Beginning Object-Oriented Programming with VB 2005: From by Dan Clark

By Dan Clark

Beginning Object-Oriented Programming with VB 2005 is a accomplished source of right coding techniques. writer Daniel Clark takes you thru all of the phases of a programming undertaking, together with research, modeling, and improvement, all utilizing object-oriented programming strategies and visible simple .NET.

Clark explores the constitution of sessions and their hierarchies, in addition to inheritance and interfaces. He additionally introduces the .NET Framework and the visible Studio built-in improvement setting, or IDE. A real-world case research walks you thru the layout of an answer. you could then rework the layout right into a useful VB .NET application.

The program encompasses a graphical consumer interface (GUI), a company good judgment type library, and integration with a back-end database. during the ebook, you are going to discover the basics of software program layout, object-oriented programming, visible easy .NET 2.0, and the Unified Modeling Language (UML).

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Under the Class drop-down list, choose Integer, which will represent the loan number that will be returned to the Member object. Click OK to close the Return Parameter dialog box. Click OK to close the Operation dialog box. Figure 3-16. Return Parameter dialog box 6. Repeat steps 2 through 5 to add an Item class with a CheckAvailability method that receives an integer representing the item number and returns a Boolean indicating if the item is in stock. 7. In the main explorer window, expand the Item node and expand the CheckAvailability node.

Your completed diagram should be similar to the one shown in Figure 3-13. Save the file. CHAPTER 3 ■ DESIGNING OOP SOLUTIONS: MODELING THE OBJECT INTERACTION Figure 3-13. Completed sequence diagram Adding Methods to the Class Diagram After you have developed the sequence diagram, you begin to gain an understanding of the methods that must be included in the various classes of the application. You achieve the message interaction depicted in the sequence diagram by a method call from the initiating object (client) to the receiving object (server).

Once the item availability has been confirmed, a loan is created recording the item number, member number, checkout date, and return date. 1. By examining the noun phrases in the scenario, you can identify which objects will be involved in carrying out the processing. The objects identified should also have a corresponding class depicted in the class diagram that has been previously created. From the scenario depicted, identify five objects that will carry out the processing. 2. After the objects have been identified and cross-referenced with the class diagram, the next step is to identify the messaging that must occur between these objects to carry out the task.

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