Software Design Center

HOW TO DRAW BOOCH DIAGRAMS (cont'd)

More Booch's Class and Object Diagram Notations

Class Visibility
Visibility markers signify who can access the information contained within a class. Public visibility allows an attribute or an operation to be viewed by any other class. Private visibility means that the attribute or the operation is only accessible by the class itself and its friends. Protected visibility makes an attribute or operation visible only to friend classes and classes that inherit it. Implementation restricts the accessibility of an attribute to the class only (not even friends have access to these attributes).

Place visibility markers next to the attribute they refer to.

Object Visibility
Draw a visibility marker on a link to signify the relationship between the connected objects. These markers can be:
G - Global
P - Parameter
F - Field
L - Local

Relationships
Indicate relationships between objects using lines and arrows. Learn how to connect two objects.