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In software engineering, a class diagram in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among objects. Copy of Voice Mail System-You can edit this template on Creately's Visual Workspace to get started quickly.Adapt it to suit your needs by changing text and adding colors, icons, and other design elements. Easily export it in PNG, SVG, PDF, or JPEG image formats for presentations, publishing, and printouts.

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.

The following features make ConceptDraw DIAGRAM the best UML Software:

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.

TEN RELATED HOW TO's:

Drawing ER diagrams on a Mac →

Database model is a graphic representation need at the beginning of project development. You won't have any problems with drawing ER diagrams on a Mac anymore with ConceptDraw DIAGRAM application. Special libraries that contain all the symbols of both Chen's and Crow’s foot notation allow you to start database modeling within a few minutes. Creating entity-relationship diagrams on Mac is fun and effortless when you use a software designed for professional ERD drawing tailored to specific characteristics of Apple OS X. ConceptDraw DIAGRAM is a business diagramming software for those using OS X. The Entity-Relationship Diagrams solution for ConceptDraw has 2 libraries containing about 50 vector icons, depicting ERD symbols of the most popular Chen's and Crow’s Foot Notations. The other valuable component of the solution is a collection of ERDs samples and templates that can be opened on Macs and PCs.

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How to Draw ER Diagrams →

How to Draw ER Diagrams? With Entity-Relationship Diagram (ERD) solution from the Software Development Area for ConceptDraw Solution Park you are able to draw ER diagram with no problem. It includes 45 predesigned icons advocated by popular Chen's and Crow’s Foot notations that can be used when describing an enterprise database.

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UML Class Diagram Example - Medical Shop →

State Diagram UML of Online Store. This sample was created in ConceptDraw DIAGRAM diagramming and vector drawing software using the UML Class Diagram library of the Rapid UML Solution from the Software Development area of ConceptDraw Solution Park. This sample shows the work of the medical shop and is used at the creation of the medical shop or pharmacy project, for understanding the process of shopping in the medical shop, for keeping purchases, for medical supplies.

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Jacobson Use Cases Diagram →

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ConceptDraw DIAGRAM extended with ATM UML Diagrams Solution from the Software Development Area of ConceptDraw Solution Park is a powerful software for representing the ATM processes, for designing and building banking system and ATMs.

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UML Activity Diagram →

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Email System Class Diagram