcurrentLinkedDeque: [475, 1009, 70, 12]
Size of the collection is: 4