• Subject: Re: INSERT data in JTABLE
  • From: Raghavendra Rao <raghavendra_rao@xxxxxxxxx>
  • Date: Tue, 26 Dec 2000 06:47:15 -0800 (PST)

Hello All,
I found the answer in an another forum for the dyanmic
data addition in  a JTable, only I dont know who this
works !!!! heh, heh, help please.
alright, Here is what he says

>Anyway, I am assuming that u want to use the
>constructor JTable(Vector rowData, Vector
columnNames) >and that u need to show the DataObjects
properties as >the rowData for the table.You already
have the >columnName vector(great!). The rowData
vector
>actually is a vector of vectors. So you need to
>construct the same. The vector of DataObjects would
>not do the trick. What u need to do is to make a
>vector out of a the DataObject (how about a
>getDataVector()method in DataObject ?) and then add
it >to another Vector, and use this vector in the
>constructor.  The get DataVector method should return
a
>vector containing the 5 properties of the DataObject
>Adding a row to the table would be achieved by adding
>an element(vector of 5 properties in your case) to
the >rowData vector and calling the
fireTableDataChanged().
>Another thought in the same line would be to use
>DefaultTableModel to construct the table as it
>maintains the vector internally.  I hope u get
>the Idea. 
JTable jt = new JTable(vec, columnNames);  //vec is my
data Vector 
scrPayments.getViewport().add(jt);                    
 //scrPayments is
a scrollpane
        
for(int i = 0; i < vec.size(); i++){
        
jt.setValueAt(((Vector)vec.elementAt(i)).elementAt(0),
i, 0); 
        
jt.setValueAt(((Vector)vec.elementAt(i)).elementAt(1),
i, 1);
        
jt.setValueAt(((Vector)vec.elementAt(i)).elementAt(2),
i, 2);
        
jt.setValueAt(((Vector)vec.elementAt(i)).elementAt(3),
i, 3);
        
jt.setValueAt(((Vector)vec.elementAt(i)).elementAt(4),
i, 4);
}

Whats happening here,
Thanx again,
Rao
 
--- Raghavendra Rao <raghavendra_rao@yahoo.com> wrote:
> Hi James,
> Thanks, I didnt see why it shouldnt take a String
> for
> an Object, It accepted the string yesterday.
> Christmas
> . . . .does wonders, doesnt it !!!!.
> But, My JTable still gives a nullpointer exception,
> to
> whichever row I try to insert my data into.
> Should my JTable be initialised to some dummy values
> or should I specifiy the dimensions of my JTable
> before hand !!!!
> Thanks a lot and enjoy your holidays,
> Rao 
> --- "James H. H. Lampert" <jamesl@hb.quik.com>
> wrote:
> > Raghavendra Rao wrote:
> > . . .
> > > Yes, Thats right. I used a TableModel from the
> > > abstract table model. Thats where I have my
> > > setValueAt() method. Which I am trying to use.
> But
> > > this method accepts an Object which has the
> value
> > of
> > > the column where i want to insert. But my
> problem
> > is,
> > > how do we initialise this object with a string
> and
> > how
> > > do I use the method setValueAt().
> > . . .
> > 
> > Dear Raghavendra:
> > 
> > I think I'm on a bit more solid ground here (it's
> > been a while since I
> > coded anything involving a JTable).
> > 
> > When a parameter has a type of "Object," then it
> > will accept anything
> > that's a subclass of Object. Which is to say, it
> > will accept anything
> > other than a primitive. Strings are not
> primitives;
> > they are objects of
> > class "String." Thus, if a parameter accepts an
> > "Object," then it will
> > naturally accept a "String."
> > 
> > Of course, as scatterbrained as I am, I usually
> code
> > with the reference
> > book open on my desk (or in a browser or
> BookManager
> > window), regardless
> > of the language.   ;-)
> > 
> > -- 
> > James H. H. Lampert
> > Professional Dilettante
> > http://www.hb.quik.com/jamesl
> > Have you visited http://www.thehungersite.com
> today?
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