The object diagram shows instances created and the links between them at any given time. Therefore the object diagram is used once the system is active. Unlike the class diagram, giving a static representation of the system, object diagram is dynamic, depends on when you look at the system, and varies depending on the operations performed by the user.
Instances are represented within a rectangle with its name underlined and sometimes the value of one or more of its attributes.
The name of an instance is presented as follows:
instanceName: ClassName
The attribute value is presented as follows:
attributeName = valorAtributo
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