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In software engineering, a class diagram [1] in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among objects. The class diagram is the main building block of object-oriented modeling.
In the above UML class diagram, the Client class refers to the Prototype interface for cloning a Product. The Product1 class implements the Prototype interface by creating a copy of itself. The UML sequence diagram shows the run-time interactions: The Client object calls clone() on a prototype:Product1 object, which creates and returns a copy ...
The Object Constraint Language (OCL) for defining rules for model elements; The UML Diagram Interchange that defines how UML 2 diagram layouts are exchanged; Until UML 2.4.1, the latest versions of these standards were: [19] UML Superstructure version 2.4.1; UML Infrastructure version 2.4.1; OCL version 2.3.1; UML Diagram Interchange version 1.0.
Static modeling - use of class diagrams to describe structure; Static operation - an operation that does not relate to a specific object but is at class level; Stereotype - a notation allowing the extension of UML symbols. Some are defined within Profiles. Examples of predefined UML stereotypes are Actor, Exception, Powertype and Utility ...
In the above UML class diagram, the Creator class that requires a Product object does not instantiate the Product1 class directly. Instead, the Creator refers to a separate factoryMethod() to create a product object, which makes the Creator independent of the exact concrete class that is instantiated.
UML (Unified Modeling Language) is a modeling language used by software developers. [1] UML can be used to develop diagrams and provide users (programmers) with ready-to-use, expressive modeling examples. [note 1] Some UML tools generate program language code from UML. [2] UML can be used for modeling a system independent of a platform language.
OCL may now be used with any Meta-Object Facility (MOF) Object Management Group (OMG) meta-model, including UML. [2] The Object Constraint Language is a precise text language that provides constraint and object query expressions on any MOF model or meta-model that cannot otherwise be expressed by diagrammatic notation.
The UML sequence diagram shows the run-time interactions: In this example, the Sender object calls handleRequest() on the receiver1 object (of type Handler). The receiver1 forwards the request to receiver2, which in turn forwards the request to receiver3, which handles (performs) the request.