[問題] 關於物件導向問題
想請問一下各位大大
最近看一本書:寫給SA的UML/MDA實務手冊
裡面的循序圖有個例子
有三個物件,A call B,B call C
然後C回傳B,B再回傳A
書上寫說可以這樣
A call B,B不callC,反而回傳C的位址給A
讓A自己去call C
書上是寫說下面的寫法可以維持物件的封裝性
但是我想破頭都想不出來,這樣跟物件封裝性有什麼關係
希望各位大大可以指點一下,感恩
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