In modeling an association, there are times when you need to include
another class because it includes valuable information about the
relationship.
For this you would use an association class
that you tie to the primary association.
An association class is
represented like a normal class. The difference is that the association
line between the primary classes intersects a dotted line connected to
the association class.
Rename both Classes to Student and
Course, add attributes & methods in the Student Class, and add a
constraint on the age.
Create an association class using the
top down menu.
Add a link from the association class to
the selected association link (e.g.metamodel
association).
The association class ends will be
automatically created once the association class link is connected to
the
association.
2. Metamodel Association
Class
Let use the XMI Editor to create all class diagram elements and
not generate any java code.
Figure below shows an association class for the
airline industry example.
Create a new Class in the metamodel by selecting the
package > New Child > Package Element
> Class
Rename the created class to Flight using
the property view Name Field.
Create a new association class by
selecting the package > New Child
> Packaged Element > Association Class.
Drag and drop the metamodel classes from
the XMI editor to the Class Diagram (e.g.
No Java code will be created).
.
Add a property to your metamodel Class
using the Class contextual menu > New > Property.
(Note that you can add the name of
the property with no syntax control using the Property View).
Here is the created diagram and the
metamodel view of the created class diagram.
