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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.这可成了无头公案了。葫芦率人经过仔细勘察，断定高凡一行人是从山塘附近走的。When TCP transmits data, the data will first exist in the receiving buffer. The size of the buffer is indicated by the TCP window. If the window size is set to 0, it means that the buffer has been filled up. The sending end should stop sending data until the receiving end window is updated. Sockstress uses this principle to maintain the TCP connection for a long time to achieve the purpose of denial of service.Avoidance = Agility * 1* * Maybe wizards will also use it, after all, aconite daisy root and so on are not all * *尤其是进入秋季之后，洪水较多……再晚一些进入冬季之后就是苦水季节，水位太低，不利于行船………,这个不需要探查尹旭也是知道，从江陵西往巴蜀，大江水道正是文明后世的巴东三峡。