12.2 Base Classes and derived asses °继承的层次关系(大学社区成员关系图示例) Com munityMem ber Employee Student Alumnus Single inheritance Single Faculty Staff inheritance Administrator Teacher inheritance Administrator Tea cher Multiple inheritance 继承机制作用:软件复用;对事物进行分类; 支持软件的增量开发;对概念进行组合。 0 2018, SEU. All rights reserved. 9© 2009, SEU. All rights reserved. © 2018, SEU. All rights reserved. 9 12.2 Base Classes and Derived Classes 继承的层次关系（大学社区成员关系图示例） 继承机制作用: 软件复用；对事物进行分类； 支持软件的增量开发；对概念进行组合