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Association Problem

2 replies on 1 page. Most recent reply: Jun 5, 2005 12:28 AM by Shashank D. Jha

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Kondwani Mkandawire

Posts: 530
Nickname: spike
Registered: Aug, 2004

Association Problem

Posted: Jun 2, 2005 6:49 AM

If I have a class as follows:


classA{
	int att1;
	
	public boolean someMethod1(packageb.ClassB b){
		process(b);
		return false;
	}
}

Is it fair to say A is associate with B, if B were an attribute, then
we would say A has to have a B object, am I right??

Thanks for your assistance.

Spike

Amol Brid

Posts: 43
Nickname: amolbrid
Registered: Feb, 2004

Re: Association Problem

Posted: Jun 3, 2005 5:17 AM

Yes you are right, there is a association between A and B.

If B is a member of A then there can be two types of associations:
1) Aggregation, lifetime of B is not controlled by A, and
2) Composition, lifetime of B is controlled by A, means A is responsible for creating and Destroying B's object.

Second point was not clear to me.

Regards,
Amol Brid.

Shashank D. Jha

Posts: 68
Nickname: shashankd
Registered: May, 2004

Re: Association Problem

Posted: Jun 5, 2005 12:28 AM

responding to Kondwani

> If I have a class as follows:
>
>


> classA{
> 	int att1;
> 	
> 	public boolean someMethod1(packageb.ClassB b){
> 		process(b);
> 		return false;
> 	}
> }
>

>
> Is it fair to say A is associate with B, if B were an
> attribute, then
> we would say A has to have a B object, am I right??

Case 1:
Whenever two objects communicate with each other they are associated. So that way you are correct that A and B are associated.

Case 2:
You are further correct that when A has object of B as one of its attribute.

Case 1 kind of association, as reflected in your source code is basically termed as "dependency" relationship in UML.

Case 2: kind of relation as mentioned theoretically is basicaly called as Associaiton relation in UML.

regards,

------------
Shashank D. Jha
iCMG
e-mail : shashank@icmgworld.com
Phone : +91-80-98451 87302

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