NAN - 面向对象设计的相关问题 1902 17 How to find the object types? How to describe the object types? How to describe the relations and commonalities between object types? How to use object types to structure programs? Institute of Computer Software 2022-2-27 Nanjing University面向对象设计的相关问题  How to find the object types?  How to describe the object types?  How to describe the relations and commonalities between object types?  How to use object types to structure programs? 2022-2-27 Institute of Computer Software Nanjing University 17