Structural concepts, such as class and interface, are fundamental to both Java and the UML. This section identifies how these concepts map to Java and the UML.
In the UML, a Java class is represented via a compartmentalized rectangle. Three horizontal compartments are used:
Name compartment: Shows the Java class name
Attribute compartment: Lists variables defined on the class, if any
Operations compartment: Shows methods defined on the class, if any
Figure 4-1 shows a simple Java class without any variables and methods.
Figure 4-1. A class in Java and the UML
An abstract class is identified by italicizing the class name. ...