Attributes in domain modeling class diagrams

In domain modeling class diagrams, an attribute represents a data definition for an instance of a classifier. An attribute describes a range of values for that data definition.

A classifier can have any number of attributes or none at all. Attributes describe the structure and value of an instance of a class.

For example, a Client class might have a balance attribute that holds the amount of money in the client's account.

In domain modeling class diagrams, Java fields map to attributes.

Attributes are shown in the attribute compartment of a classifier in a class diagram. Attributes that are defined in the scope of the class, that is static, are shown as underlined. The visibility styles of attributes can be represented as text symbols (such as "-") or icons (such as The image shows an attribute visibility style icon.).

The following figure illustrates how attributes are represented with visibility icons in UML class diagrams.

Java source code UML visual representation
The image shows the sample Java source code. The image shows how attributes (fields) of a Java class are represented in UML class diagrams.

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