Design Patterns and Object Oriented Programming in Visual by Cooper J.W.

By Cooper J.W.

This consultant offers guide for utilizing layout styles in day-to- day programming. It bargains suggestion for VB6 programmers on migrating to VB.NET and utilizing its object-oriented positive aspects. each one bankruptcy describes a layout development and offers operating visible examples of its software. UML diagrams illustrate the family among a number of the chapter-projects. A better half CD-ROM comprises instance courses.

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A class is just a module as we have shown above, which has both public and private methods and which can contain data. However, classes are also unique in that there can be any number of instances of a class, each containing different data. We frequently refer to these instances as objects. We’ll see some examples of single and multiple instances below. Suppose as have a file of results from a swimming event stored in a text data file. 62 where the columns represent place, names, age, club and time.

Cooper 40 End Function Note that the temperature variable is declared as private , so it cannot be “seen” or accessed from outside the class. You can only put data into the class and get it back out using the four accessor methods. The main point to this code rearrangement is that the outer calling program does not have to know how the data are stored and how they are retrieved: that is only known inside the class. In this class we always store data in Celsius form and convert on the way in and out as needed.

This is an ideal time to think about program interfaces. The simple two method interface we specified above should work for any voltmeter, and the rest of the program should run without change. All you need to do is to write a class for the new voltmeter that implements the same interface. Then your Copyright © 2001, by James W. getVoltage End Sub Further, should your data needs expand so that there are still more meters, you can quickly write more classes that implement this same Voltmeter interface.

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