10.6. Object Diagrams
When describing how objects can interact, we sometimes find it helpful to sketch out a scenario of specific objects and their linkages, and for that we create an object diagram. An instance, or object, looks much the same as a class in UML notation, the main differences being that the following:
We typically provide both the name of the object and its type, separated by a colon. We underline the text to emphasize that this is an object, not a class (see Figure 10-27).
Figure 10.27. Representing an object
The object's name can be omitted if we want to refer to a "generic" object of a given type; such an object is known as ...