面向对象与UML Lect14-RESTAURANT_SYSTEM-Detailed_design-implementation.ppt

Lecture 14. Detailed Class Design and Implementation:  Restaurant Example 内容提要： Detailed class design (Mark Priestley 6.4, 6.5) Implementation Diagrams (Mark Priestley 7.1) Implementation Strategies (Mark Priestley 7.2) Implementation of Classes (Mark Priestley 7.5) Implementation of Associations (Mark Priestley 7.6) Implementation of Operations (Mark Priestley 7.7) 6.4 THE DESIGN MODEL THE DESIGN MODEL The complete design of the first iteration of the restaurant booking system has now been described as below by combining Figure 5.13 (application layer) Figure 6.4 (input/output, observer) Figure 6.8 (handle persistency storage) 6.5 DETAILED CLASS DESIGN 详细设计的主要任务：明确类的属性与方法 A major task of detailed design is to specify, in detail, the attributes and methods needed by each class. 对于关键性的软件，详细设计可能包括一些方法所使用的算法设计，例如有哪些信誉好的足球投注网站算法。 6.5 DETAILED CLASS DESIGN 回答：时序图中的消息即为类中的方法 The sequence diagrams can be used to decide almost all the methods: messages in the diagrams can be reformulated into methods. 6.5 DETAILED CLASS DESIGN The steps in designing methods Collect all the relevant messages from the sequence diagrams (收集所有的消息) Check them for consistency (检查一致性) and Add information about parameters and return types as necessary (增加参数信息，与返回类型) 可以使用表格显示所有的指向某个特定的对象的消息 We use a table to record all the sequence diagrams, each containing all the messages related to a certain object So, we collect all the candidate messages produced in the analysis phase and in the early phase in the design for a certain object 在决定方法时应该做的事情： 消除冗余。Check all the messages to get rid of the redundancy part 完整性。Check for methods consistency 适当改变。Properly modify the method 决定返回值。Decide return types and 决定参数。Decide parameter types 6.5 DETAILED CLASS DESIGN BookingSystem In this section, we will do detailed design for the BookingSystem class, which can be ser