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UML(Unified modeling language) is a unified modeling language, which is a graphical language supporting modeling and software system development.

The tool used is IBM Rational Rose.

UML(Unified Modeling Language)

Use Case Diagram: Describe what functions the system participants have available in the system.

Class diagram: describes the relationship between classes

Association: Global

Dependency: Locality

Sequence diagram: the chronological interaction of messages between objects (critical logic)

1. The role of use case diagram

Use case diagrams describe the functionality of a system from the user's point of view. They are often used to describe systems and subsystems.

2. Two elements and four relationships in the use case diagram

The two elements are: Actor and Use Case.

The four relationships are: Association, Include, Extend, and Generalization.

2.1, association

Associations represent communications between actors and use cases. Note: Try to avoid intersection of association lines, so as not to affect the display effect.

2.2 Generalization relation

In use case diagrams, generalization relationships can be used to describe common behavior among multiple actors. Participants can mean either "system users" or "other systems interacting with the system being built."

2.3 and inclusion relationships.

2.4 extended relationship

3. Use case diagram of online mall

Use Case Diagram Summary

(1) The best way to start with a use-case diagram is to analyze the participants in the system and consider how each participant uses the system.

(2) for the user to see, so avoid using technical terms in the figure

(3) Not a specification of requirements or functions, only showing and reflecting the requirements themselves described

(4) externally visible system function units (use case diagrams can be classified into levels)

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