Class diagrams
are used to display diagam several classes and packages that exist in the
system / software we're using .
Class diagram gives us a picture ( static diagram ) of the
system / software and relas - relationships that exist therein .
Class Definition
Diagram
Class is a collection of objects with and that have a common
structure , common behavior , common relationships , and semantic / general
word . Classes determined / discovered by examining objects in sequence
diagrams and collaboration diagrams . A class is described as a square with
three parts of the room . Class should be named using a noun according to
domain / section / group ( Jeffery L. Whitten et al , 2004) .
Class Diagram is a diagram that shows the existing classes
of a system and its relationship with logic. Class diagrams describe the static
structure of a system . Because the class diagram is the backbone or basic
strength of almost any object -oriented method including UML ( Henderi , 2008)
. While according to ( Jeffery L. Whitten et al 2004:432 ) class diagram is a
graphic image of the static object structure of a system , showing object
classes that make up a system and also the relationship between the object
class .
Elements - elements relevant in modeling UML class diagram
consists of : classes , class structure , the nature of class ( class behavior)
, association / union ( association ) , collection / unity ( aggregation ) ,
dependency (dependency ) , derivatives relations , diversity and navigation
indicators , and role name ( role / task name ) .
Class diagram symbols
1 . Class : Class is a block - the building blocks of class
-oriented programming obyek.Sebuah described as a box that is divided into 3
parts . The upper part is a part of the class name . Defines the center of the
property / class attribute . The final section defines methodmethod of a clas .
2 . Association : An association is a relationship between
the 2 most common class and is represented by a line connecting the two classes
. This line could symbolize the types of relationship and also can display the
multiplicity of laws in a relationship . ( Example : One -to -one , one-
to-many , many-to -many )
3 . Composition : If a class can not stand alone and must be
part of another class , then the class has a Composition relation to the class
in which he relies . A composition relationship is described as a line with the
tip of a parallelogram -shaped features / solid
4 . Dependency : Sometimes a class uses another class . This
is called a dependency . Generally use the dependency is used to indicate
operation in a class that uses another class . A dependency is represented as a
dotted arrow .
5 . Aggregation : Aggregation indicates a whole part
relationship and is usually referred to as relations .
