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This article mainly explains "what is the concept of UML object graph". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what is the concept of UML object graph"?

Brief introduction of UML object Graph

An object graph (ObjectDiagram) shows a set of objects and their relationships. Use object diagrams to illustrate data structures, static snapshots of instances of classes or components in class diagrams, and so on. The object diagram reflects the static process of the system like the class diagram, but it is expressed in terms of actual or prototyped scenarios.

The object graph shows the relationship between objects and objects at a certain time. An object diagram can be seen as a special use case of a class diagram in which instances and classes can be displayed. The object is also associated with the cooperation graph, which shows the object prototype (meta-role) in the context.

The UML object diagram is an instance of the class diagram, using almost the same identity as the class diagram. The difference between them is that the UML object graph shows multiple object instances of the class, not the actual class. An object diagram is an instance of a class diagram. Because the object has a life cycle, the object graph can only exist for a certain period of time in the system.

Representation method

There is no need to provide a separate form for UML object graphs. The class diagram contains objects, so a class diagram with only objects but no classes is an "object diagram". However, the phrase "object graph" is very useful in depicting specific uses in all aspects.

Discuss

The object graph shows the set of objects and their relationships, representing the state of the system at a certain time. It contains objects with values, not descriptors, and, of course, in many cases, objects can be prototypes. A cooperation diagram can be used to show an overall model of an object and its relationships that can be instantiated many times. The cooperation diagram contains descriptors of objects and chains (class meta-roles and contact roles). If the collaboration graph is instantiated, an object graph is generated.

The UML object graph does not show the evolution of the system. For this purpose, a collaboration diagram with a message or a sequence diagram can be used to represent an interaction.

Graphical description of object graph

The purpose of UML object Graph

Capture instances and connections

Created during the analysis and design phase

Capture the static part of the interaction

Give examples to illustrate the data / object structure

Describe the transient diagram in detail

Developed by analysts, designers, and code implementers

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