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This chapter is the last lecture on design patterns. It will talk about the third design pattern-behavioral pattern, with a total of 11 types: policy pattern, template method pattern, observer pattern, iterative sub-pattern, responsibility chain pattern, command pattern, memo pattern, state pattern, visitor pattern, intermediary pattern and interpreter pattern. I have been writing about design patterns for a long time. At last it's halfway through, Writing a blog post is a very time-consuming thing, Because I have to be responsible for the readers, Whether it's graphs, codes, or representations, Everyone hopes to write it as clearly as possible so that readers can understand it. I think both I and the readers hope to see high-quality blog posts come out. Starting from myself, I will stick to it and update it continuously. The continuous motivation comes from the continuous support of readers and friends. I will do my best to write every article well! I hope everyone can give opinions and suggestions continuously and jointly create a perfect blog post!People with type B blood are like veteran cadres, They are usually silent and silent, and they don't make girls happy with glib words, but this will also attract the attention of many girls who like to be more down-to-earth. Although they don't say beautiful words to make girls happy, what they say is very reliable and true, making people feel very safe.故事主要围绕着活泼可爱的5岁小男孩顾得白一家发生的琐事。一家三口生活在天辰小区的一间小蜗居里，房子不大，却爱意满满，每天都会闹出许多小笑话。每天都会听到妈妈叫顾得白起床的怒吼声，爸爸五音不全的练嗓子。顾得白喃喃地低语声。这些声音交织在一起从这小小的蜗居里飘洒出去，在这座城市的上空描绘出彩虹。一名前黑客被迫闯入高级银行机构，另一名男子必须设法闯入装有诱杀装置的大楼，以使这名年轻人摆脱困境。哼，她就知道，要是张家三姑娘不在，秦旷会跑去街上瞧热闹？想了解什么，让随从跑一趟就是了，何必亲自去。