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Use ExampleThe observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:还在为苦追男神而发愁？ 做独立的自己，让男神倒追。 一切方法尽在——追夫36计：老公，来战！Http://www.jiemian.com/article/2081896.htmlTreasure Pearl Attribute:小葱就对随赵清进来的一个小女娃——叫九儿的，约莫七八岁，是医学院的学生——低声说了几句，她便抿嘴一笑，转身跑出去了。Separate the internal representation of the product from the construction process of the product. Q: How can they be separated? Answer: Don't put the construction process of the product in the product class, but the builder class is responsible for the construction process, and the internal representation of the product is put in the product class, so it is not separated.