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Object composition using UML properties to compose objects. In UML modeling, objects can be conceptually composed, independently of the implementation with a programming language. There are four ways of composing objects in UML: property, association, aggregation and composition: [4] A property represents an attribute of the class.
The composite aggregation (colloquially called composition) relationship is a stronger form of aggregation where the aggregate controls the lifecycle of the elements it aggregates. The graphical representation is a filled diamond shape on the containing class end of the line that connect contained class(es) to the containing class.
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 of" a carburetor.
Composition over inheritance (or composite reuse principle) in object-oriented programming (OOP) is the principle that classes should favor polymorphic behavior and code reuse by their composition (by containing instances of other classes that implement the desired functionality) over inheritance from a base or parent class. [2]
Aggregation - 1. a special type of association used to represent a stronger relationship between two classes than a regular association; typically read as "owns a", as in, "Class A owns a Class B". A hierarchy of classes where the child object may or may not continue to exist if the parent object is destroyed; see 'composition'.
2007-01-03 22:11 Mikm 400×143× (7044 bytes) Diagram showing an example of aggregation and composition in UML. 2007-01-03 21:53 Mikm 400×143× (6972 bytes) Diagram showing an example of aggregation and composition in UML.
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Also take the point about the carburetor. The diagram in the article describes this relationship as composition - but I would have thought the life-line of a carburetor is not implicitly tied to the life-line of the car (which would be the definition of composition), and so this too would be aggregation. Ultimately: I agree.