In simpler words it depicts how a possible user would interact with the system. Allow entities to request other services, and class roles communicate by sending and receiving information.More Templates What Is a Use Case Diagram?Ī use case diagram is a type of UML diagram that is used to describe the possible usage scenario that a system is developed for. It is used to model the communication content between entities, and information is used to transfer information between entities. Message is a class that defines the exchange of information in interaction and collaboration. It can be understood as the content in a pair of curly braces "" in C language semantics. The narrow rectangle on each lifeline in the sequence diagram represents the activity period. In the sequence diagram, each object and the bottom center have a vertical dotted line, which is the lifeline of the object, and messages between objects exist between the two dotted lines.Īctivation period represents the period during which the object in the sequence diagram performs an operation. Lifeline represents the existence of objects in the sequence diagram over a period of time. ![]() The third method only displays the object name but not the class name. The second method only displays the class name but not the object name, which is an anonymous object. Objects generally include the following three naming methods: Theįirst method includes object names and class names. Object represents the role played by the object in the sequence diagram in the interaction, and is located at the top of the sequence diagram and represents the object. System roles can be people or other systems or subsystems. The sequence diagram includes the following elements: roles, objects, lifelines, activation periods and messages. When a use case behavior is executed, each message in the sequence diagram corresponds to a trigger event that causes a transition in a class operation or state machine. It can represent the behavior sequence of a use case. It shows the dynamic collaboration between multiple objects by describing the time sequence of sending messages between objects. Sequence diagram (Sequence Diagram), also known as sequence diagram or sequential diagram, is a UML behavior diagram. Later, we will add the basic concepts related to the sequence diagram: But also remember, don’t be subject to tools, don’t become slaves to tools. The biggest difference between humans and animals is that they can use tools. ![]() In addition, nonsense, if the business wants to understand it, it doesn't matter if you use any tools, even if you don't even use them, to draw directly. Students who are interested can explore again. I tried it briefly and found it was really useful. Of course, this tool still has many useful things. The main thing is to be able to express the business clearly through the diagram. The tools are simple, basically just two clicks of the mouse, and everyone will understand after a bit of exploration. There is also this document, the steps are written in more detail: In addition, the article written by this great god 6 years ago is more practical: Of course, if you want to know more about StarUML applications, you can refer to: In the use case diagram mode, it is different from the left side of the sequence distribution mode. ![]() That is, you should pay attention to the difference between the following two pictures: In fact, on the use case diagram, right-click, select Add Diagram -> Sequence Diagram, and then under the new tab, create the corresponding Object and so on. ![]() Many people don't know how the vertical line came from. Scenario 3: Brief description of another scenario Scenario 2: Another brief sequence diagram:Ĥ. So I was looking for a tool: startUML, of course, there are still many tools such as sequence diagrams and modeling, such as:Īfter downloading and installing, I used it to draw a few simple pictures:ģ. I used visio to draw a flow chart, and later I felt that drawing a timing diagram was the clearest. When writing an upgrade plan, I found that the text description for a long time, many sentences are still not easy to be understood by people.
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