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  Tutorial: Visual Case Tool - UML Tutorial

Visual Case Tool - UML Tutorial

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3. The Class Diagram
The class diagram is core to object-oriented design. It describes the types of objects in the system and the static relationships between them.

Packages
Packages allow you to break up a large number of objects into related groupings. In many object oriented languages (such as Java), packages are used to provide scope and division to classes and interfaces. In the UML, packages serve a similar, but broader purpose.

Any UML diagram in Visual Case can have packages on them. Each package can contain any type and any number of other UML diagrams, as well as interfaces and classes.

Classes
The core element of the class diagram is the class. In an object oriented system, classes are used to represent entities within the system; entities that often relate to real world objects.

Attributes

An attribute is a property of a class. In the example above, we are told that a Contact has an address, a city, a province, a country and a postal code. It is generally understood that when implementing the class, functionality is provided to set and retrieve the information stored in attributes. Methods to set and retrieve attribute data are often called accessor methods (also getting and setting methods) and need not be shown in your model as they are usually inferred.






 

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