UML-activity diagram

Activity diagram: a diagram describing the dynamic behavior of the system,It is designed to describe a process or operation..The activity diagram consists of two action statuses.

The following is a summary of the activity diagram:

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Activity graphs have two forms: Common and general, and swimming channels. The difference between the two is that the number of subjects is different. The figure below shows that there are three object customers, systems, and suppliers. It allows users to clearly see the objects or classes involved in the activity and the interaction between them. The lane technology provides convenience for extracting classes and analyzing interactions between objects.

The following is my own activity diagram on the data center billing system.

(1) between students and operators

(2) bring students online and offline

The painting is not good. You are welcome to give your valuable comments.