Attributes

In Unified Modeling Language (UML) visualization 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.

Attributes are shown in the attribute compartment of a shape. 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

Image showing an attribute visibility style icon.).

Java source code UML visualization

The image shows the sample Java source code.

The image shows how attributes (fields) of a Java class are represented in UML class diagrams.

 

Parent topic

About UML class diagrams

 

Related concepts

Class diagrams
Class shapes
Classifiers
Classes
Relationships
Operations
Adornments for unresolved references
Multiplicity
Visibility

 

Related tasks

Changing the default for showing attribute and operation compartments
Changing the default visibility style for attributes and operations
Showing associations as attributes
Showing attributes as associations