Display error when adding same item into JTable

Question

I using detaful table model

DefaultTableModel model = (DefaultTableModel) jTable1.getModel();

and I row count

int Row = model.getRowCount();

Here is which I add row and wish to diplay error when adding same items.

if (Row > 0) {

               for(i=0;i<Row; i++){
                   if(jTable1.getValueAt(i,0).equals(name.getText())){       
                    JOptionPane.showMessageDialog(null, "Can't add same item");
               }
               }
    }else if (Row <99) {
        model.addRow(new Object[] {name.getText(),address.getText(),Integer.parseInt(age.getText())});
    }

I guess wrong at if else statement? Because I can add the 1st row and I can't add for 2nd row.

Thanks for help

For better help sooner, post your code as an [SSCCE](http://www.sscce.org) that demonstrates your problem. This allows users to copy/paste and reproduce your issue. — Duncan Jones, Jul 18 '13 at 08:04

Niels Bech Nielsen · Answer 1 · 2013-07-18T08:28:16.273

0

Not sure what you have in your other variables, but I guess you have a discrepancy between product_id and name, perhaps?

Wouldn't it be more like

if(jTable1.getValueAt(i,0).equals(name.getText())){

UPDATE:

Try rewriting it like this:

int Row = model.getRowCount();
int boolean exists = false;
for(i=0;i<Row; i++){
   if(jTable1.getValueAt(i,0).equals(name.getText())){       
      JOptionPane.showMessageDialog(null, "Can't add same item");
      exists = true;
      break;
   }       
}


if (!exists && Row < 99) {
     model.addRow(new Object[] {name.getText(),address.getText(),Integer.parseInt(age.getText())});
}

edited Jul 18 '13 at 08:28

answered Jul 18 '13 at 08:06

Niels Bech Nielsen

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yeah..my bad..i post the wrong 1..that should be name.getText(), I've update alr. – Q123Q Jul 18 '13 at 08:10
Can you then tell me, what type is name.getText()? is it a String? – Niels Bech Nielsen Jul 18 '13 at 08:15
Note, that you don't go into the else block if there is an existing row. I assume it just doesn't add the row, not complaining? – Niels Bech Nielsen Jul 18 '13 at 08:21
Essentially, you would probably want to break your problem into two.. 1) Establish if name already exists, and set a boolean. 2) If if boolean is false and rowcount less than 99 then add.. – Niels Bech Nielsen Jul 18 '13 at 08:24
erm, after add the 1st row it doesn't add the 2nd row with different items. – Q123Q Jul 18 '13 at 08:24
yeah,it works ~ thank you and for the line : int boolean exists = false; should be change to right? – Q123Q Jul 18 '13 at 08:37
yeah..thanks for the explanation, I all combine in 1 and confuse that why can't add..thanks for the help anyway – Q123Q Jul 18 '13 at 08:47

Display error when adding same item into JTable

1 Answers1