Some Design Guidelines in Java

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For the design phase, when the details become more critical, the UML allows complete specification of classes The detail can be so complete, in fact, that some UML tools can generate code from the UML diagrams (and the other way around, too) So at the end of the design phase, the shape class diagrams can show a fine level of detail:
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One of the current hot topics in object-oriented software development is just where to draw the lines between analysis, design, and implementation In fact, there really is a different answer depending on the overall size of the project The various development methodologies can be divided into two camps, more or less For small to medium projects, those with 20 or less programmers and time frames of a year or so, there are several lightweight or agile methodologies For larger projects with longer time frames, there are several heavyweight methodologies 9 presents overviews of
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some of these methodologies Which methodology to use is often a matter of the group or corporate personality Even though there are several specific methodologies to choose from depending on the size and characteristics of the software being developed, there are still some fundamental design principles that apply to any methodology, and the next section will cover some of these design basics
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Some Design Guidelines
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Good design doesn't come easily It usually requires considerable experience to be able to develop a good design And it a certainty that two great designers are likely to come up with two equally good, but different designs for the same problem And no two designers would come up with the same list of the most important design principles, although there would certainly be significant overlap This section presents some basic design principles Most of these principles apply to the design phase, but many also apply to the analysis phase Good design is good design, no matter the phase of development Probably the only way to get good at design is to design many programs, preferably with someone more experienced who can help you learn It is not easy, and even the best and most experienced designers don't get their design completely right the first time The following guidelines may not be complete, and certainly aren't the same ones someone else would pick, but they provide a good starting point Get The Big Picture Before you can create a good design, it is important to have a good
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understanding of what the software needs to do, and what computing resources it will require to implement Much of this understanding comes from the early planning phase
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Understand the Problem
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One of the most important tasks is to understand the problem This will often mean frequent talks with the customer The customer needs to supply the experts necessary for the designers and programmers to understand the problem domain A good analysis of the problem helps to improve understanding
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Understand the Target Environment
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While the customer will be best at providing the information necessary to understand the problem domain, it is the programmers who will best understand the target computing environment It is important to understand the limitations and features of the target computing environment Sometimes, a software project will even require designing and specifying the hardware involved The specific programming language used influences the ultimate design
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Think Objects
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To get a good object-oriented design, it is critical that the developers think objects If there are members of the development team that come from non-object oriented environments, they must learn to think objects
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Get Help
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Even the best designers can't design great systems without help The kind of help you need depends It can include expert help to understand the problem domain, or help to understand specific hardware or software required for the project
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