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As the name implies, iterator pattern is to access objects in an aggregation sequentially. Generally speaking, it is very common in collections. If you are familiar with collection classes, it will be very easy to understand this pattern. This sentence contains two meanings: one is the object that needs to be traversed, that is, the aggregated object, and the other is the iterator object, which is used to traverse the aggregated object. Let's look at the diagram:加上后面邓陵墨和杜殇手下拼死断后，因而很快赶到军营边缘。Method 1: Delete the rule according to the rule numberIn addition to solving the port problem of A, the serial number problem also needs to be paid attention to. The serial number corresponds to the sliding window. The fake TCP packet needs to be filled with the serial number. If the value of the serial number is not in the sliding window of B when it is sent to B before A, B will actively discard it. So we need to find the serial number that can fall into the sliding window between AB at that time. This can be solved violently, because the length of a sequence is 32 bits, and the value range is 0-4294967296. If the window size is like 65535 under Windows I caught in the above figure, I only need to divide, and I know that at most I only need to send 65537 (4294967296/65535=65537) packets to have a sequence number fall into the sliding window. The desired value can be calculated quickly by exhaustion on multiple control hosts.直到这一天，小美遇见了她的新同学小杰（林晖闵饰），她被小杰深深吸引……《米兰达》是一部在英国的BBC TWO台播出的情景喜剧，源于一档电台节目“Miranda Hart的玩笑商店”。