Some features described here are available in Ultimate edition only.
You can populate your model with node elements
(classes, interfaces and enumerations),
and delete them from diagram, or from your project. When a node element is created in a UML Class
diagram, the corresponding stub file is created in the current package.
In a similar way, IntelliJ IDEA helps create members
(fields, methods, or constructors)
in the node elements.
It is also possible to clarify the contents of diagrams with notes, which are created same way.