In other words, an application cannot completely defer to a message instance from the service interface definition alone.
也就是说，应用程序可以不完全单独遵从来自服务接口定义的消息实例。
Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.
定义一个用于创建对象的接口，让子类决定实例化哪一个类。工厂方法使一个类的实例化延迟到其子类。
Define an interface for creating an object, but let subclass decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.
定义一个用于创建对象的接口，让子类决定实例化哪一个类。工厂方法使一个类的实例化延迟到其子类。
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