Unified Modeling Language/Class diagram

From Citizendium
Jump to navigation Jump to search
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.
This article is a stub and thus not approved.
 Main Article
 Discussion
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
Class diagram [?]
 
https://en.citizendium.org/wiki/index.php?title=Unified_Modeling_Language/Class_diagram&printable=yes
More information relevant to Unified Modeling Language.

A class diagram is one of the most popular types of UML diagrams.

Class Diagrams use implements, composition and aggregation relationships. 

----------------------------------------------------
Implementation example:  A fedora is a (type of) hat. 
Arrowhead type:          Unfilled closed triangle.
Arrow direction:         From example to category.

+--------+
| hat    |
+--------+
    ∆
    |
    |
+--------+
| fedora |
+--------+
 
------------------------------------------------------------------
Composition example:  A heart is a non-removable part of a person. 
Arrowhead type:       Solid diamond.
Arrow direction:      From part to whole.

+--------+
| person |
+--------+
    ♦
    |
    |
+--------+
| heart  |
+--------+

----------------------------------------------------------
Aggregation example:  A hat is a removable part of a person. 
Arrowhead type:       Unfilled-diamond(lozenge).
Arrow direction:      From part to whole.

+--------+
| person |
+--------+
    ◊
    |
    |
+--------+
|  hat   |
+--------+

----------------------------------------------------------
Inner Class example:  Tree_search is an inner class of tree.  
Arrowhead type:       Oplus(plus in a circle).
Arrow direction:      From part to whole.
Purpose:              Tree_search is a Search, but Tree_Search 
                      is an inner class of tree.
                      Only trees need a tree_search class 
                      so it is hidden. Some languages do not
                      support inner classes. Java does.

+--------+   +---------+
| tree   |   | search  |
+--------+   +---------+
    ⊕        / \
    |         |
    |         |
+-------------+
| tree_search |
+-------------+
Retrieved from "https://citizendium.org/wiki/index.php?title=Unified_Modeling_Language/Class_diagram&oldid=555593"