hi friends

as i am new to swings and Jtable pls help me if u can.


in the code copied below when i start putting value into the Double column
a ( .0 ) is appended at the end which is undesirable it should be like that only when the value is
something like 22.99 and also i want to limit the double value's fractional part to be limited to 2 digits only.
if this can be done in my Table model itself so that it will work everywhere i use this model

it will be really great !!!!!

if anyone can send a sample code for achieving this it would be of great help

---

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.text.*;
 
public class TableProcessing extends JFrame implements TableModelListener
{
    JTable table;
 
    public TableProcessing()
    {
        String[] columnNames = {"Item", "Quantity", "Price", "Cost"};
        Object[][] data =
        {
            {"Bread", new Integer(1), new Double(1.11), new Double(1.11)},
            {"Milk", new Integer(1), new Double(2.22), new Double(2.22)},
            {"Tea", new Integer(1), new Double(3.33), new Double(3.33)},
            {"Cofee", new Integer(1), new Double(4.44), new Double(4.44)}
        };
 
        DefaultTableModel model = new DefaultTableModel(data, columnNames);
        model.addTableModelListener( this );
//
        table = new JTable( model )
        {
            //  Returning the Class of each column will allow different
            //  renderers to be used based on Class
            public Class getColumnClass(int column)
            {
                return getValueAt(0, column).getClass();
            }
 
            //  The Cost is not editable
            public boolean isCellEditable(int row, int column)
            {
                if (column == 3)
                    return false;
                else
                    return true;
            }
        };
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
//
        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );
    }
 
    /*
     *  The cost is recalculated whenever the quantity or price is changed
     */
    public void tableChanged(TableModelEvent e)
    {
        if (e.getType() == TableModelEvent.UPDATE)
        {
            int row = e.getFirstRow();
            int column = e.getColumn();
 
            if (column == 1 || column == 2)
            {
                int    quantity = ((Integer)table.getValueAt(row, 1)).intValue();
                double price = ((Double)table.getValueAt(row, 2)).doubleValue();
                Double value = new Double(quantity * price);
                table.setValueAt(value, row, 3);
            }
        }
    }
 
    public static void main(String[] args)
    {
        TableProcessing frame = new TableProcessing();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible(true);
    }
}

thank in advance
jags

 

 

Use a custom renderer that uses an apropriate instance of [url=http://java.sun.com/j2se/1.4.2/docs/api/java/text/NumberFormat.html]NumberFormat[/url] to produce the desired string representation of your doubles.
[url=http://java.sun.com/docs/books/tutorial/uiswing/components/table.html]Read this for more information on custom renderers.[/url]