07A_Object-Oriented_Design_I.pdf

07A_Object-Oriented_Design_I.pdf - 7A Object-Oriented...

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COMP 1210 – Fundamentals of Computing I Slide 7A - 1 7A. Object-Oriented Design I Objectives - when we have completed this set of lecture notes, you should be familiar with: § Software development activities § determining the classes and objects that are needed for a program § the relationships that can exist among classes § the static modifier
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COMP 1210 – Fundamentals of Computing I Slide 7A - 2 Program Development The creation of software involves five basic activities plus maintenance: § Establishing system hardware/software requirements, boundaries, interfaces, etc. (esp. for embedded systems) § Establishing/analyzing the software requirements § creating a software design § Constructing the code (a.k.a. Implementation) § testing the implementation § Maintaining the software after delivery
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COMP 1210 – Fundamentals of Computing I Slide 7A - 3 Program Development The activities below can be linear, can overlap/interact, or can be naturally cyclical System Engineering Requirements Analysis Design Construction Testing Maintenance Many variants of the process model Our focus in COMP 1210 Let’s discuss these four
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COMP 1210 – Fundamentals of Computing I Slide 7A - 4 Requirements Software requirements specify the tasks that a program must accomplish § what to do (not how to do it) Translating what the customer wants into what the software should accomplish. Sample customer requirement: “I need software that will provide interoperability between disparate C4ISR systems.” (concept of Command, Control, Communications, Computers, Intelligence, Surveillance and Reconnaissance) § It’s not time to start coding yet.
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COMP 1210 – Fundamentals of Computing I Slide 7A - 5 Requirements A simple requirement: “I want something to check products against their barcodes.” A partial requirements document: The user must be allowed to specify each product by its primary characteristics, including its name and product number. If the bar code does not match the product, then an error should be generated to the message window and entered into the error log. The summary report of all transactions must be structured as specified in section 7.A.
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COMP 1210 – Fundamentals of Computing I Slide 7A - 6 Design S oftware design : how a program will accomplish its requirements.
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