how to generate barcode in vb.net 2008 ExERCISE 9-1 Creating a Basic UMl Diagram with a UMl Tool in Java

Encoder Code39 in Java ExERCISE 9-1 Creating a Basic UMl Diagram with a UMl Tool

ExERCISE 9-1 Creating a Basic UMl Diagram with a UMl Tool
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This exercise will have you creating a UML diagram with a UML modeling tool. At a minimum, UML modeling tools allow for the quick creation of professional-quality diagrams. We have chosen the evaluation version of Enterprise Architect (EA) for
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Representing Object-Oriented Concepts with UML
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you to use to build a basic UML Class relationship diagram. For the exercise, you may choose a different modeling tool instead of EA just do a web search on a string similar to UML modeling tools. This exercise does include the initial installation steps of Enterprise Architect. 1. Using a web browser, go to the Sparx Systems main web site since they are the commercial vendor for Enterprise Architect: www.sparxsystems.com/. 2. Provided that the web site s main page has not changed, click the Test drive the 30-day trial link. 3. Find the download button, click it, and follow all the necessary instructions to a complete installation. Make sure you create a desktop shortcut to the EA application. 4. Double-click the Enterprise Architect icon on your desktop. The application will launch. 5. Click the menu buttons File | New Project. 6. In the File Name: edit box, type in the name of the exercise project: SCJA EA Exercise.eap. 7. When the Select model(s) dialog box opens, select Common from the Select From: combo box and choose the Class checkbox. Click OK. 8. Click the menu buttons Project | Add Package. The Create New View dialog box will be displayed. In the Name edit box, type the name of the diagram, Class Diagram Exercise. Select the Class View radio button. Click OK. 9. In the Project Browser pane, click Class Diagram Exercise. 10. Click the menu buttons Project | Add Diagram. The New Diagram dialog box will open. Select UML Structural and Class from the list boxes. Click OK. Congratulations, you are now ready to create your first UML diagram with a CASE tool. 11. Drag the Class icon from the toolbox into the diagram area. The Class1 dialog box will be displayed. Click OK. 12. Drag another Class icon from the toolbox into the diagram area and release the mouse. The Class2 dialog box will be displayed. Click OK.
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Recognizing Representations of UML Associations
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13. Single-click the generalization association element. Click Class2 in the diagram, hold the mouse button and drag up to Class1, and then release. The generalization element will connect the two class diagrams. The end result should look like the image in the following Illustration:
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CERTIFICATION OBJECTIVE
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Recognizing Representations of UMl Associations
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Exam Objective 2.2 Recognize the UML representation of class associations, compositions, association multiplicity indicators, and association navigation indicators.
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Representing Object-Oriented Concepts with UML
The previous section solidified your knowledge of basic class diagrams and their main components. This next objective focuses on the relationships between classes in regards to their associations and compositions. Multiplicity indicators and role names are detailed as well to assist in specifying the relationships between classes. When you have completed this chapter, you will know how to recognize connectors used between classes and how to interpret any specified multiplicity indicators and role names. The following topics will be covered:
n Graphic paths n Relationship specifiers
Graphic Paths
The structure diagram graphic paths, also defined as class relationships, that are included on the SCJA exam include notations for aggregation, association, composition, and dependency, as depicted in Figure 9-7. Generalization and realization graphic paths are also on the exam, but these were covered in the previous objective.
FIGURE 9-7
com.scjabook.sample_package ClassA ClassC ClassE ClassG ClassI
Graphic path notations
ClassB
ClassD
ClassF
ClassH
ClassJ
Aggregation
Association
Association (Directed)
Composition
Dependency
Recognizing Representations of UML Associations
Aggregation Association Aggregation association depicts one class as the owner of one or more classes. Aggregation is depicted with a solid line and an unfilled diamond. The diamond is on the side of the classifier. In Figure 9-7, you could say that a ClassA object is part of a ClassB object. Association An association that is not marked by navigability arrows is implied to be navigable in both directions; therefore, each association end is owned by the opposite classifier. Association is depicted with a solid line. In Figure 9-7, you could say there is an association between ClassC and ClassD objects. Directed Association An association has (directed) navigation when it is marked with a navigability arrow, also described as a stick arrow. This directed association s arrow denotes navigation in the direction of that end, the classifier has ownership of the marked association end, and the unmarked association s end is owned by the association. In addition to the navigability arrow, directed association is depicted with a solid line. In Figure 9-7, you could say that a ClassE object has a ClassF object. Composition Composition association depicts a class being composed of one or more classes. The component parts/classes only live as long as the composite class. Composition is depicted with a solid line and a filled diamond. The diamond is on the side of the classifier. In Figure 9-7, you could say that a ClassH object is composed of one or more ClassG objects. Dependency Dependency association depicts one class having a temporary association with another class. Dependency associations occur when a class needs another class to exist or when an object is used as a return value, local variable, or method argument. Dependency is depicted with a dotted line and a stick arrow. In Figure 9-7, you could say that a ClassJ object depends on a ClassI object. As you probably noticed upon reading through the explanations of the relationships, class relationships can be written out using catchphrases between the objects. Common relationship catchphrases include has-a , is-a , is composed of , is part of , and uses-a . Notes Notes are represented in UML as a rectangle with an upper-right folded corner. Comments are placed into the notes element and a dotted line is drawn from the notes element to the artifact being commented on.
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