总之，该部分讨论了UML和类图、继承、多态性、封装…一些应该在开头为您介绍的东西。
Anyway, this section talks about UML and class diagrams, inheritance, polymorphism, encapsulation... things they should have shown you in the beginning.
识别一个uml类图的继承树。
图5展示了产生一个继承树类图的过程。
Figure 5 demonstrates the process of generating an inheritance tree class diagram.
应用推荐