#Activity diagram uml how to

In other words, it can be said that an activity diagram is an enhancement of the flowchart, which encompasses several unique skills. They are identical to the flowcharts, but they themself are not exactly the flowchart.

#Activity diagram uml how to

How to draw an Activity Diagram?Īn activity diagram is a flowchart of activities, as it represents the workflow among various activities. It is used to depict the flow between several activities. It is the same as that of a flowchart but not exactly a flowchart itself. It does not include the message part, which means message flow is not represented in an activity diagram. It envisions the dynamic behavior of the system as well as constructs a runnable system that incorporates forward and reverse engineering. It mainly models processes and workflows. It can model use cases, classes, interfaces, components, and collaborations. To model the behavior of activities, they can be attached to any modeling element. Why use Activity Diagram?Īn event is created as an activity diagram encompassing a group of nodes associated with edges. Initial State: It depicts the initial stage or beginning of the set of actions.įinal State: It is the stage where all the control flows and object flows end.ĭecision Box: It makes sure that the control flow or object flow will follow only one path.Īction Box: It represents the set of actions that are to be performed. Notation of an Activity diagramĪctivity diagram constitutes following notations: It is an object node that precisely represents one input to or output from the action. It clears out all the messy and complicated thing to manage the execution flow of activities. It is a small rectangle, which is attached to the action rectangle.

A Logical AND operation is performed on all of the inward edges as it synchronizes the flow of input across one single output (outward) edge. Join nodes are the opposite of fork nodes. It split a single inward flow into multiple parallel flows. Whenever a data is received at an inward edge, it gets copied and split crossways various outward edges. It is the same as that of various decision parameters. A fork node consists of one inward edge and several outward edges. But it is used to add more transparency to the activity diagram.įorks and join nodes generate the concurrent flow inside the activity. It is not necessary to incorporate swimlane in the activity diagram. It used to add modularity to the activity diagram. The swimlane is used to cluster all the related activities in one column or one row. The activities are initiated at the initial node and are terminated at the final node. The control flow of activity is represented by control nodes and object nodes that illustrates the objects used within an activity. It may contain action nodes, control nodes, or object nodes. In other words, it can be said that an activity is a network of nodes that are connected by edges.

The categorization of behavior into one or more actions is termed as an activity. Components of an Activity Diagramįollowing are the component of an activity diagram: It encompasses activities composed of a set of actions or operations that are applied to model the behavioral diagram. It is also termed as an object-oriented flowchart. The flow can be sequential, branched, or concurrent, and to deal with such kinds of flows, the activity diagram has come up with a fork, join, etc.

It put emphasis on the condition of flow and the order in which it occurs. The activity diagram helps in envisioning the workflow from one activity to another. It models the concurrent and sequential activities. In UML, the activity diagram is used to demonstrate the flow of control within the system rather than the implementation.