TAILIEUCHUNG - Software Engineering - Lecture 7: Object Oriented Design

Software Engineering - Lecture 7: Object Oriented Design trình bày về gán trách nhiệm cho các đối tượng, Design Principles, Business Policies, Class Diagram. Bài giảng phục vụ cho các bạn chuyên ngành Công nghệ thông tin. | LECTURE 7: Object Oriented Design Ivan Marsic Rutgers University Topics • Gán trách nhiệm cho các đối tượng • Design Principles • Expert Doer • High Cohesion • Low Coupling • Business Policies • Class Diagram 2 System Sequence Diagrams Biểu đồ tuần tự hệ thống cho usecase mở khóa : System User Timer «initiating actor» select function(“unlock") «offstage actor» prompt for the key enter key verify key signal: valid key, lock open open the lock, turn on the light start ("duration“) System Sequence Diagrams considered interactions between the actors 3 Design: Object Interactions Design Sequence Diagram System Sequence Diagram Controller «initiating actor» select function(“unlock") : KeyStorage : LockCtrl checkKey() ystem : System User : Checker Timer sk := getNext() «offstage actor» prompt for the key alt enter key val != null setOpen(true) verify key signal: valid key, lock open open the lock, turn on the light [else] val == null : setLit(true) start ("duration“) • System Sequence Diagram mô tả tương tác giữa các actor • Object Sequence Diagram mô tả tương tác giữa các đối tượng 4 Metaphor for Software Design: “Connecting the Dots” Resident :InterfacePage :SearchRequest :Controller :PageMaker :DatabaseConn :Archiver :Notifier :InvestigRequest Ta bắt đầu từ các đối tượng/khái niệm từ pha phân tích, và sửa hoặc thêm các đối tượng mới, nhằm làm cho hệ thống hoạt động .

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