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Javascript 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.Static Factory Method Mode/knneel (kneel down)Through this practical activity in the countryside, we not only deepened our knowledge in practice, but also learned knowledge not found in books and received profound education. I have learned about some people's feelings and the current situation of young people in the village and town. Through our observation and feelings and our conversation with the masses, we also feel the pragmatic working attitude of rural grassroots party members and cadres and their selfless dedication to work wholeheartedly for the interests of the people. It gives us a higher spiritual pursuit. In addition, in this practice, according to what I personally felt, saw and heard, I had the necessary understanding of the current situation in the town, thus entering into more in-depth thinking.There are many kinds of injuries in WOW, such as ice, fire, shadow and nature. . . Among them, the natural damage small D and SM have, small D's anger. Lightning of SM. .潍水河边，一场惨烈的屠杀正在上演，西楚国士兵一个接着一个倒在汉军的屠刀之下，惨烈，无比的惨烈。在岛上长大的少年憧憬着和马一起奔跑——