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CHAPTER
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Software Design
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In this chapter you will learn: what classes and objects are and how to describe classes of object; different types of object interactions; how different classes of object can be related to each other; how to depict these relationships and interactions in simple diagrams; suitable structures for Visual Basic applications
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Designing Objects, Classes and Applications
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In the previous chapter, we described how the process of software development was conducted, and looked at ways in which the requirements of a software system could be stated, decomposed and expressed in a form that made them suitable for rendering in a programming language We did not consider the actual detailed process of programming or program design In this section, we will start from the premise that we have fully speci ed a system and need to develop an object-oriented design that describes how to implement it Only the most trivial of computer systems are based on a single type of object or algorithm many of the early programs you write will implement one type of object, but this is purely for the convenience of learning what objects are and how they work In real software solutions, we need to be able to describe how objects will interact, sometimes in very complex situations We will learn how to develop an object-oriented system, including inter-object interactions, to the point where it can be coded in a programming language Previously, we looked at algorithms as a form of description that was entirely separate from the way that a computer program would be required to implement it The key feature in proposing an algorithm was that it should not be encumbered with details of how a speci c programming language would be used to implement it At some point, we need to reconcile the abstract algorithm with the concrete requirements of a computer programming language We can picture the development phases of the life-cycle as a progression, from very abstract speci cations, through the design stages to a concrete implementation, as shown in Figure 21
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21 Designing objects, classes and applications
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Progression through the life-cycle development phases
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For our purposes, we can consider these steps in the progression to be as follows:
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software speci cation is the identi cation of the objects required by the system to do its job and the services these objects must provide; software design is the development of a plan for how the various objects will cooperate on the overall job being done; software implementation is the act of realizing a software design as classes in an object-oriented programming language
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In the previous chapter we saw how a software requirements description could be analysed so that we could identify the objects required by the system We can now go on to learn how the objects might be developed to a stage where we could implement them in our chosen language
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211 Class and Object
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Our rst requirement is to be able to describe an object, in terms of what information it contains, and what operations it can perform Visual Basic comes complete with an entire library of pre-de ned types of object Many of these are controls, another name for user-interface components, but there are also classes for managing data at run time, dealing with les, 2-D and 3-D graphics, providing services for database access and Internet communications, managing the execution of programs and simplifying the use of the system printer and other resources All of them share the key characteristics of any software object:
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they are de ned as members of a class, which is simply another way of saying that there are different types of object; they are encapsulated that is, the internal representation of information and operations are protected from users of the objects behind a public interface; their capabilities are de ned in two ways properties, which are the attributes, or recognizable features of an object, and methods, which are the operations a particular class of object can perform
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The notion of a class is one with which you are probably familiar One very speci c use of the word class is to identify a group of students at the same approximate level of learning However, a more general explanation of the term is that it describes a collection or division of people or things sharing a common
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