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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!还有一个就是刘邦派了郦食其南下，还声称要将吕雉的族妹嫁给越王尹旭为妃子。Centos7, The service is no longer started using init-style scripts, Instead, the unit file is used, Therefore, commands like service iptables start can no longer be used in centos7, Therefore, service iptables save cannot be executed. At the same time, firewall is used to replace the original iptables service in centos7, but don't worry, we just need to install iptables and iptables-services through yum source (iptables are usually installed by default, but iptables-services are not installed by default in centos7). After installing iptables-services in centos7, the rules can be saved by the service iptables save command, as in centos6, and the rules are also saved in the/etc/sysconfig/iptables file.铁心兰是不是有些不识好歹，花无缺对她多好啊，她竟然还好想着小鱼儿。The world is very complicated, full of phenomena, facts and various viewpoints (insights, lies and deception). We need to extract the consistency behind them in order to quickly understand and understand the world. This consistency is the dimension in the classification. The classification of the three worlds is just to find a classification method for countries that we have not used before. The traditional classification of countries is based on geographical location (five continents), population (large and small countries) and development stage, while the three worlds are classified according to their relationship.两国交锋，凭着三寸不烂之舌成就大事的文臣不在少数，王穷并非狂言。