Package diagrams have symbols defining a package that look like a folder.Īctivity diagrams have symbols for activities, states, including separate symbols for an initial state and a final state. Multiplicity is usually shown with a number at one end of the arrow and a * at the other. Using > allows you to indicate properties of that dependency. Dependencies are marked with a dashed line with an arrow. Aggregation is shown with an empty diamond. Composition is shown with a filled in diamond. Generalization and Inheritance are denoted with empty arrowheads. Lines are also important symbols to denote relationships between components. Visibility of any class members are marked by notations of A class symbol can also be divided to show a class's operations, attributes, and responsibilities. For example, there are symbols for active classes and interfaces. There are many different types of UML diagrams and each has a slightly different symbol set.Ĭlass diagrams are perhaps one of the most common UML diagrams used and class diagram symbols center around defining attributes of a class. Learn more.ĭeployment diagrams depict the physical resources in a system, including nodes, components, and connections.
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Learn moreĬomponent Diagram Component diagrams describe the organization of physical software components, including source code, run-time (binary) code, and executables. State diagrams are especially useful in modeling reactive objects whose states are triggered by specific events. State Diagram Statechart diagrams, now known as state machine diagrams and state diagrams describe the dynamic behavior of a system in response to external stimuli. In many ways, a communication diagram is a simplified version of a collaboration diagram introduced in UML 2.0. They describe both the static structure and the dynamic behavior of a system. They're a special instance of a sequence diagram, except time is shown to increase from left to right instead of top down.Ĭommunication diagrams model the interactions between objects in sequence. You should use the same notation on interaction overview diagrams that you would see on an activity diagram.Ī timing diagram is a type of behavioral or interaction UML diagram that focuses on processes that take place during a specific period of time. They model a sequence of actions and let you deconstruct more complex interactions into manageable occurrences. Interaction overview diagrams are a combination of activity and sequence diagrams. Sequence Diagram Sequence diagrams describe interactions among classes in terms of an exchange of messages over time. Typically, activity diagrams are used to model workflow or business processes and internal operation. An activity represents an operation on some class in the system that results in a change in the state of the system. Learn moreĪctivity Diagram Activity diagrams illustrate the dynamic nature of a system by modeling the flow of control from activity to activity. Use Case Diagram Use case diagrams model the functionality of a system using actors and use cases. They can be used to test class diagrams for accuracy.Ĭomposite structure diagrams show the internal part of a class. Object diagrams describe the static structure of a system at a particular time. Package diagrams organize elements of a system into related groups to minimize dependencies between packages. Package diagrams are a subset of class diagrams, but developers sometimes treat them as a separate technique. Watch this short video about UML Class Diagrams They describe the static structure of a system. These diagrams are organized into two distinct groups: structural diagrams and behavioral or interaction diagrams.Ĭlass Diagram Class diagrams are the backbone of almost every object-oriented method, including UML. The current UML standards call for 13 different types of diagrams: class, activity, object, use case, sequence, package, state, component, communication, composite structure, interaction overview, timing, and deployment. To learn more about creating UML diagrams: The key to making a UML diagram is connecting shapes that represent an object or class with other shapes to illustrate relationships and the flow of information and data. It also renamed statechart diagrams to state machine diagrams, also known as state diagrams. The four new diagrams are called: communication diagram, composite structure diagram, interaction overview diagram, and timing diagram. The original UML specified nine diagrams UML 2.x brings that number up to 13.Added the ability to define a hierarchy and decompose a software system into components and sub-components.Improved integration between structural models like class diagrams and behavior models like activity diagrams.UML 2.0 helped extend the original UML specification to cover a wider portion of software development efforts including agile practices. UML stands for Unified Modeling Language.
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