Managing relationships of classifiers in domain modeling class diagrams

You can change Java field and association collection types to show attributes as associations or show associations as attributes. By default, Java attributes are shown as associations in domain modeling class diagrams. For example, if an attribute type is a collection, it is shown as an association to the collection type (vector) in a class diagram. In most cases, this might not be useful. Therefore, it is useful to show the type that the collection contains.