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23. Code: Stupid taste (random code).　　徐百九越深入地研究刘金喜，就越觉得他也许并不是一个罪大恶极的人，徐百九开始相信“他要么是一个伪装高手，要么便是真的改邪归正了。”为了结束查案，徐百九不断地袭击刘金喜，试图逼他用武功来反抗，但每每都不如愿。刘金喜在此过程中严重受伤，迫使徐百九对他的怀疑有所动摇。正当所有的证据都让徐百九的推并且，潮的妹妹澪说“姐姐去世前3天看到了影子”……！？Now, let's imagine why these "checkpoints" are called "chains" in iptables. As we know, The purpose of a firewall is to match "rules" for passing messages, Then execute the corresponding Action, So, when the message passes through these checkpoints, You must match the rules on this level, However, there may be more than one rule on this level, But there are many rules, When we put these rules in a chain, A "chain" has been formed. Therefore, we imagine each "checkpoint" as shown in the following figure. In this way, it is more appropriate to call them "chain". Each message passing through this "checkpoint" must match all the rules on this "chain". If there are qualified rules, the corresponding actions of the rules will be executed.@ Song YiEach object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.何苦呢？杨长帆起身追去。