They will also have their lifelines according to how long their functions would last. The objects that the system requires or need are all included in designing a UML Sequence diagram are displayed by this symbol. This shape should not include any class attributes. It depicts how an object will interact with the rest of the system. The object name or the class name can be used to name an object (anonymous object). Īn object in UML sequence diagram is represented by a rectangle with the symbol name or label. As long as the messages passes, then the lifeline of the object still goes on. This symbol represents an object’s existence at a specific point in time in the modeled UML sequence diagram. In UML sequence diagram, a lifeline symbol is plotted to let the messages flow through it. A named or labeled rectangular shape symbol may be used to start a lifeline. Ī lifeline is a dashed line that indicates events in Sequence Diagram. A named rectangular shape or an actor UML sequence diagram symbol is used to start a lifeline. The successive events that occur to an object during the charted process are shown by this dashed vertical line. The system events that the actors generate in the sequence are referred to as events.Įxample of these actors are the users of a certain proposed project. They were represented by stick figures which serves as a symbol of a user in the UML sequence diagram. They were given meaning according to their role in the system’s sequence diagram illustration.Īctors are entities that interact with the system while remaining external to it.
Here are the symbols and notations used to design a Sequence Diagram.
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