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.
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 |
 |
Class represents a set of objects that have the same structure, behavior, and relationships with objects of other classes. |
| Attribute |
 |
Attribute is a typed value that defines the properties and behavior of the object. |
| Operation |
|
Operation is a function that can be applied to the objects of a given class. |
| Responsibility |
|
Responsibility is a contract which the class must conform. |
| 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 |
|
Association is a relationship that connect two classes. |
| 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 |
|
N-ary association represents two or more aggregations. |
| Composition |
|
Composition is a strong variant of aggregation when parts cannot be separately of the whole. |
| Generalization |
|
Generalization ia an association between the more general classifier and the more special classifier. |
| Inheritance | 
|
Inheritance is a relationship when a child object or class assumes all properties of his parent object or class. |
| Realization |
|
Realization is a relationship between interfaces and classes or components that realize them. |
| Dependency |
|
Dependency is a relationship when some changes of one element of the model can need the change of another dependent element. |
| << >> |
|
Allows to define the properties of the dependency relationship between classes or classes and packages. |
| { } |
|
Allows to indicate the additional properties of association. |
| Multiplicity |
|
Multiplicity shows the quantity of instances of one class that are linked to one instance of the other class. |
| Package |
|
Package groups the classes and other packages. |
| Note |
|
Note is a textual explication. |
| Note connector |
|
Note connector is a connection between the note and elements. |
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- You don't need to be an artist to draw professional looking diagrams in a few minutes.
- Large quantity of ready-to-use vector objects makes your drawing diagrams quick and easy.
- Great number of predesigned templates and samples give you the good start for your own diagrams.
- 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.
- All ConceptDraw DIAGRAM documents are vector graphic files and are available for reviewing, modifying, and converting to a variety of formats: image, HTML, PDF file, MS PowerPoint Presentation, Adobe Flash, MS Visio.
- Using ConceptDraw STORE you can navigate through ConceptDraw Solution Park, managing downloads and updates. You can access libraries, templates and samples directly from the ConceptDraw STORE.
- If you have any questions, our free of charge support is always ready to come to your aid.
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