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3. Use object instead of string to record the current state, which makes the state switching more clear at a glance.Graphic: GeForce GTX 670/GeForce GTX 1050/AMD Radeon HD 7870Users can safely request proxies. They only care about whether they can get the desired results. If we don't need a proxy object, we can directly change it into an ontology object to call the method.外星机器入侵地球，掠夺地球自然资源，无情的屠杀居民，人类数量急剧减少，在一个偏远的乡村，饥饿的人们已经变得和外星机器一样危险，一个19岁的女孩莎拉·康诺利，绝望的与一群试图摧毁她父母农场的土匪对抗……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.雁荡山还留下多少军队？尹旭没好气地看了两人一眼，沉声问道。其实最为紧张的要算是徐建，关于周家的这些信息是之前的事情，现如今是否还是如此可真是不一定。