The static methods in the Factory class will then call the instance methods of your factory instance.
然后，Factory类中的静态方法会调用您工厂实例的实例方法。
Static methods can only access instance methods or instance data after an instance of the class is created. That is, after an object has been created.
静态方法只能在实际对象被创建后使用实际变量和实际方法。
Static methods can only access instance methods or instance data after an instance of the class is created. That is, after an object has been created.
静态方法只能在实际对象被创建后使用实际变量和实际方法。
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