最病 过摘要 2 口 Agile Design a design principles 口 Design Patterns a Why What, How a Creational structural and behavioral patterns Institute of Computer Software 2021/2/5 Nanjing University摘要 Agile Design design principles Design Patterns Why, What, How Creational, Structural and Behavioral Patterns 2021/2/5 Institute of Computer Software Nanjing University 2