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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