An object diagram is shown in this UML Object Diagram for Relationships. It represents the Order management system we discussed in the Class Diagram chapter. The diagram below depicts a specific instance of the system at the time of purchase. It contains the following items. The customer may increase the orders in the future, and the object diagram will reflect this. Looking at order, special order, and normal order objects, you will notice that they all have values. Object diagrams can be considered a snapshot of a running system at a specific point in time. In this case, we can imagine the snap of the running train as an object with the values listed above.
