Very often, we use to manage the factory model generating examples. However, in...

代码说明：

很多时候，我们使用工厂模式来管理生成的实例。但在本示例中，我们使用类名来自动生成运行时实例--工厂自动化的机制-Very often, we use to manage the factory model generating examples. However, in this example, we used the class to automatically generate runtime example-- factory automation mechanism