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Conclusion
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The brake has a push behavior, as does the gas pedal What other polymorphisms can you nd in the car The car has many reusable components That was the revolution that resulted in the Model T and most automobile manufacturing and repair since then Think about the bene ts of reusable components 2 Look around you, and think about other real-world objects and how they follow object-oriented principles 3 Try visualizing one of your current applications in terms of objects and classes
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1 INTRODUCTION TO OO IN NET
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C H A P T E R
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DESIGNING SOFTWARE
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Therefore, we may reasonably conclude that no matter how sophisticated the design method, no matter how well-founded its theoretical basis, we cannot ignore the practical aspects of designing systems for the real world Grady Booch, Object-Oriented Design with Applications It is not enough to understand the theoretical aspects of object-oriented analysis and design You need to consider practical aspects of the software process as well A perfectly formed object model is useless if it takes so long to de ne that the business changes before you complete the model A fully-detailed design is worthless if it takes so long that, to meet the schedule, development starts concurrent with the design ( Sam, you go talk to the users; Jessica, you start the coding ) Then there are the steps that are often not considered to be part of object-oriented analysis (OOA) and object-oriented design (OOD), such as user interface design and database design These too need to be thought out, preferably before a signi cant amount of development is under way This chapter presents a pragmatic software design methodology to help you quickly and ef ciently analyze and design your applications for the real world This methodology provides easy-to-follow steps to help you and your project team collect requirements, perform the design (including user interface, database, and classes), de ne an architecture, and prepare for development To illustrate the design process, this chapter introduces a sample application that is then built throughout the remaining chapters
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The Purpose of Design
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Visual Studio and Visual Basic make it easy to develop an application without any real forethought You can just add forms to your project, doubleclick on the forms and add code, then keep modifying the code until it
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2
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Designing Software
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works, and modify it further until it actually performs the required tasks This may work if your application is very small (two or three forms) But this technique can become very impractical very quickly Without a design, you have no plan or strategy for the application s development Without a design, you are building the application based on guesses about what the users need When you deliver a guess-based application, you then need to modify it until it really does what the users need This can lead to extended development times and much frustration for you and your users Thinking through the design before you build ensures that you are building the right application It helps you understand what the application is supposed to do It assists you in communicating with the domain experts about the application requirements It helps you select the appropriate architecture and set of technologies for the application It identi es the data that the application needs and how to work with it And it sets you on a path that allows you to build more in less time The amount of time you spend on the application s design depends on the application s complexity You would spend a great deal of time and money designing a new home, for example, but not much time or money designing a tree house for the kids The same applies to your application You may not spend much time designing the application to track the team scores for your bowling league, but you will want to take the time to do a careful design of your company s order entry/inventory/invoicing application Remember, however, that small projects don t always stay that way Designing small projects with the same care as large ones can pay off with a foundation that supports future enhancements Otherwise, you could reach that dreaded quagmire called rewrite and nd that you need to start the whole process over! You may be thinking you really don t have time for design Management wants the application nished in weeks, not months But it is possible to work through the design process very quickly if you follow a good design methodology A design methodology helps you develop a plan for de ning the design Using a methodology, you can logically and ef ciently think through all aspects of the design A methodology is not a cookbook in which you follow speci c instructions and have a design when you are nished A methodology provides guidelines and a path As you proceed down that path, you use your experience and knowledge to create the design
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