&雪扇 摘要 UNIVE 2 Design Patterns ▣Why,What,How Creational,Structural and Behavioral Patterns Institute of Computer Software 2022-2-27 Nanjing University摘要  Design Patterns  Why, What, How  Creational, Structural and Behavioral Patterns 2022-2-27 Institute of Computer Software Nanjing University 2