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Sample text

Now consider the user interface classes. I didn’t bother to list the attributes because they are modeled well enough by the prototype and Associations are bidirectional only if they need to be traversed in both directions. Responsibilities are usually modeled as attributes or methods. 212 The Object Primer DEFINITIONS Bidirectional association. An association that may be traversed in both directions. Unidirectional association. An association that may be traversed in only one direction. Visibility.

My advice, however, is if your label is not clear, then you should consider rewording it. Refer to Figure 5-9 for an overview of modeling associations in UML class diagrams. At each end of the association, the role, the context an object takes within the association, may also be indicated. My style is to model the role only when the information adds value, for example, knowing the role of the “Student” class is “enrolled student” in the “enrolled in” association doesn’t add anything to the model.

Messages are indicated as labeled arrows, when the source and target of a message is an object or class the label is the signature of the method invoked in response to the message. However, if either the source or target is a human actor, then the message is labeled with brief text describing the information being communicated. ” Notice how I include both the method’s name and the name of the parameters, if any, passed into it. Figure 6-7 also indicates that the Student actor provides information to the “:SecurityLogon” object via the messages labeled “name” and “student number” (these really aren’t messages; they are actually user interactions).

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The Object Primer 2nd Edition - The Application Developer's Guide to Object Orientation and the UML

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