16. Object Diagrams
Sometimes, it can be useful to show the state of the system at a particular time. Like a snapshot of a running system, a UML object diagram shows the objects, relationships, and attribute values that obtain at a given instant.
A Snapshot in Time
Some time ago, I was involved with an application that allowed users to draw the floor plan of a building on a GUI. The program captured the rooms, doors, windows, and wall openings in the data structure, as shown in Figure 16-1. Although this diagram shows you what kinds of data structures are possible, it does not tell you exactly what objects and relationships are instantiated at ...
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