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| | | Association vs Dependency (Offbeat) | Association vs Dependency (Offbeat) 2003-12-30 - By ashraf galal
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<html><div style='background-color:'><P>ShriKant;</P>
<P>you can consult the IBM Rational XDE product for parameterized patterns. </P>
<P>please read my notes regarding the similarity between generaslization and
dependency. </P>
<P> <BR></P><BR><BR><BR>
<DIV>Ashraf Galal <BR>(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 18:40:03 -0600 > >Hi Ashraf, > >
;As far as I know, the conecept of parameterised classes is available in >C++
as templates. As far as I know, Java does not have the concept of >
;parameterized classes. Please refer to >http://caml.inria.fr/oreilly-book
/html/book-ora203.html > >As far as relationship between abstract class
and concrete classes is >concerned, I think the relationship is
generalization still, not >dependency. > >-ShriKant > > > >
; >ashraf galal <ASHRAFWG@(protected)>>Sent by: An interest list for Sun
Java Center J2EE Pattern Catalog ><J2EEPATTERNS-INTEREST@(protected)> >
;12
/30/2003 02:29 PM >Please respond to An interest list for Sun Java Center
J2EE Pattern >Catalog > > > To: J2EEPATTERNS-INTEREST@(protected)
> cc: > Subject: Re: Association vs Dependency (Offbeat) > > >Hi
ShriKant; >When you have an abstract class and its concret implementation
class, it >is some sort of dependency."urn:schemas-microsoft-com:office
:office" /> > >I am not meant template deign pattern neither C++
templates, I mean >parameterized class, even the concept applies to any
design pattern in >J2EE or any other languages. > > > > > >
; >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: Re: >Association vs
Dependency (Offbeat) >Date: Tue, 30 Dec 2003 14:05:42 -0600 > > >Hi
Ashraf, > >I am sorry if I understood you correctly. >What
do you >mean by abstraction in this context and its relation with >
;dependency. >When you talk about template, are you talking about template
>method >design pattern or C++ templates? > >Please clarify. >
>Thanks >-ShriKant > > > > > >ashraf galal >Sent by:
An interest list for Sun Java Center J2EE >Pattern Catalog > >12/30
/2003 01:46 PM >Please respond to An interest list >for Sun Java Center
J2EE Pattern >Catalog > > > To: J2EEPATTERNS-INTERE >ST@(protected)
.COM > cc: > Subject: Re: Association vs Dependency (Offbeat) > >
> >ShriKant; >Dependency relates the model elements themselves and does
>not require a >set of instances for its >meaning."urn:schemas
-microsoft-com:office:office" /> > >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 > >depende
ncy. > > >1- has a reference to an object directly. >InstanceOf
>and abstraction are example of this type. >2- has a reference to an
object >indirectly via some operation >parameters: >A template class
is an example >of this type. >You can not use a template directly, you
have to >instantiate it first. >Instantiation involves binding these
formal >template parameters to actual >ones. >The result is a concrete
class hat >can be used as any ordinary one. > Dependency between packages
is another >example. > > >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). >
>So we need to make explicit >relationship between UML and J2EE. > >
> > > >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: Re: >Association vs Dependency (Offbeat) >Date: Tue, 30 Dec
2003 >09:01:54 -0600 > > >Hi Ashraf, > >I am quite clear
regarding >unidirectional and >bidirectional association. >But could
you please >elaborate the following >points more, may be with some >
;examples. > >- has >a reference to an object >directly. >- Has a
reference to an object >indirectly via some operation > >parameters.
> >Th anks >-ShriKant > > > > > >ashraf galal >
;Sent by: An >interest list for Sun Java Center J2EE Pattern >Catalog >
>12/29/2003 11:22 >PM >Please respond to An interest list for >Sun
Java Center J2EE Pattern > >Catalog > ; > > 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. > /> > >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 >depend ency
between >packages. > >Association: >There is two types of >
;association, >unidirectional and bi-directional >associations. > >
;Unidirectional >association implies that an object of the class may invoke
> >methods on >the other class. >In java, this manif
est itself as an instance >variables >on the class that >may invoke
methods. > >Example: >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 > { > LinkedList teamPlayers = new > >LikedList(); >
teamPlayers.add(new teamPlayer(?)); > ??? } > > public > >class
teamPlayer { > Team memberOf; > ?. > } & gt; >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: >Asso
ciation 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 . > >Am I missing something over
here. > > >Thanks & gt; > >-ShriKant > > >-- ------
-- -- ---- ---- ---- ---- >Do you >Yahoo!? > > >Protect your
identity with Yahoo! Mail AddressGuard > > &
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