What is Association in UML with example?

Asked By: Areceli Teva | Last Updated: 15th June, 2020
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Association classes. 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.

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Beside this, what is Association in UML?

Association is a relationship between classifiers which is used to show that instances of classifiers could be either linked to each other or combined logically or physically into some aggregation. UML specification categorizes association as semantic relationship.

Beside above, what is Association and its types? An association type (also called an association) is the fundamental building block for describing relationships in the Entity Data Model (EDM). In a conceptual model, an association represents a relationship between two entity types (such as Customer and Order ).

Hereof, what is qualified association with example?

Qualified association: Qualified association specifies relation between two object classes and a qualifier. The qualifier is a special attribute that reduces the effective multiplicity of an association. The qualifier distinguishes among the set of objects at the many end of an association.

What is Association class diagram?

In a UML class diagram, you can draw associations between any pair of types. A type is a class, interface, or enumeration. An association indicates that the system you are developing stores links of some kind between the instances of the associated types.

32 Related Question Answers Found

What is difference between aggregation and association?

In Short, a relationship between two objects is referred as an association, and an association is known as composition when one object owns other while an association is known as aggregation when one object uses another object.

What is aggregation explain with example?

Aggregation is a way of composing different abstractions together in defining a class. For example, a car class can be defined to contain other classes such as engine class, seat class, wheels class etc. Other examples of aggregation are: A window class containing menu class, check-box class etc.

Does oop have relationships?

One of the advantages of Object-Oriented programming language is code reuse. Object oriented programming generally support 4 types of relationships that are: inheritance , association, composition and aggregation. All these relationship is based on "is a" relationship, "has-a" relationship and "part-of" relationship.

What is an interface?

In computing, an interface is a shared boundary across which two or more separate components of a computer system exchange information. The exchange can be between software, computer hardware, peripheral devices, humans, and combinations of these.

What is the difference between association and inheritance?


Association vs Inheritance. Another type of relationship between classes is the has-a relationship or association relationship. The 1 near the Course means that 1 course object is associated with the number shown near the other class. In this case it is * which means 0 to many.

What is association end?

An Association End is the connection between lines depicting an Association and the shape. The following properties of the association end can be specified: name, association end type, visibility, multiplicity, qualifier, aggregation kind.

What are different types of aggregation?

Association, Aggregation, Composition, Abstraction, Generalization, Realization, Dependency
  • Association. Association is a relationship between two objects.
  • Aggregation. Aggregation is a special case of association.
  • Composition. Composition is a special case of aggregation.
  • Generalization.
  • Realization.
  • Dependency.

What is the purpose of use case view?

Purpose of Use Case Diagrams
Use case diagrams are used to gather the requirements of a system including internal and external influences. These requirements are mostly design requirements. Hence, when a system is analyzed to gather its functionalities, use cases are prepared and actors are identified.

What is qualified association?

16.15 Qualified Association. A qualified association has a qualifier that is used to select an object (or objects) from a larger set of related objects, based upon the qualifier key. Informally, in a software perspective, it suggests looking things up by a key, such as objects in a HashMap.

What is association end names?


(i) Association end names: An association end names is a name that uniquely identifies one end of an association. It specifies a role of an object of a class which it plays in the association. An association end names is written next to the association line near the class that plays the role.

What are the different visibility symbols in class diagram?

Visibility of Class attributes and Operations
UML identifies four types of visibility: public, protected, private, and package. The +, -, # and ~ symbols before an attribute and operation name in a class denote the visibility of the attribute and operation.

What are the three types of association?

UML has three types of associations in class diagrams (beside generalization): simple association, aggregation and composition. All types of associations may be navigable in one or both directions. This is defined with direction arrows, multiplicity and roles. In a simple association, both classes are equal.

What is the concept of association?

An association is defined as a connection between ideas made mentally, or a connection you see in your head. The definition of an association is a relationship with an individual, group or organization. An example of an association is the friendship you have with a co-worker.

What are the characteristics of association?

Some of the important characteristics of association are as follows:
  • (1) A group of People:
  • (2) Organization:
  • (3) Common Aims and Objectives:
  • (4) Some rules and regulations:
  • (5) Co-operative Spirit :
  • (6) Voluntary Membership :
  • (7) Degree of Permanency:
  • (8) Legal Status :

What is the use of association?


Association indicates the relationship between objects. eg: Computer uses keyboard as input device. An association is used when one object wants another object to perform a service for it. Aggregation is a special case of association.

What is an association and what is its purpose?

The American Society of Association Executives™ (ASAE)—essentially, the association for associations—defines an association as "an organization or group of individuals affiliated with one another who share a common purpose, interest, or mission and exist for the mutual enrichment and advancement of their membership" (

What are three functions of an association?

What are the Purpose, Functions and Usefulness of Association?
  • (i) The personality of a member develops with the help of the association.
  • (ii) The association works for attaining the common objectives of its members.
  • (iii) The association generates a feeling of unity among its members.