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   ► KBRole-Based T...Analysis & UMLUnified Mode...   Print This     
  From the September 2015 Issue of Prestwood eMag
 
Analyst Unified Modeling Language (UML):
Association
 
Posted 10 years ago on 6/30/2008 and updated 11/5/2008
Take Away: An Association is a generic relationship between two classes and is represented a line connecting the two classes. This line can be qualified with the type of relationship, and can also feature multiplicity rules such as one-to-one, one-to-many, many-to-many, 0 or 1 to many, etc.
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KB101262



Association - An Association is a generic relationship between two classes and is represented a line connecting the two classes. This line can be qualified with the type of relationship, and can also feature multiplicity rules such as one-to-one, one-to-many, many-to-many, 0 or 1 to many, etc.

Types of Relationships Include:

  • Inheritance is an "is-a" relationship and is a coding element in which a class makes it possible to define subclasses that share some or all of the main class characteristics.
  • Interfaces is a "behaves-as" or "looks-like" relationship and is an element of coding where you define a common set of properties and methods for use with the design of two or more classes.
  • Aggregation is an "is-part-of" or "has-a" relationship and simply indicates a whole-part relationship.
  • Composition (a.k.a. Composite Aggregation) is a "uses-a" relationship and is a strong type of aggregation and means that a class cannot exist by itself. It must exist as a member of another class. For example, a button class must exist as part of a container such as a form.

More Info

Definition:  Aggregation
Definition:  Composition
Definition:  Dependency

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Definition Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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