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UML Class Diagram Notation

When it comes to system construction, a class diagram is the most widely used diagram. UML Class Diagrams is a type of static structure diagram that is used for general conceptual modeling of the systematics of the application. Such a diagram would illustrate the object-oriented view of a system . The object orientation of a system is indicated by a class diagram. It describes the structure of a system by showing the:

  • classes of a system,
  • attributes,
  • objects,
  • operations,
  • and the relationships between classes.

UML Class Diagram Notation *

Example 1. Control Package Class Diagram

ConceptDraw DIAGRAM is designed to help you create UML diagrams quickly and easily. You'll get ready-made templates, examples and symbols as well as tools specifically designed to build the diagram you need.



Video. How To Create UML Diagram (2min 25sec)


The following table represents notations that are used on the UML Class Diagrams:

Diagram element Graphical presentation Description
Class UML Class Diagram Notation - Class Class represents a set of objects that have the same structure, behavior, and relationships with objects of other classes.
Attribute UML Class Diagram Notation - Attributes Attribute is a typed value that defines the properties and behavior of the object.
Operation UML Class Diagram Notation - Operation Operation is a function that can be applied to the objects of a given class.
Responsibility UML Class Diagram Notation - Responsibility Responsibility is a contract which the class must conform.
Interface UML Class Diagram Notation - Interface Interface is an abstract class that defines a set of operations that the object of the class associated with this interface provides to other objects.
Association UML Class Diagram Notation - Association Association is a relationship that connect two classes.
Aggregation UML Class Diagram Notation - Aggregation Aggregation is an association with the relation between the whole and its parts, the relation when one class is a certain entity that includes the other entities as components.
N-ary Association UML Class Diagram Notation - N-ary Association N-ary association represents two or more aggregations.
Composition UML Class Diagram Notation - Composition Composition is a strong variant of aggregation when parts cannot be separately of the whole.
Generalization UML Class Diagram Notation - Generalization Generalization ia an association between the more general classifier and the more special classifier.
Inheritance UML Class Diagram Notation - Inheritance Inheritance is a relationship when a child object or class assumes all properties of his parent object or class.
Realization UML Class Diagram Notation - Realization Realization is a relationship between interfaces and classes or components that realize them.
Dependency UML Class Diagram Notation - Dependency Dependency is a relationship when some changes of one element of the model can need the change of another dependent element.
<< >> UML Class Diagram Notation - Relationship Allows to define the properties of the dependency relationship between classes or classes and packages.
{ } UML Class Diagram Notation - additional properties of association Allows to indicate the additional properties of association.
Multiplicity UML Class Diagram Notation - Multiplicity Multiplicity shows the quantity of instances of one class that are linked to one instance of the other class.
Package UML Class Diagram Notation - Package Package groups the classes and other packages.
Note UML Class Diagram Notation - Note Note is a textual explication.
Note connector UML Class Diagram Notation - Note connector Note connector is a connection between the note and elements.


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  3. Great number of predesigned templates and samples give you the good start for your own diagrams.
  4. ConceptDraw DIAGRAM provides you the possibility to use the grid, rules and guides. You can easily rotate, group, align, arrange the objects, use different fonts and colors to make your diagram exceptionally looking.
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  7. If you have any questions, our free of charge support is always ready to come to your aid.




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