void Start()
    {
        Observer1 obj1 = box1.GetComponent <ConcreteObserver3>();
        Observer1 obj2 = box2.GetComponent <ConcreteObserver3>();
        Observer1 obj3 = box3.GetComponent <ConcreteObserver3>();

        _notiHandler += new NotiHandler(obj1.OnNotify);
        _notiHandler += new NotiHandler(obj2.OnNotify);
        _notiHandler += new NotiHandler(obj3.OnNotify);

        time = 2f;
    }
    private void Start()
    {
        myNum = 10;

        Observer obj1 = new ConcreteObserver1(this.gameObject);
        Observer obj2 = new ConcreteObserver2(this.gameObject);

        //AddObserver(obj1);
        //AddObserver(obj2);

        _notiHandler += new NotiHandler(obj1.OnNotify);
        _notiHandler += new NotiHandler(obj2.OnNotify);
    }