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Summary of UML use case diagrams

UML use case diagram is the view of external characteristic description of software products. It describes the requirements of software products from the point of view of users rather than developers, and analyzes the functions and behaviors required by software products.

The UML use case diagram describes a set of use cases, actors, and their relationships, which consists of the following sections:

Use case (Case), actor (Actor). Dependency, generalization and relevance.

The actor in the UML use case view and an entity (which can be anyone or anything) outside the system participate in the execution of the use case in some way

A use case is a narrative document that describes the order in which something happens when participating in the use of the system.

Relationships between UML use case diagrams:

1. Generalization relationship (Generalization):

The generalization relation of the use case is similar to that of the class, that is, in the generalization of the use case, the child use case represents the special form of the parent use case, the child use case inherits the behavior and attributes from the parent use case, and the inherited behavior can be changed by adding behaviors and attributes.

two。 Include relationship (Include):

The inclusion relationship separates the common steps of several use cases into one included use case, and the inclusion relationship between use cases allows the behavior of the provider use case to be included in the customer use case. The inclusion use case is called the customer use case, and the inclusion use case is called the provider use case. Include use cases to provide functionality to customer use cases

3 extended relationship (Extend):

Is a way to insert a new behavior into an existing use case. The base use case provides a set of extension points.. These extension points can add new behaviors. The extension use case provides a set of insert fragments. These fragments can be inserted into the extension point of the underlying use case

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