Adding new row of data to a jTable with a Button Click

Question

I am trying to add data read in from a form into a jTable. So far this is what I have and Im not sure why it will not work. This is the code:

    public void fillTable(){
        String inputField1 = jTextArea1.getText();
        String inputField2 = jTextField8.getText();
        String inputField3 = jComboBox1.getSelectedItem().toString();
        String inputField4 = jTextField11.getText(); 
        DefaultTableModel model = (DefaultTableModel) jTable2.getModel();
        int numRows = jTable2.getRowCount();
        for (int i = 0; i <= numRows; i++){
            model.setValueAt(inputField1, numRows, 1);
            model.setValueAt(inputField2, numRows, 2);
            model.setValueAt(inputField3, numRows, 4);
            model.setValueAt(inputField4, numRows, 6);      
        }
        jTable2.setModel(model);     
    }

The error I get is:

Exception in thread "AWT-EventQueue=0" java.lang.ClassCastException:  my.rcs.accounting.DraftInvoice$5 cannot be cast to groovy.model.DefaultTableModel

What am I doing wrong and how can I fix this?

Thank you!

Where does the exception being thrown ? Also, it look weird that you are looping over each row of the table but only setting the row at numRows (which will throw an exception BTW). — ortis
– ortis, Commented Nov 24, 2014 at 10:39
What do you mean by where is the exception being thrown? This method is called when a button is clicked. I still get the same exception even if I don't use the for loop. — BEE
– BEE, Commented Nov 24, 2014 at 10:44
I mean, which line on your code. My guess is that jTable2.getModel return a my.rcs.accounting.DraftInvoice and not a groovy.model.DefaultTableModel which result in an exception when you try to cast DefaultTableModel model = (DefaultTableModel) jTable2.getModel();. You should try to use DraftInvoice model = (DraftInvoice ) jTable2.getModel(). — ortis
– ortis, Commented Nov 24, 2014 at 10:54

inon · Accepted Answer · 2017-07-31 07:56:49Z

2

It's should be i instead of numRows.

for (int i = 0; i <= numRows; i++) {
      model.setValueAt(inputField1, i, 1);
      model.setValueAt(inputField2, i, 2);
      model.setValueAt(inputField3, i, 4);
      model.setValueAt(inputField4, i, 6);      
}

edited Jul 31, 2017 at 7:56

inon

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answered Nov 24, 2014 at 10:55

divelner

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Comments

Pelit Mamani · Accepted Answer · 2014-11-24 10:54:42Z

1

Could you locate the code that creates your jTable2? And also the exact import (=package name) you use for DefaultTableModel ?

I suspect the ClassCastException could come from this line: DefaultTableModel model = (DefaultTableModel) jTable2.getModel();

which begs two questions:

1) what table model was initially associated with jTable2, it seems to be some inner class my.rcs.accounting.DraftInvoice$5 and the question is - does it inherit from DefaultTableModel

2) What DefaultTableModel are you expecting, naiively I'd expect it to be javax.swing.table.DefaultTableModel

answered Nov 24, 2014 at 10:54

Pelit Mamani

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3 Comments

BEE Over a year ago

jTable2.setModel(new javax.swing.table.DefaultTableModel( new Object [][] { }, new String [] { "Description", "Date", "Qty", "Rate", "VAT", "Total" } )

BEE Over a year ago

^^That is the model used when creating the jTable. This is the import code: import groovy.model.DefaultTableModel;

Pelit Mamani Over a year ago

So you should import " javax.swing.table.DefaultTableModel", not that groovy stuff...

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