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What is association in UML diagram?
In UML diagrams, an association class is a class that is part of an association relationship between two other classes. For example, a class called Student represents a student and has an association with a class called Course, which represents an educational course.
How is an association represented in UML?
Association describes how the elements in a UML diagram are associated. In simple words, it describes how many elements are taking part in an interaction. Association is represented by a dotted line with (without) arrows on both sides. Association is used to represent the relationship between two elements of a system.
What is aggregation in UML class diagram?
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.
What kind of relationship is an association in UML?
UML specification categorizes association as semantic relationship . Some other UML sources also categorize association as a structural relationship . Wikipedia states that association is instance level relationship and that associations can only be shown on class diagrams .
When do we use the term generalization in UML?
Generalization is the term that we use to denote abstraction of common properties into a base class in UML. The UML diagram’s Generalization association is also known as Inheritance. When we implement Generalization in a programming language, it is often called Inheritance instead.
How to draw an association between two classifiers?
Any association may be drawn as a diamond (larger than a terminator on a line) with a solid line for each association end connecting the diamond to the classifier that is the end’s type. N-ary association with more than two ends can only be drawn this way.
What does orthogonal mean in UML 2.4 specification?
UML 2.4 specification states that for the association: ” Aggregation type, navigability, and end ownership are orthogonal concepts,… ” which is clearly an overstatement. Orthogonal usually means completely independent.