The composition is indicated using a straight line with a filled arrowhead at any one of the ends.Īggregation is a part of an association relationship. Here is the main difference between Aggregation and Composition: AggregationĪggregation is one type of association between two objects that is also describing the “have a” relationship.Ĭomposition is a specific type of Aggregation which implies ownership.Īggregation is indicated using a straight line with an empty arrowhead at one end. The number of objects can also be depicted.ĭifference between Aggregation and Composition This type of pairing helps you to define the multiplicity of the constituent part within the assembly as its outcome. Here, car to the wheel is one Aggregation, car to the engine is another aggregation, car to gearbox another, and so on. It is an assembly, and the other parts are its constituents. In a composite aggregation, an object may be a part of only one composite at a time.įor example, your car consists of wheels, engine, gearbox, steering, and the main body, etc. If a folder is deleted, all contained files are removed as well. The folder could contain many files, while each File has exactly one Folder parent.
![staruml multiplicity staruml multiplicity](https://support.content.office.net/ko-kr/media/d8a143c9-49f5-4f92-a816-23601f0eff4d.png)
Aggregation is denoted by a filled diamond while composition is denoted by an empty diamond.Īggregation vs Composition: Key statistics.On the contrary, in composition, deleting a single element affects another associated element. In Aggregation, deleting a single element does not affect another associated element.In Aggregation, linked objects are not dependent upon the other object whereas in composition, objects are highly dependent upon each other.But in a composition relationship, objects that are associated with each other cannot remain in the scope without each other. In an aggregation relationship, objects that are associated with each other can remain in the scope of a system without each other.On the other hand, the composition is indicated using a straight line with a filled arrowhead at any one of the ends. Aggregation is indicated using a straight line with an empty arrowhead at one end.Aggregation is one type of association between two objects describing the “have a” relationship while Composition is a specific type of Aggregation which implies ownership.
#STARUML MULTIPLICITY GENERATOR#
This document is generated by StarUML™ Generator automatically. SetType2 public void SetType2(String Value) SetType public void SetType(IUMLClassifier Value) TypeExpression public String TypeExpression TargetScope public IUMLScopeKind TargetScope Ordering public IUMLOrderingKind Ordering The actual type may be a descendant of the declared type or (for an Interface) a Class that realizes the declared type.Ĭhangeability public IUMLChangeableKind Changeability Specifies whether the targets are ordinary Instances or are Classifiers.ĭesignates the classifier whose instances are values of the feature. This property is only relevant if the multiplicity is greater than one. The ordering must be determined and maintained by Operations that add values to the feature. Specifies whether the set of instances is ordered. In the common case in which the multiplicity is 1.1, then the feature is a scalar that is, it holds exactly one value. The cardinality of the set of values is an implicit part of the feature. The possible number of data values for the feature that may be held by an instance. Additional values may be added to the set of values, but once created a value may not be removed or altered. * addOnly - Meaningful only if the multiplicity is not fixed to a single value. No additional values may be added to a set. * frozen - The value may not be altered after the object is instantiated and its values initialized. * changeable - No restrictions on modification. Whether the value may be modified after the object is created. StructuralFeature is an abstract metaclass. For example, it specifies the multiplicity and changeability of the StructuralFeature. In the metamodel, a StructuralFeature declares a structural aspect of an Instance of a Classifier, such as an Attribute. +- ::Modeling Elements::UML Model Elements::Foundation::Core::UMLFeature All Super interfaces: IUMLFeature All Known Sub interfaces: IUMLAttributeĪ structural feature refers to a static feature of a model element, such as an attribute. +- ::Modeling Elements::UML Model Elements::Foundation::Core::UMLModelElement +- ::Modeling Elements::UML Model Elements::Foundation::Core::UMLElement
![staruml multiplicity staruml multiplicity](https://imgs.developpaper.com/imgs/1926086-20200122163055611-231385885.png)
![staruml multiplicity staruml multiplicity](https://img-blog.csdnimg.cn/img_convert/cdd3ddc4173e251dd2afe313172dbb29.png)
+- ::Modeling Elements::ExtCore Elements::ExtensibleModel +- ::Modeling Elements::Core Elements::Model ::Modeling Elements::Core Elements::Element ::Modeling Elements::UML Model Elements::Foundation::Core SUMMARY: NESTED | FIELD | CONSTR | METHOD UMLStructuralFeature (StarUML 5.0 API Documentation)