In this chapter
Instances and objects
Modeling concrete instances
Modeling prototypical instances
The real and conceptual world of instances
The terms “instance” and “object” are largely synonymous, so, for the most part, they may be used interchangeably. An instance is a concrete manifestation of an abstraction to which a set of operations may be applied and which may have a state that stores the effects of the operation.
You use instances to model concrete things that live in the real world. Almost every building block in the UML participates in this class/object dichotomy. For example, you can have use ...