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UML Class Diagram. Design Elements

UML Class Diagram is a type of Structure Diagrams that shows the classes of a system, attributes, operations, and the relationships between them.

Class Diagram is one of important types of UML Diagrams. UML Class Diagrams are used for static modeling of the system, for data modeling, for conceptual modeling of the application, and for modeling of the system dictionary.

On the Class Diagram, Classes are represented as boxes that consist of three parts: name, attributes of the class, and operations or methods.

Use the following notations to set the visibility of a class member: Public (+), Private (-),
Protected (#), Derived (/), Static (_), Package (~). Notation must be placed before the name of class member.

There are a few types of associations between objects and classes on the Class Diagrams.

Bi-directional associations are represented by a line between two classes, it is default connection between classes.

Uni-directional associations are represented as the unbroken lines with an open arrowhead.

Aggregation is an association with the relation between the whole and its parts, and is represented as empty diamond on the Class Diagram.

Composition is a strong variant of aggregation, represents on as filled diamond.

Generalization or inheritance is when a child object or class assumes all properties of his parent object or class, is represented as empty triangle.

There are four notations: 0..1, 1, 0..*, 1..*, that indicate the multiplicity of associations.

The Rapid UML Solution for ConceptDraw PRO contains 13 vector stencils libraries with 393 interactive shapes that you can use to design your UML diagrams.

To design your own Class Diagram use the UML Class Diagram library.

UML Class Diagram library contains 39 shapes:

  • Class
  • Class 2
  • Object 1
  • Object 2
  • Self association
  • Interface
  • Template class
  • NARY
  • Text Label
  • Symbol { }
  • Symbol << >>
  • Divider (Vertical)
  • Divider
  • Association without ratio
  • Association
  • Association One-to-Many
  • Association Many-to-Many
  • Association One-to-One
  • Inheritance
  • Composition
  • Aggregation
  • Inheritance
  • Dependency
  • Connector
  • Package
  • Frame, fragment
  • Note
  • Callout
  • Component
  • Interface 2
  • Realization
  • Generalization
  • UML Connector (Direct)
  • UML Connector
  • UML Connector (opposite)
  • UML Connector (opposite direction)
  • Association (without aggregation)
  • Note Connector

Pic.1. UML Class Diagram Library

UML Class Diagram: Design Elements

Pic.2. UML Class Diagram Library Elements

ConceptDraw Rapid UML solution provides UML Class Diagram library of vector stencils for drawing the class diagrams using class blocks and assembly connectors.

All libraries for creating UML diagrams are available inside the ConceptDraw PRO. Templates and samples are located in the Rapid UML section of ConceptDraw STORE.

UML Diagram Solution

Pic.3. UML Diagrams solution

Use design element from the UML Class Diagram library to draw your own UML class diagrams of complex systems and software applications.

UML Class Diagram

UML Class Diagram

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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 general issues,classes of a system, attributes, operations, interfaces, inheritance, and the relationships between them.Control Package Class Diagram
Picture: UML Class Diagram Notation
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UML Notation

There are many ways to track the system in a critical situation. To model a system behavior, uml notation is widely used. Usually, an UML diagram consists of elements such as actor and a case. This diagram represents the structure of UML notations. Unified Modeling Language (UML) is used in software engineering to depict graphically the software modeling process. UM Language uses graphic notations for developing models of object-oriented systems. These notations displays requirements, sub-systems, logical and physical elements, etc. We created this diagram using ConceptDraw PRO reinforced with Rapid UML solution. It can be helpful for students on software engineering, when learning UML.uml diagram types list
Picture: UML Notation
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How to create a UML Diagram

ConceptDraw PRO extended with the Rapid UML solution is perfect for drawing professional UML diagrams.UML Class Diagram - Metadata Information Model
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UML Class Diagram Constructor

UML Class Diagrams is a type of static structure diagram that is used both for general conceptual modeling of the systematics of the application, and for detailed modeling translating the models into programming code. It describes the structure of a system by showing the: classes of a system, attributes, operations, and the relationships between them. The Rapid UML Solution for ConceptDraw PRO includes the UML Class Diagram library that helps you to design the UML Class Diagram quick and easy. You can simply and quickly drop the ready-to-use objects from the library into your document to create the UML Class Diagram.UML Class Diagram Constructor
Picture: UML Class Diagram Constructor
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UML Component Diagram. Design Elements

UML Component Diagram illustrates show components are wired together to larger components and software systems that shows the structure of arbitrarily complex systems. Rapid UML Solution for ConceptDraw PRO contains 13 vector stencils libraries with 393 interactive shapes that you can use to design your UML diagrams. To design a Component Diagram use the UML Component Diagram library. UML Component Diagram library contains 36 shapesUML Design Elements: Component (Win, Mac)
Picture: UML Component Diagram. Design Elements
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UML Use Case Diagram Example Registration System

This sample was created in ConceptDraw PRO diagramming and vector drawing software using the UML Use Case Diagram library of the Rapid UML Solution from the Software Development area of ConceptDraw Solution Park. This sample shows the types of user’s interactions with the system and is used at the registration and working with the database system.Registration System UML Use Case Diagram
Picture: UML Use Case Diagram Example Registration System
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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.Entity Relationship Diagram Symbols and Meaning - crow
Picture: ERD Symbols and Meanings
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Basic Flowchart Symbols and Meaning

While creating flowcharts and process flow diagrams, you should use special objects to define different statements, so anyone aware of flowcharts can get your scheme right. There is a short and an extended list of basic flowchart symbols and their meaning. Basic flowchart symbols include terminator objects, rectangles for describing steps of a process, diamonds representing appearing conditions and questions and parallelograms to show incoming data. This diagram gives a general review of the standard symbols that are used when creating flowcharts and process flow diagrams. The practice of using a set of standard flowchart symbols was admitted in order to make flowcharts and other process flow diagrams created by any person properly understandable by other people. The flowchart symbols depict different kinds of actions and phases in a process. The sequence of the actions, and the relationships between them are shown by special lines and arrows. There are a large number of flowchart symbols. Which of them can be used in the particular diagram depends on its type. For instance, some symbols used in data flow diagrams usually are not used in the process flowcharts. Business process system use exactly these flowchart symbols.Flowchart Symbols and Meaning, workflow diagram symbols, process flow diagram symbols
Picture: Basic Flowchart Symbols and Meaning
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IDEF0 Visio

ConceptDraw PRO extended with IDEF0 Diagrams solution from the Software Development area of ConceptDraw Solution Park is a powerful diagramming and vector drawing IDEF0 software. All IDEF0 diagrams created in ConceptDraw PRO are vector graphic documents and can be reviewed, modified and converted to MS Visio XML format. To obtain the IDEF0 Visio documents from ConceptDraw PRO documents use the wide export possibilities of ConceptDraw PRO.IDEF0 Visio
Picture: IDEF0 Visio
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UML Diagram

While developing software, it is very important to have a visual model, because it helps to represent the logic and the architecture of an application. Experienced engineers use UML diagrams to denote relationships between classes and their instances. UML is a general language for a set of diagrams like deployment diagrams, object diagrams or use case diagrams. This diagram represents UML class diagram used for a software system development using an object-oriented method. Class diagrams are categorized as static structure diagrams that depict the physical structure of a system. Class diagram divides a software system's structure into "classes". Classes are defined by the methods and variables of objects. UML Class diagram is used to depict relationships and source code dependencies between objects.UML Diagrams
Picture: UML Diagram
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