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久仰大名。小葱笑道：师傅师伯不要多想。饭后，陈老太太立即催促儿子儿媳赶快走，说早些去，能占一个好位置，因为今天人肯定很多。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:It began in England in the second half of the 19th century. It was introduced into the European continent in the 1920s and then widely spread in America, Asia and other countries.这时板栗和葫芦也进来了，田夫子止住几人争吵，让他们继续辩驳男女到底是不是一样重要。