这是个关于类的示例，定义一个dog类，然后通过继承，派生出工作狗，宠物狗，商业狗等类，可以通过人机界面输入，修改信息。-This is a category for example, the definition of a dog category, and then through inheritance, derived from the work dogs, pet dogs, dogs and other types of business, human-machine interfac