The notation used in this diagram type is the basic building block for most other structure diagrams.In UML modeling, interfaces are model elements that define sets of operations that other model elements, such as classes, or components must implement. The class diagram is the.Note: Interfaces may also be used to specify a contract for a use case or subsystem.UML class diagrams consist of classes and their instances (objects) as well as interfaces.They create hierarchical relationships and associations between those elements. Interface Definitions Must Reflect Implementation Language Constraints.Specification: focus is on the interfaces of Abstract Data Type (ADTs) in the software Implementation: describes how classes will implement their interfaces.An interface may participate in generalization, association, dependency and realization relationships.In software engineering, a class diagram 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 (methods), and the relationships among objects. Interfaces on UML class diagrams. Any given class or component may implement zero or more interfaces and one or more classes or components can implement the same interface. Interfaces are implemented, 'realized' in UML parlance, by classes and components - to realize an interface a class or component must implement the operations and attributes defined by the interface.

Stereotype type is usedВ to formally model the semantics of an abstraction and its conformance to a specific interface.For example, the OnInit interface has a hook method named ngOnInit(). To distinguish a type from an interface or a class, prepend a вЂTвЂ™ to every type. You can use interfaces in class diagrams and component diagrams to specify a contract between the interface and the classifier that realizes the interface.A type is a stereotype of a class used to specify a domain of objects, together with the operations (but not the methods) applicable to the object of that type.

For example, an instance of Person in the role of Manager would present a different set of properties than if the instance were playing the role of Mother. When an object plays a particular role, it presents a face to the world, and clients that interact with it expect a certain behavior depending on the role that it plays at the time. Depending on the context, that Person instance may play the role of Mother, Comforter, PayerOfBills, Employee, Customer, Manager, Pilot, Singer, and so on. For example, consider an instance of the class Person. Or, a role is the face that an abstraction presents to the world.

Doing this specifies the face instances of that class put on in the context of the associated object. First, in a class diagram, explicitly type each role that the class plays in its association with other classes. It can be done in two ways: Model all the roles the class of the object may take on at any point in time. Specify the different possible types of that object by rendering each type as a class stereotyped as type (if the abstraction requires structure and behavior) or asВ interface (if the abstraction requires only behavior). To model the dynamic binding of an abstraction to its interface by using the become stereotype in an interaction diagram, showing an object changing from one role to another.

Interface In Class Diagram