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
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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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