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Mobile phone address book memos, operating system backup points, database backup, etc. in life are all applications of memo mode. Memorandum mode captures the internal state of an object without destroying the encapsulation and saves the state outside the object, so that the object can be restored to its original state later. The specific structure diagram is as follows:直到此时，周勃才知道自己上当了，知道一切都完了。At present, Cao Zaixian has issued a statement, made a public apology and quit all the TV plays he is playing.National Highway 207 and Railway Station此剧讲述三个自高中起为挚友的女人，在面临中年危机时各自为了过着全新的生活而奋斗的故事。As the name implies, the decoration mode is to add some new functions to an object, and it is dynamic. It requires the decoration object and the decorated object to realize the same interface. The decoration object holds an instance of the decorated object. The diagram is as follows: