The object diagram
An object diagram is made up of real-life instances of class diagrams or parts of class diagrams. As such an object diagram can be seen to be an example of a class diagram. Object diagrams may be drawn to explain class diagrams or to capture certain real life scenarios as examples to demonstrate concepts and/or certain states of the class diagram at a point of time.
Example:
graphic
From class diagram:
graphic
Top
Google
 
Web xpdian.com