def __init__(self, type, time, owner, collection, answer=None):
self._type = type<EOL>self._time = time<EOL>self._owner = owner<EOL>self._collection = collection<EOL>self._answer = answer<EOL>
创建收藏夹操作类实例

        :param acttype.CollectActType type: 操作类型
        :param datetime.datetime time: 进行操作的时间
        :param Author owner: 收藏夹的拥有者
        :param Collection collection: 所属收藏夹
        :param Answer answer: 收藏的答案，可选
        :return: CollectActivity