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We call a collection of rules that have the same functionality a table, Therefore, we can place rules with different functions in different tables for management, and IPTables has already defined four tables for us, each table corresponds to different functions, and the rules we define cannot escape the scope of these four functions. Therefore, before learning IPTables, we must first understand the function of each table.Children. Add (node);Some software developers always want to set up a certain design pattern when designing programs. In fact, this is wrong and they do not really master the idea of design pattern. In fact, many times readers use a certain design pattern, but they just don't know what the name of this pattern is. Therefore, when designing programs, we should use appropriate design patterns according to our own understanding.For example, some common outsourcing companies receive a project, Then the received project may be the person in charge of the project or the manager level of the company. After receiving the project, the manager does not develop it himself. Leave it directly to the project manager for development, The project manager is certainly not willing to develop it himself. Oh, It will hand over the project to the following code farmers to do, So the coder handles it, If the code farmers don't handle it, Then the project may be directly suspended, but after the final completion, the outsourcing company does not know who developed that part of these projects. It does not know or care about it. What it cares about is that the project has been handed over to the outsourcing company and has been developed without any bugs. Therefore, the advantages of the responsibility chain mode lie here:在镇上，四海和水如尘遇见了镇上的首富霍天命（岳华 饰）和他的女儿霍倩瑶（廖碧儿 饰）。在阴差阳错之中，四海和霍倩瑶竟然结为了夫妻。镇上接连发生了数起命案，搅得人心惶惶，四海和水如尘开始了对案件的调查，却发现镇上发生的一切，和他们两人有着千丝万缕的关联。Responsibility chain mode: pay attention to encapsulating object responsibilities, support changes in responsibilities, and realize transaction processing by dynamically constructing responsibility chains.Steve McGarrett（艾历克斯·奥洛林饰）曾经是一位获得过荣誉勋章的海军海豹突击队军官，退役后当上了警察。为了调查父亲的谋杀案，他返回了家乡瓦胡岛。夏威夷州长认为Steve是个难得的人才，执意挽留他在岛上工作。她想让Steve组建一支专门负责调查重案的精英团队－－规矩由他来定，她在幕后提供支援。这支命名为「Five-0」（50）的团队不走过场，不玩花样，只要能抓住岛上最大的匪帮首领，他们就算是把天弄塌了也没事。