Unified Modelling Language
What is UML?
UML stands for Unified Modeling Language. This object-oriented system of notation has evolved from the work of Grady Booch, James Rumbaugh, Ivar Jacobson, and the Rational Software Corporation. These renowned computer scientists fused their respective technologies into a single, standardized mode. Today, UML is accepted by the Object Management Group (OMG) as the standard for modeling object oriented programs.
Types of UML Diagrams
UML defines nine types of diagrams: class (package), object, use case, sequence, collaboration, statechart, activity, component, and deployment.
|Class Diagrams||Class diagrams are the backbone of almost every object oriented method, including UML. They describe the static structure of a system.|
|Package Diagrams||Package diagrams are a subset of class diagrams, but developers sometimes treat them as a separate technique. Package diagrams organize elements of a system into related groups to minimize dependencies between packages.|
|Object Diagrams||Object diagrams describe the static structure of a system at a particular time. They can be used to test class diagrams for accuracy.|
|Use Case Diagrams||Use case diagrams model the functionality of system using actors and use cases.|
|Sequence Diagrams||Sequence diagrams describe interactions among classes in terms of an exchange of messages over time.|
|Collaboration Diagrams||Collaboration diagrams represent interactions between objects as a series of sequenced messages. Collaboration diagrams describe both the static structure and the dynamic behavior of a system.|
|Statechart Diagrams||Statechart diagrams describe the dynamic behavior of a system in response to external stimuli. Statechart diagrams are especially useful in modeling reactive objects whose states are triggered by specific events.|
|Activity Diagrams||Activity diagrams illustrate the dynamics nature of a system by modeling the flow of control from activity. An activity represents an operation on some class in the system that results in a change in the state of the system. Typically, activity diagrams are used to model workflow or business and internal operation.|
|Component Diagrams||Component diagrams describe the organisation of physical software components, including source code, run-time (binary) code, and executables.|
|Deployment Diagrams||Deployment diagrams depict the physical resources in a system, including nodes, components, and connections.|