Association vs Dependency (Offbeat)

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Association vs Dependency (Offbeat)

Association vs Dependency (Offbeat)

2003-12-30 - By ashraf galal

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Reply: 1 2 3 4 5 6 7 8 9 10 >>

<html><div style='background-color:'>ShriKant; 
Dependency relates the model elements
themselves and does not require a set of instances for its meaning.<?xml
:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o
:p>
 <o:p></o:p>
Dependency indicates a situation in which a
change to the supplier may require a change to or indicate a change in meaning
of the client in the dependency. <o:p></o:p>
 <o:p></o:p>
 <o:p></o:p>
1-     has a reference to an object directly.<o:p></o:p>
InstanceOf and  abstraction are example of this type.  <o:p></o:p>
2-     has a reference to an object indirectly via some operation parameters:<o
:p></o:p>
A template class is an example of
this type.<o:p></o:p>
You can not use a template directly,
you have to instantiate it first.<o:p></o:p>
Instantiation involves binding these
formal template parameters to actual ones. <o:p></o:p>
The result is a concrete class hat
can be used as any ordinary one. <o:p></o:p>
&nbsp
;Dependency between packages is another example. <o:p></o:p>
 <o:p></o:p>
 <o:p></o:p>
Also I would like to keep your attention
that association and generalization fit within the general definition of
dependency, but they have their own model representation and notation and are
not usually considered to be dependency (UML).<o:p></o:p>
 <o:p></o:p>
So we need to make explicit relationship
between UML and J2EE. <o:p></o:p>
   
<DIV>Ashraf Galal (416)804-8359</DIV>>From: ShriKant Vashishtha
<SHRIKANT.VASHISHTHA@(protected)>>Reply-To: An interest list for Sun Java
Center J2EE Pattern Catalog <J2EEPATTERNS-INTEREST@(protected)>>To:
J2EEPATTERNS-INTEREST@(protected) >Subject: Re: Association vs Dependency
(Offbeat) >Date: Tue, 30 Dec 2003 09:01:54 -0600 > >Hi Ashraf, > &gt
;I am quite clear regarding unidirectional and bidirectional association. &gt
;But could you please elaborate the following points more, may be with some &gt
;examples. > >- has a reference to an object directly. >- Has a
reference to an object indirectly via some operation >parameters. > &gt
;Thanks >-ShriKant > > > > >ashraf galal <ASHRAFWG@(protected)
>>Sent by: An interest list for Sun Java Center J2EE Pattern Catalog >
<J2EEPATTERNS-INTEREST@(protected)> >12/29/2003 11:22 PM >Please respond
to An interest list for Sun Java Center J2EE Pattern >Catalog &gt
; > > To: J2EEPATTERNS-INTEREST@(protected) > cc: > Subject: Re:
Association vs Dependency (Offbeat) > > >Actually, these concepts is
UML not a java. You are quite well >understanding but I would like to
illustrate the difference between them >and give an example. > /> &gt
;Dependency : >Anytime a class uses another class in some fashion, a
dependency exists >between the two. >A dependency exists of a class: >
- has a reference to an object directly. >- Has a local variable based on
another class. >- Has a reference to an object indirectly via some operation
>parameters. >- Uses a class's static operation >Also there are
dependency between packages. > >Association: >There is two types of
association, unidirectional and bi-directional >associations. &gt
;Unidirectional association implies that an object of the class may invoke &gt
;methods on the other class. >In java, this manifest itself as an instance
variables on the class that >may invoke methods. > >Example: &gt
;Public class customer > { > ?. > Public Address homeAddress; > >
?? > } > >public class Address { >?.. >} > >bi-directional
association means that either object in the association may >invoke methods
on other. >In java, this results in an instance variable on each class based
on the >type of the other class. > >Example; >Public class Team &gt
; { > LinkedList teamPlayers = new LikedList(); > teamPlayers.add(new
teamPlayer(?)); > ??? } > > public class teamPlayer { > Team
memberOf; > ?. > } > >Ashraf Galal >(416)804-8359 > >From:
ShriKant Vashishtha >Reply-To: An interest list for Sun Java Center >J2EE
Pattern Catalog >To: J2EEPATTERNS-INTEREST@(protected) >Subject: &gt
;Association vs Dependency (Offbeat) >Date: Sun, 28 Dec 2003 14:17:03 -0800
> > >Hi All, > >I am slightly confused
in finding the difference between >association and dependency. > >For
me, whenever the variable is intialized >at a local scope or passed as a
parameter in a method, its denoted as >dependency. However, for association,
I believe, the object needs to be on >global scope (as an instance variable)
. However, I rarely use any object >at a global scope, unless I know that it
is used for maintaining the state >of class or need to be used across
different methods. So most of the time, >I end up with dependency . > &gt
;Am I missing something over here. > >Thanks > >-ShriKant > >
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