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The diagram on top shows Composition between two classes: A Car has exactly one Carburetor, and a Carburetor is a part of one Car. Carburetors cannot exist as separate parts, detached from a specific car. The diagram on bottom shows Aggregation between two classes: A Pond has zero or more Ducks, and a Duck has at most one Pond (at a time).
In aggregation, the object may only contain a reference or pointer to the object (and not have lifetime responsibility for it). Sometimes aggregation is referred to as composition when the distinction between ordinary composition and aggregation is unimportant. The above code would transform into the following UML Class diagram:
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UML class diagram Composition and aggregation. In object-oriented programming this relationship can be represented with a Unified Modeling Language Class diagram. This has-a relationship is also known as composition. As you can see from the Class Diagram on the right a car "has-a" carburetor, or a car is "composed
A sample UML class and sequence diagram for the Bridge design pattern. [3]In the above Unified Modeling Language class diagram, an abstraction (Abstraction) is not implemented as usual in a single inheritance hierarchy.
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()).
UML diagram of a simple association between two classes. This is an update of KP-UML-Aggregation-20060325.svg of Karl Pietrzak. ... page uses this file: Class diagram ...
A sample UML class and object diagram for the Composite design pattern. [5] In the above UML class diagram, the Client class doesn't refer to the Leaf and Composite classes directly (separately). Instead, the Client refers to the common Component interface and can treat Leaf and Composite uniformly.