Introduction to Object Oriented Design
- 1. Object Oriented Analysis and Design Lecture 1 INTRODUCTION Inam Ul Haq, [email protected] University of Education Okara Book: Applying UML and Patterns Thanks-Craig Larman
- 2. The Book Subject: OOA/D, University of Education Okara 2
- 3. Applying UML UML is a standard diagramming language. It is just a tool, not a skill that is valuable in itself. Knowing UML helps you communicate with others in creating software, but the real work in this course is learning Object-Oriented Analysis and Design, not how to draw diagrams. Subject: OOA/D, University of Education Okara 3
- 4. Assigning Responsibilities The most important skill in OOA / D is assigning responsibilities to objects. That determines how objects interact and what classes should perform what operations. Subject: OOA/D, University of Education Okara 4
- 5. Requirements Analysis All Software Analysis and Design is preceded by the analysis of requirements. One of the basic principles of good design is to defer decisions as long as possible. The more you know before you make a design decision, the more likely it will be that the decision is a good one. TFCL: Think First, Code Later! Subject: OOA/D, University of Education Okara 5
- 6. Use Cases Writing Use Cases is not a specifically Object Oriented practice. But it is a best practice for elaborating and understanding requirements. So we will study Use Cases. Subject: OOA/D, University of Education Okara 6
- 7. The Unified Process (UP) Definition: A standardized approach to analysis and design helps to ensure that all necessary tasks are understood and completed in software development. • A language that uses UP is called UML. The Unified Modeling Language (UML) is a language for specifying, visualizing, constructing, and documenting the artifacts of software systems, as well as for business modeling and other non-software systems. Subject: OOA/D, University of Education Okara 7
- 8. Other Necessary Skills Requirements Analysis, Object-Oriented Analysis and Object-Oriented Design are not a complete toolkit for a software developer. There are many other skills necessary in Software development, including programming. This course only covers a subset of the necessary skills. Subject: OOA/D, University of Education Okara 8
- 9. What is Object Oriented Analysis? The emphasis is on finding and describing the objects (or concepts) in the problem domain. E.g. In a Library Information System, some of the concepts include Book, Library, and Patron. Subject: OOA/D, University of Education Okara 9
- 10. What is Object Oriented Design? The emphasis is defining software objects and how they collaborate to fulfill the requirements. In a Library Information System, a Book object may have a title attribute and a get Chapter method. Subject: OOA/D, University of Education Okara 10
- 11. Implementation During Implementation, or Object-Oriented Programming, design objects are implemented, such as a book object in Java. Implementation is also known as Coding or Construction. Subject: OOA/D, University of Education Okara 11
- 12. Example Tasks Define Use Cases Define a Domain Model Define Design Class Diagrams Define Interaction Diagrams The End Subject: OOA/D, University of Education Okara 12