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他叉开话题问道：看了赎物清单，你好像一点也不在乎，是不是你们根本不缺那些东西？青鸾公主摇头道：这些东西，恐怕要搬空了南雀国现有的国库。-Execute methods through events胡镇一扫来时的得意，耷拉着一张贴膏药的脸。Make a template and define the calling order and method in the template. Different subclasses implement methods with their own characteristics, and then access the calling methods of subclasses when accessing externally.The next four patterns, including this pattern, are all the relationships between classes and do not involve inheritance. When learning, you should remember induction and the diagram at the beginning of this article. The observer mode is well understood, similar to email subscription and RSS subscription. When we browse some blogs or wikis, we often see RSS icons. This means that when you subscribe to the article, you will be notified in time if there are subsequent updates. In fact, in a nutshell, when an object changes, other objects that depend on the object will be notified and will change with it! Objects are a one-to-many relationship. Let's look at the diagram first:其中拥有「世界最强的魔法部队」STARS的北美利坚合众国（USNA）感觉到日益强烈的危机感，为了揭露未观测的战略级魔法以及使用这一魔法的魔法师的真面目，而积极地在暗中行动。