精品早期股骨头坏死部位还没有完全失去 课件.ppt

CS 546 - OOSD Object-Oriented Software Development Dr. Mao Zheng Department of Computer Science University of Wisconsin-La Crosse Major Topics Introduction to object-orientation Procedural Vs OO OO life cycle Definitions and Concepts Objects and Classes Relationships among classes Association, Aggregation, Generalization Distinguishing Features of OO Encapsulation, Polymorphism Parameterization and abstraction Transforming functional requirements to OO design Major Topics (Contd…) OOA/OOD notations UML UML in detail Various views and notations in each view Examples Object-Oriented Programming Language Features Comparison of OO languages Java, C++, Smalltalk, Eiffel, Visual Basic(?), C# Major Topics (Contd...) Advanced topics, if time permits Object Constraint Language (OCL) Object-Oriented Program Testing Object-Oriented Software Metrics Object-Oriented Databases CORBA (Common Object Request Broker Architecture) COM/DCOM Procedural Approach Vs Object-Oriented Approach Procedural Approach emphasis on functions/tasks to be performed global and local data modular decomposition and composition execution thread defined in terms of sequences of procedure or function calls Procedural Approach - Example A grocery store sells a collection of items. Information about the items and prices are kept in a database. A customer purchases a set of items; a bill is produced for the items purchased; the bill also includes taxes (shown separately). For simplicity, it is assumed that the customer pays cash only. The system must display change, if any, after the customer pays. It also needs to update the stock after each purchase. Procedural Approach – Example (continued) Tasks to be implemented: Add an item information to the database Retrieve an item information while purchasing Update the stock of the item being purchased Compute the subtotal and tax, and also the total for a purchase. Compute the change, if any, after a purchase. Object-Oriented Approach emphasis on objects i