Pls Help :JTable Double Value Editing Problem

Question

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 of JTable
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
Pls tell me what exactly do i need, a custom Cell Editor or Cell Renderer. and whether can i do it in the
Table Model Defination class or whether i can only do it on the Jtable only.
guys its so confusing.pls help
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

Answer 1

No.
But further to this try:
public class MyCustomRenderer  extends javax.swing.table.DefaultTableCellRenderer
          private java.text.DecimalFormat FORMAT_DOUBLE;
          public MyCustomRenderer()
                  FORMAT_DOUBLE = new java.text.DecimalFormat("#, ##0.00");
          public java.awt.Component getTableCellRendererComponent(javax.swing.JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
                    //NB! you could also set foreground/background here to indicate positive/negative values...
                    if(value.getClass().equals(Double.class))//is this a double?
                            double d = ((Double)value).doubleValue();
                            d = (Double.isNaN(d)||Double.isInfinity(d))?0:d;
                            this.setText(FORMAT_DOUBLE.format(d));
                    else//not a double so let's toString() it...
                           this.setText(""+value);
}then, using code pasted above, specify a new instance of this class as the default renderer in your
table.....
:)