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1. Decoupling the complex relationship between the request sender and N receivers, you don't need to know which node in the chain can process your request, so youA world in which all evil cannot invade is naturally a beautiful world in which people strive optimistically. Naturally, people living in such a world will have courage, struggle and endure.小心放好u盘后，吕文心说道：因为电视剧电影输入人气，《第一次亲密接触》和《白发魔女传》上下两册这三本书的总销量已经达到了200多万册，而且相信这几个月还能增加几十万册。也不知是胡家作恶多端、天降报应呢，也不知是黄豆和红椒这对表兄妹自小一块玩大、心有灵犀呢：两人见那随从持剑杀来，竟是毫不把人命放在眼里，对视一眼，不知怎么一让一拐，闪避开来，那胡钰就迎向宝剑。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!　　花与德几经波折，共赴患难后终情愫渐生，惜此时德因营救反清义士而被补下狱，身陷险境……