最病 Collaboration 口当 Client提交一个请求时,请求沿链传递直至有 个 Concretehandler对象负责处理它 a client aConcreteHandler cHandler aConcreteHandler successor successor Sample Code Institute of Computer Software 2021/215 Nanjing UniversityCollaboration  当Client提交一个请求时，请求沿链传递直至有 一个ConcreteHandler对象负责处理它 2021/2/5 Institute of Computer Software Nanjing University 10 Sample Code