Re: Vector of a vector?

That's what I was thinking of last night just before I went to bed.  Now 
that you've verified it, I think that's the way I'll do it.  Put a vector 
for the properties within the street class.  Thanks,

Ron Power
Programmer
Information Services
City Of St. John's, NL
P.O. Box 908
St. John's, NL
A1C 5M2
Tel: 709-576-8132
Email: rpower@xxxxxxxxxx
Website: http://www.stjohns.ca/
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"Joe Sam Shirah" <jshirah@xxxxxxxxxxxxx> 
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28/03/2005 05:02 PM
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Re: Vector of a vector?







    Hi Ron,

    As Franco indicated, you can put any Object in a Vector, and get the
effect of Vectors of Vectors of...  But this statement is a little 
confusing
to me:

> I have a Property object that I'd like to put in a vProp vector that
> is located in an index of the vStreet vector?

    I often use what I call corresponding arrays - for a quick and 
probably
bad example, arrays of client id and client name, where each element 
refers
to the same client.  You could do a similar thing with Vectors.  One issue
though, is that when items are removed from a collection, including 
Vectors,
the index changes, so you have to be careful that all associated vectors 
are
in synch.

    I don't know your app, so this make not make sense in context, but an
approach I'd prefer would be to have a subclass of Street ( or add to the
existing class ) in which each instance contains a reference to the
appropriate Property Vector.  Then you don't have to worry further about
correspondence.

    In later versions of the JVM, synchronization in Vectors is not such a
big deal, but, unless synchronization is required, it's curious at this
stage why anyone would not prefer a newer collection.


                                                         Joe Sam

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----- Original Message ----- 
From: <RPower@xxxxxxxxxx>
To: "Java Programming on and around the iSeries / AS400"
<java400-l@xxxxxxxxxxxx>
Sent: Monday, March 28, 2005 2:30 PM
Subject: Vector of a vector?


> Can I do a 2 dim vector?
>
> What I have is a list of streets, and for each street there is a list of
> propertys.  I have a street object that I'm putting in a vStreet vector
> now.  I have a Property object that I'd like to put in a vProp vector 
that
> is located in an index of the vStreet vector?  Any ideas?  I know
> ArrayList is better, but I was told to use a Vector :(
>
> Ron Power
> Programmer
> Information Services
> City Of St. John's, NL
> P.O. Box 908
> St. John's, NL
> A1C 5M2
> Tel: 709-576-8132
> Email: rpower@xxxxxxxxxx
> Website: http://www.stjohns.ca/
>

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