It’s shown by an arrow going from a lifeline to an endpoint, a filled circle or an x. It can be shown by an arrow with an x at the end.Ī message sent from an unknown recipient, shown by an arrow from an endpoint to a lifeline.Ī message sent to an unknown recipient. This is a message that destroys an object. Similar to a return message, it’s depicted with a dashed line and an open arrowhead that points to the rectangle representing the object created. This is a message that creates a new object. Like synchronous messages, they are drawn with an arrow connecting two lifelines however, the arrowhead is usually open and there’s no return message depicted.Ī reply message is drawn with a dotted line and an open arrowhead pointing back to the original lifeline.Ī message an object sends to itself, usually shown as a U shaped arrow pointing back to itself. It’s usually drawn using a line with a solid arrowhead pointing from one object to another.Īsynchronous messages don’t need a reply for interaction to continue. Ī synchronous message requires a response before the interaction can continue. Place the condition for exiting the loop at the bottom left corner in square brackets. When that object’s lifeline ends, you can place an X at the end of its lifeline to denote a destruction occurrence.Ī repetition or loop within a sequence diagram is depicted as a rectangle. Objects can be terminated early using an arrow labeled “>” that points to an X. Note contains comments or textual information. Generalization is a relationship in which one model element (the child) is based on another model element (the parent).Īssociation is a relationship between two classifiers, such as classes or use cases, that describes the reasons for the relationship and the rules that govern the relationship.Ĭonstraint is an extension mechanism that enables you to refine the semantics of a UML model element. An aggregation describes a group of objects and how you interact with them.ĭependency relationship is a relationship in which one element, the client, uses or depends on another element, the supplier.Ĭomposition represents whole-part relationships and is a form of aggregation. The operations describe how a class interacts with data.Īggregation is a special type of association in which objects are assembled or configured together to create a more complex object. Displayed in list format, each operation takes up its own line. Bottom section: Includes class operations (methods).This is only required when describing a specific instance of a class. Use this section to describe the qualities of the class. ![]() Middle section: Contains the attributes of the class.This section is always required, whether you are talking about the classifier or an object. Upper section: Contains the name of the class.Classes and subclasses are grouped together to show the static relationship between each object. The top row contains the name of the class, the middle row contains the attributes of the class, and the bottom section expresses the methods or operations that the class may use. The class shape itself consists of a rectangle with three rows. Class diagrams are one of the most useful types of diagrams in UML as they clearly map out the structure of a particular system by modeling its classes, attributes, operations, and relationships between objects.
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