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ExclusionJavascript neither supports abstract classes nor has the concept of interfaces. Therefore, be very careful when using the state mode. If you forget to implement the buttonWasPressed method for a state subclass when writing a state subclass, an exception will be thrown when the state switches. Because Context always delegates requests to the buttonWasPressed method of the state object. Therefore, let the abstract method of the abstract parent class throw an exception directly, which will be found at least during the program run.SynFlood attack belongs to one of TCP attacks. SynFlood attack is the most common and harmful attack in Flood class, and it is also one of the oldest attacks. Before understanding SynFlood attack, you can look at the detailed explanation of TCP attack.他握紧拳头冷笑道：一个士卒而已，每天战场上不知要死多少，偏他就不能死了，只要死了就是被人谋害？真是天大的笑话。远远的，田遥听见东北角绿叶尽头传来清脆的说笑声。/victory