黑人给我开包了蘑菇

Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.　　陆远做的一切就是为了赢回前妻，却意外遇到了外形出众，却并非善类的小丫头片子江菜——江浩坤的妹妹，阴差阳错，两人成了欢喜冤家，并共事于江浩坤饭店后厨。啼笑皆非中，陆远终于想明白自己接下来的路应该何去何从，要想真正的改头换面，在哪儿跌倒的还得在哪儿爬起来。但是蒯彻似乎是个奇才，遭遇也很是奇怪，他竟然失业了。Grandma Lily opened the book.一名充满争议的教派领袖在俄勒冈州的沙漠中建起乌托邦之城，他与当地居民的冲突演变为了全球新丑闻。In 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.