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The use of object diagrams is fairly limited, namely to show examples of data structure." The latest UML 2.5.1 specification does not explicitly define object diagrams, [4] but provides a notation for "instances" of classifiers. [4]: 126 Object diagrams and class diagrams are closely related [5] and use almost identical notation. [6]
A sample UML class and sequence diagram for the Iterator design pattern. [4] In the above UML class diagram, the Client class refers (1) to the Aggregate interface for creating an Iterator object (createIterator()) and (2) to the Iterator interface for traversing an Aggregate object (next(),hasNext()).
The most prominent example of a Layer 2 Meta-Object Facility model is the UML metamodel, which describes the UML itself. These M2-models describe elements of the M1-layer, and thus M1-models. These would be, for example, models written in UML. The last layer is the M0-layer or data layer. It is used to describe runtime instances of the system. [28]
An example is an adapter that converts the interface of a Document Object Model of an XML document into a tree structure that ... See also the UML class diagram below.
A sample UML class and sequence diagram for the observer design pattern. ... Below is an example written in Java that takes keyboard input and handles each input line ...
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.
In the above UML class diagram, the Director class doesn't create and assemble the ProductA1 and ProductB1 objects directly. Instead, the Director refers to the Builder interface for building (creating and assembling) the parts of a complex object, which makes the Director independent of which concrete classes are instantiated (which ...
The Mediator1 class implements the interaction between Colleague1 and Colleague2. The UML sequence diagram shows the run-time interactions. In this example, a Mediator1 object mediates (controls and coordinates) the interaction between Colleague1 and Colleague2 objects.