Проверка Очереди

public class Main {
    public static void main(String args[]) {
        QueueY a = new QueueY();
        for (int i = 0; i<10; i++){
            a.Enqueue(i);
        }
        System.out.println(a.size());
        for (int i = 0; i<10; i++){
            System.out.println(a.Dequeue());
        }
    }
}