public void MoveandRemoveFallingObjects(){
        for (int i=0; i < fallingObjects.size();i++)
        {
             RainDrop rainDrop = (RainDrop) fallingObjects.get(i);
            if(rainDrop.getVisible()==true)
                rainDrop.move(-1);
            else
               fallingObjects.remove(i);
        }
    }