• Subject: Re: Copying objects
  • From: Eric Merritt <cyberlync@xxxxxxxxx>
  • Date: Mon, 18 Dec 2000 06:27:44 -0800 (PST)

I think the problem may be that the clone() method is
a shallow clone, meaning that it copies the object,
but any objects within the main object are not copied
only references are passed. To get passed this the sun
java site suggests implementing your own version of
the clone() method. I have not done this yet so I
cannot offer any suggestions unfortunately.

--- Graeme English <graeme.english@halna.com> wrote:
> 
> I have never had to tackle the referencing problem
> until now.  I am trying to modify a vector object
> that I get from a GUI pane that has multiple columns
> and rows for data entry.  When I manipulate the my
> copy of the vector it modifies the panes vector as
> well.  I have found a different way to do it and
> avoid the whole clone thing but I am still curious
> on why it wasn't working.
> 
> Here is my code:
> 1    Vector vector = (Vector)
> getTableModel().getDataVector().clone();
> 2    ... some modifications to vector ....
> 3    System.out.println(vector);
> 4   
> System.out.println(getTableModel().getDataVector());
> 
> Both 3 and 4 gave the same output.
> It was the same result as if I did it like this: 
> 1    Vector vector =
> getTableModel().getDataVector();
> 2    ... some modifications to vector ....
> 3    System.out.println(vector);
> 4   
> System.out.println(getTableModel().getDataVector());
> 
> Is there something special about vectors or do I
> just have the concepts mixed up?
> 
> Thanks in advance,
> Graeme.
> 
> 
> 
> 

=====
Eric Merritt
Information Systems Consultant
McCormack & Associates, Inc.
Rock Hill, South Carolina
(V) 803-327-3358 X 225
eric@mccinc.com
http://www.mccinc.com/

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