安徽工业大学 软件工程 方木云 ch.ppt

领书单　　　　 　　　　　进书通知 进书通知　 　购书单　　　　　　　　　　　　　缺书单 DFD练习—售书系统 1 销售 2 采购 书库 保管员 　学 　生 F1教材存量表 F2缺书登记表 The Unified Modeling Language统一建模语言 Devised by the developers of widely used object-oriented analysis and design methods Has become an effective standard for object-oriented modelling Notation Object classes are rectangles with the name at the top, attributes in the middle section and operations in the bottom section Relationships between object classes (known as associations) are shown as lines linking objects Inheritance is referred to as generalisation and is shown ‘upwards’ rather than ‘downwards’ in a hierarchy Object aggregation Aggregation model shows how classes which are collections are composed of other classes Similar to the part-of relationship in semantic data models Object aggregation Object behaviour modelling A behavioural model shows the interactions between objects to produce some particular system behaviour that is specified as a use-case Sequence diagrams (or collaboration diagrams) in the UML are used to model interaction between objects Issue of electronic items CASE workbenches A coherent set of tools that is designed to support related software process activities such as analysis, design or testing Analysis and design workbenches support system modelling during both requirements engineering and system design These workbenches may support a specific design method or may provide support for a creating several different types of system model An analysis and design workbench Analysis workbench components Diagram editors Model analysis and checking tools Repository and associated query language Data dictionary Report definition and generation tools Forms definition tools Import/export translators Code generation tools Key points(主要知识点) A model is an abstract system view. Complementary types of model provide different system information Context models show the position of a system in its environment with other systems and processes Data