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反正今天兴趣不大。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:Report秦枫微笑点头，说黄豆脑子转得快。《特摄GAGAGA》是NHK电视台于2019年1月18日开播的电视连续剧，由小芝风花主演，木南晴夏、森永悠希、武田玲奈、寺田心、松下由树等人共同演出。以黑川翔子的报导文学改编,在一所被称为底层学校的县立高中,一年内多达相当一个班的40名学生辍学,教师们努力解决现代社会两极化下中学生面临的各种问题,描述基于一个关于新老师的冲突和成长的真实故事。…,各国大军东归之后，魏豹从魏王变成了西魏王，故都大粱进入了西楚国的疆域之中。