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,
and the relationships between classes.
Example 1. Control Package Class Diagram
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The following table represents notations that are used on the UML Class Diagrams:
Class represents a set of objects that have the same structure, behavior, and relationships with objects of other classes.
Attribute is a typed value that defines the properties and behavior of the object.
Operation is a function that can be applied to the objects of a given class.
Responsibility is a contract which the class must conform.
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 is a relationship that connect two classes.
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 represents two or more aggregations.
Composition is a strong variant of aggregation when parts cannot be separately of the whole.
Generalization ia an association between the more general classifier and the more special classifier.
Inheritance is a relationship when a child object or class assumes all properties of his parent object or class.
Realization is a relationship between interfaces and classes or components that realize them.
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 shows the quantity of instances of one class that are linked to one instance of the other class.
Package groups the classes and other packages.
Note is a textual explication.
Note connector is a connection between the note and elements.
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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.
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.
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.
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).
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.
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.