In UML models, an aggregation relationship shows a classifier as a part of or subordinate to another classifier. An aggregation is a special type of association in which objects are assembled or configured together to create a more complex object. An aggregation describes a group of objects and ...
Show activity on this post. When a class holds a type of another class as an attribute, what kind of relationship is this - association or aggregation? e.g. a Flight class holding a type of City class as an attribute called Destination - is this an association or aggregation? What would...
Naturally, composition implies an object being a part of a larger one. In case of interfaces only the interface is a part of the containing larger object. However, this is still a composition in a UML meaning. The Tyre object shouldn't exist without an owning Car object, doesn't matter ...
UML helps in figuring out how one or more things are associated with each other. The most common type of relationship is Association. Let’s have a look at it in detail. In this article 01 What is an Association Relationship? 02 Aggregation vs Composition 03 Is Composition Better than ...
One of the most frequent sources of confusion in the UML is aggregation and composition. It's easy to explain glibly: Aggregation is the part-of relationship. It's like saying that a car has an engine and wheels as its parts. This sounds good, but the difficult thing is considering what...
The relationship between Car and its Engine is called Composition. Because its Engine cannot be used in any other car. 汽车与专属的发动机之间的关系是Composition。因为发动机离开汽车后,将没有单独存在的意义。 The relationship between Classroom and Students is called Aggregation. Because each one can st...
http://ootips.org/uml-hasa.html中如此解释: Aggregation is the typical whole/part relationship. This is exactly the same as an association with the exception that instances cannot have cyclic aggregation relationships (i.e. a part cannot contain its whole). ...
Aggregation denotes whole/part relationships whereas associations do not. However, there is not likely to be much difference in the way that the two relationships are implemented. That is, it would be very difficult to look at the code and determine whether a particular relationship ought to be...
It's important to note that theaggregation link doesn't state in any way that Class A owns Class B nor that there's a parent-child relationship(when parent deleted all its child's are being deleted as a result) between the two. Actually, quite the opposite! The aggregation link is usua...
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