Association vs Dependency (Offbeat)

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Association vs Dependency (Offbeat)

Association vs Dependency (Offbeat)

2003-12-30 - By ShriKant Vashishtha

Back

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

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.<?xml:namespace prefix = o ns =
"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) > 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
>dependency. > > >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 manifest 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: >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 . > >Am I missing something over here. >
>Thanks & gt; > >-ShriKant > > >-- ---- --- -- ---- ---- ---- ---- >Do you
Yahoo!? > > >Protect your identity with Yahoo! Mail AddressGuard > > >
>===================================================================== > >
>Companion Site: http://www.corej2eepatterns.com >J2EE BluePrints: http://java
.sun.com/blueprints/corej2eepatterns >List Archive: http://archives. java.sun
.com/archives/j2eepatterns-interest.html >Unsubscribing: email
>"signoff J2EEPATTERNS-INTEREST" to >listserv@(protected) > >MSN 8 helps
>ELIMINATE E-MAIL VIRUSES. Get 2 months FREE*. >
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/archives/j2eepatterns-interest.html Unsubscribing: email "signoff J2EEPATTERNS
-INTEREST" to >
>listserv@(protected) & gt; > >
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.sun.com/blueprints/corej2eepatterns >List Archive: http://archives.java.sun.com
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-INTEREST" to
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-INTEREST" to
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 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
 
 
 
<table width=100%>
<tr valign=top>
<td>
<td>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
 
<td>        
         To:   &nbsp
;    J2EEPATTERNS-INTEREST@(protected)
         cc:   &nbsp
;    
         Subject:  
     Re: Association vs Dependency (Offbeat)</table>
 
 
 Hi  ShriKant;
 When you have an abstract class and its
concret implementation class,  it is some sort of dependency.<?xml
:namespace prefix = o ns = "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, > &gt
;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 > > &gt
; > >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) > cc: > Subject: Re: Association vs
Dependency (Offbeat) > > >ShriKant; >Dependency relates th!
e model elements themselves and does not require a >set of instances for
its meaning."urn:schemas-microsoft-com:office:office" /> > &gt
;Dependency indicates a situation in which a change to the supplier may &gt
;require a change to or indicate a change in meaning of the client in the &gt
;dependency. > > >1- has a reference to an object directly. &gt
;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 &gt
;generalization fit within the general definition of depen!
dency, but they >have their own model representation and notation a
nd 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 &gt
;bidirectional association. >But could you please elaborate the following &gt
;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 &gt
;illustrate the difference between them >and give an example. > /> >
>Dependency : >Anytime a class uses another class in some fashion, a &gt
;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 &gt
;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 c
lass. >In java, this manifest itself as an instance >variables on the
class that >may invoke methods. > >Example: >Public class &gt
;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; &gt
;Public class Team > { > LinkedList teamPlayers = new >LikedList(); &gt
; 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: >Association vs Dependency !
>(Offbeat) >Date: Sun, 28 Dec 2003 14:17:03 -0800 > > >Hi All,
> >I am >slightly confused in finding the difference between &gt
;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!? > > &gt
;Protect your identity with Yahoo! Mail AddressGuard > > > >========
===========================================================!
== > > >Companion Site: http://www.corej2eepatterns.com >J
2EE BluePrints: http://java.sun.com/blueprints/corej2eepatterns >List
Archive: http://archives. java.sun.com/archives/j2eepatterns-interest.html &gt
;Unsubscribing: email >"signoff J2EEPATTERNS-INTEREST" to &gt
;listserv@(protected) > >MSN 8 helps >ELIMINATE E-MAIL VIRUSES. Get 2
months FREE*. > >========================================================
============ > >Companion Site: http://www.corej2eepatterns.com J2EE
BluePrints: http://java.sun.com/blueprints/corej2eepatterns List Archive: http:
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============ > >Companion Site: http://www.corej2eepatterns.com >J2EE
BluePrints: http://java.sun.com/blueprints/corej2eepatterns >List Archive:
http://archives.java.sun.com/archives/j2eepatterns-intere!
st.html >Unsubscribing: email "signoff J2EEPATTERNS-INTEREST" to
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months FREE*. >=============================================================
======= >Companion Site: http://www.corej2eepatterns.com J2EE BluePrints:
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