':param acttype.CollectActType type: æäœç±»å
:param datetime.datetime time: è¿è¡æäœçæ¶éŽ
:param Author owner: æ¶èå€¹çæ¥æè
:param Collection collection: æå±æ¶èå€¹
:param Answer answer: æ¶èçç­æ¡ïŒå¯é
:return: CollectActivity'

def __init__(self, type, time, owner, collection, answer=None):

    self._type = type
    self._time = time
    self._owner = owner
    self._collection = collection
    self._answer = answer
