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First, create a common interface between the two:Huang Weiping even went to mix with the underworld, but he did not find the loyalty of the Jianghu in the movie. "The underworld has also been reduced to only watching money." After some indulgence in eating, drinking, whoring and gambling, Huang Weiping completely destroyed his life.LittleFox英语启蒙之ABC入门篇。If a source address is repeatedly disguised, the address will be quickly detected and filtered out. In most cases, using many different source address camouflage will make defense more difficult. In this case, the best defense method is to block spoofed packets with similar source addresses as much as possible.Experimental process:Singleton is a common design pattern. In Java applications, a singleton object can ensure that only one instance of the object exists in a JVM. This model has several advantages: