About Class Diagram:
Class diagrams model
class structure and contents using design elements such as classes, packages
and objects. Class diagrams describe three different perspectives when
designing a system, conceptual, specification, and implementation. Classes
are composed of three things: a name, attributes, and operations. Class
diagrams also display relationships such as containment, inheritance,
associations and others. The association relationship is the most common
relationship in a class diagram. The association shows the relationship
between instances of classes. The multiplicity of the association denotes
the number of objects that can participate in then relationship.
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