南京大学：《面向对象技术 OOT》课程教学资源（PPT课件讲稿）13 设计模式 Design Patterns（3）

&雪扇 Example 102 UNIVE 16 D The "check"at a diner Cook Customer Order Waitress (Receiver) (Client) (Command) (Invoker) Ordero PlaceOrderO CookO Order Thank You! Institute of Computer Software 2022-2-27 Nanjing University

Example  The " check" at a diner 2022-2-27 Institute of Computer Software Nanjing University 16

&雪扇 Example 102 UNIVE invoker 17 configuration Appllcation Menu Menultem Command command Add(Document) Add(Menultem) Clicked( Execute( Document command->Execute() Open( Close() Cut( Copy() Paste() client command Institute of Computer Software 2022-2-27 Nanjing University

Example 2022-2-27 Institute of Computer Software Nanjing University 17 client invoker command configuration

&雪扇 Example 102 UNIVE 18 Command Execute() Document Open() Close() Cut() document PasteCommand Copy( Paste() Execute() document->Paste() receiver Institute of Computer Software 2022-2-27 Nanjing University

Example 2022-2-27 Institute of Computer Software Nanjing University 18 receiver

条 Example 102 UNIVE 19 Command Execute() Application Add(Document) OpenCommand application Execute() AskUser() receiver name AskUser() doc new Document(name) application->Add(doc) doc->Open() Institute of Computer Software 2022-2-27 Nanjing University

Example 2022-2-27 Institute of Computer Software Nanjing University 19 receiver

条 Example 1002 UNIVE 20 Command Execute() commands MacroCommand Execute() for all c in commands 系列的命令 c->Execute() Institute of Computer Software 2022-2-27 Nanjing University

Example 2022-2-27 Institute of Computer Software Nanjing University 20 一系列的命令