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DIAGRAM 14

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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  1. You don't need to be an artist to draw professional looking diagrams in a few minutes.
  2. Large quantity of ready-to-use vector objects makes your drawing diagrams quick and easy.

    uml class diagram - symbols

  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.
  5. 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.

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  6. 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.

    uml class diagram solution

  7. If you have any questions, our free of charge support is always ready to come to your aid.




TEN RELATED HOW TO's:

ERD Symbols and Meanings →

A database is a data collection, structured into some conceptual model. Two most common approaches of developing data models are UML diagrams and ER-model diagrams. There are several notations of entity-relationship diagram symbols and their meaning is slightly different. Crow’s Foot notation is quite descriptive and easy to understand, meanwhile, the Chen notation is great for conceptual modeling. An entity relationship diagrams look very simple to a flowcharts. The main difference is the symbols provided by specific ERD notations. There are several models applied in entity-relationship diagrams: conceptual, logical and physical. Creating an entity relationship diagram requires using a specific notation. There are five main components of common ERD notations: Entities, Actions, Attributes, Cardinality and Connections. The two of notations most widely used for creating ERD are Chen notation and Crow foot notation. By the way, the Crow foot notation originates from the Chen notation - it is an adapted version of the Chen notation.ERD Symbols and Meanings
Picture: ERD Symbols and Meanings
Related Solution:

ConceptDraw DIAGRAM ER Diagram Tool →

Database design is an important part of any project, as databases become more and more complex nowadays. To make the model more representative, entity relationship diagrams are widely used in software engineering area. These diagrams show sets of entities as rectangles connected via lines labeled with their cardinalities. This an example of the ER-diagram developed to store information regarding some online role-playing game. It includes three main elements of ER diagram: entities, relationships and attributes. The entities, attributes and relationships on this ER-diagram is depicted according to the Chen's notation. Chen's notation for Entity Relationship diagrams admits using of rectangles to depict entities, ovals for attributes and ,at least, diamonds to show relationships. ConceptDraw Entity-Relationship Diagrams solution was applied as ERD software to create this diagram.ConceptDraw DIAGRAM ER Diagram Tool *
Picture: ConceptDraw DIAGRAM ER Diagram Tool
Related Solution:

UML Sample Project →

Unified Modeling Language (UML) is a graphical modeling language for describing, visualizing, projecting and documenting of object oriented systems. UML digram is used for modeling of organizations and their business processes, for development the big projects, the complex software applications. Comprehensive UML diagram allows to create the set of interrelated documents that gives the complete visual representation of the modeling system.UML Sample Project *
Picture: UML Sample Project
Related Solution:

Flowchart Components →

The ConceptDraw Flowchart component includes a set of samples and templates. This geathered as flowchart maker toolbox which focused on drawing flowcharts of any industry standards.Flowchart Components
Picture: Flowchart Components
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OMT Method →

This sample shows the OMT method. It was created in ConceptDraw DIAGRAM diagramming and vector drawing software using the Rapid UML Solution from the Software Development area of ConceptDraw Solution Park. All diagrams produced with ConceptDraw DIAGRAM are vector graphic documents and are available for reviewing, modifying, and converting to a variety of formats (image, HTML, PDF file, MS PowerPoint Presentation, Adobe Flash or MS Visio XML).OMT Method *
Picture: OMT Method
Related Solution:

Data Flow Diagram Symbols. DFD Library →

Any information system receives data flows from external sources. In order to visualize them there is a list of data flow diagram symbols that describes how the system components cooperate. If you want to create a data flow diagram, ConceptDraw DIAGRAM Solution Park has DFD Library that contains both Yourdon and Gane-Sarson notations. This figure shows the content of vector libraries, delivered with ConceptDraw solution for data flow diagram (DFD). There are three libraries composed from about 50 vector objects used to make data flow diagrams. They include a complete set of objects utilized by Yourdon-Coad and Gane-Sarson notations - two primary notations that are apply for data flow diagramming. Also, one can discover additional "Data flow diagram (DFD)" library that provides a data flow diagram elements for designing level 1 and context-level data flow diagrams.Data Flow Diagram Symbols. DFD Library *
Picture: Data Flow Diagram Symbols. DFD Library
Related Solution:

Taxi Service Data Flow DiagramDFD Example →

This sample shows the Data Flow Diagram of the Taxi Service and interactions between the Clients, Operators and Divers, as well as Orders and Reports databases.Taxi Service Data Flow Diagram<br>DFD Example *
Picture: Taxi Service Data Flow DiagramDFD Example
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UML Diagram for System →

This sample shows the UML Class Diagram of delivery system. On this diagram you can see the classes that are connected with aggregation and composition associations indicated with the multiplicity. This sample can be used by delivery services, postal services.UML Diagram for System *
Picture: UML Diagram for System
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DIAGRAM 14