![]() ![]() In principle, only the method calls are shown in the sequence diagram. This name can be added to the parameters list in parentheses. The method name is placed on this symbol. When an object calls a method of another object, this is symbolized by a continuous arrow which points to the object from which the method was called. ![]() If an object calls its own method, the Lifeline thickens again. If an object is involved in a method call, it is active. For objects which are re-created within the program section, the symbol is drawn at the level of the method call in the course of which the object was created. 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.
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