static public void Main()
{
ObjectStructure objectStructur = new ObjectStructure();
ConcreteVisitorA concreteVisitorA = new ConcreteVisitorA();
ConcreteVisitorB concreteVisitorB = new ConcreteVisitorB();
objectStructur.VisitElementX(concreteVisitorA);
objectStructur.VisitElementX(concreteVisitorB);
objectStructur.VisitElementY(concreteVisitorA);
objectStructur.VisitElementY(concreteVisitorB);
}