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还说什么都不记得了，我呸。A men: team, individual all-round, floor exercise, pommel horse, rings, vault, parallel bars, horizontal bars, trampoline individual events;If the message has been matched by the previous rule, iptables performs the corresponding action on the message, Even the latter rules match the current message, It is very likely that there will be no chance to perform corresponding actions on the message again. Take the above figure as an example, the message is first matched by the first rule, so the current message is "released", because the message has already been released, so even if the second rule in the above figure can match the message just "released", there is no chance to discard the message just now. This is how iptables works.AladdinState mode and policy mode are like twins. They both encapsulate a series of algorithms or behaviors. Their class diagrams look almost identical, but their intentions are very different, so they are two very different modes. The policy pattern and the state pattern have in common that they both have a context, policies or state classes to which the context delegates the request to executeIf I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.小葱爱怜地替她捋捋耳边碎发，笑道：我哥这个人，什么事到了他嘴里，再难，也变容易了。