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![]() ![]() Messages between objects are represented by arrows that point from sender object to the receiver object.Įverything in an object-oriented system is accomplished by objects. Each object also has its timeline represented by a dashed line below the object. Often, an anonymous object (:Account) may be used to represent any object in the class. Object names can be specific (e.g., myAccount) or they can be general (e.g., myAccount :Account). These indicate the existence of the object. A lifeline is represented by dashed vertical line drawn below each object. LifelineĮntities of participants in a collaboration (scenario) are written horizontally across the top of the diagram. The three ways of naming an object are shown in Figure below. ![]() An object can be named in one of three ways: the object name, the object name and its class, or just the class name (anonymous object). In the UML, an object in a sequence diagram is drawn as a rectangle containing the name of the object, underlined. ![]()
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