For objects which already exist at the start of the program section, the object symbols are drawn on the upper sheet edge. An object’s lifeline grows in the direction of the lower sheet edge. Objects are shown along the upper sheet edge.Įvery object is on a vertical line - the Lifeline. Classes are not displayed in this diagram. Underlining of the name may be omitted so that no confusion with the class name can occur. Program flow is not always triggered by an object outside of the concerned area, so that in this case no system limit must be set.Īn object is shown by a rectangle containing the name. It usually serves as the start point of the triggering method call. The System Border isolates the concerned part of the program from the rest of the program. The following table contains the sequence diagram symbols. The destruction of an object is represented by a cross on the Lifeline. by calling the method “new”), then the Lifeline of this object begins at this position. If an object is created via the setting of a message (e.g. “arguments” is a comma-separated list of parameter values transferred to the message.The sending of a signal is always as asynchronous character.
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