By Mark Priestley
This article appears on the layout of computing courses utilizing the innovations of object-oriented layout and UML. It covers modelling recommendations and notation intimately, supported by means of workouts all through. it really is appropriate for either Java and C++ clients.
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Additional info for Practical Object-Oriented Design with UML
2, showing the use cases which were identified in the informal statement of requirements. 2, simply show actors, use cases and the relationships between them. Actors are represented by a stylized icon of a person, and use cases by ovals containing the name of the use case. Where an actor participates in a particular use case, this relationship is shown by a line connecting the actor to the relevant use case. UML allows more structure to be included in a use case diagram by defining various types of relationship between use cases.
4 also shows an alternative way of labeling a link, Rather than giving the link itself a name, a label can be attached to either end of (he link: such labels are known as role names, A role name is in effect the name by which the object next to the role name is known to the object at the other end of the link. A useful convention, therefore, is to use the names of the fields used to implement links as role names, as in this case. The name of the field in the part class that holds the reference to the catalogue entry is used as the role name at the catalogue entry end of the link.
6. 1. The use case describes the general case of creating a graphical element, not just the specific case of the rectangle considered above. It is clear from the specification of the editor that identical interactions are involved in the creation of all graphical elements, and therefore one use case will serve to describe all of them. 1 Use case for creating a graphical dement Name Create graphical element Description If necessary, the user makes the appropriate creation tool active. The user moves the cursor to the desired start point of the shape and presses the mouse button.