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In software engineering, a class diagram [1] 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. The class diagram is the main building block of object-oriented modeling.
A classifier is an abstract metaclass classification concept that serves as a mechanism to show interfaces, classes, datatypes and components.. A classifier describes a set of instances that have common behavioral and structural features (operations and attributes, respectively).
UML is a graphical language for visualizing, specifying, constructing, and documenting information about software-intensive systems. [3] UML gives a standard way to write a system model, covering conceptual ideas. [4] [note 2] With an understanding of modeling, the use and application of UML can make the software development process more efficient.
UML 2.0 composite structure diagram. As an example, consider one possible way of modeling production of the Fibonacci sequence. This UML 2.0 composite structure diagram specifies that instances of the 'FibonacciSystem' class are composed of a number of parts. The topmost of these parts is identified as having the classifier 'FibonacciFunction'.
Initially, when n=2, and f(n-2) = 0, and f(n-1) = 1, then f(n) = 0 + 1 = 1. Consider one possible way of modeling production of the Fibonacci sequence.. In the first UML object diagram on the right, the instance in the leftmost instance specification is named v1, has IndependentVariable as its classifier, plays the NMinus2 role within the FibonacciSystem, and has a slot for the val attribute ...
A UML Component with provided and required interfaces. A component [1] in the Unified Modeling Language represents a modular part of a system that encapsulates the state and behavior of a number of classifiers. Its behavior is defined in terms of provided and required interfaces, [2] is self-contained, and substitutable.
In UML 2.4.1, an element is an abstract class with no superclass. [2] It is used as the superclass or base class, as known by object-oriented programmers, for all the metaclasses in the UML infrastructure library. All other elements in the UML inherit, directly or indirectly from Element.
PlantUML source code.. @startuml class Example { +Foo #Bar -Baz +Foo() #Bar() -Baz() } note left of Example::Foo This field is public end note note left of Example::Bar This field is protected end note note left of Example::Baz This field is private end note note right of Example::Foo() This method is public end note note right of Example::Bar() This method is protected end note note right of ...