JTable Cell Editor For Decimal Input

Question

Hi friends in my program i am using jtable, in that table two columns are decimal value. I am using defaultcelleditor for to check the user input but it does not work. so how can i check the user input, ie number or string using the cell editor. My aim is to check the user input, if the user give the wrong value, ie string input the warning message want to be displayed and the editor color also want to change. Please help me.
I refer some tutorials and get some source code and i used but it does not work. this is the code.
DecimalFormat format=new DecimalFormat("######0.00");
tableField=new JFormattedTextField();
tab_Bill.getColumnModel().getColumn(3).setCellRenderer(new DecimalRenderer(format)); tab_Bill.getColumnModel().getColumn(3).setCellEditor(new ProblemEditor(tableField));
class DecimalRenderer extends DefaultTableCellRenderer {
  DecimalFormat formatter;
  DecimalRenderer(String pattern) {
    this(new DecimalFormat(pattern));
  DecimalRenderer(DecimalFormat formatter) {
    this.formatter = formatter;
    setHorizontalAlignment(JLabel.RIGHT);
    @Override
  public void setValue(Object value) {
   /* setText((value == null) ? "" : formatter.format(((Double) value)
        .doubleValue()));*/
setText((value == null) ? "" : formatter.format(Double.parseDouble(value.toString())));      
     class ProblemEditor extends DefaultCellEditor implements TableCellEditor{
   private JFormattedTextField ftf;
   public ProblemEditor(JFormattedTextField myfield) {
       super(myfield);
        @Override
   public Component getTableCellEditorComponent(JTable table,
           Object value, boolean isSelected, int row, int column) {
       ftf = (JFormattedTextField) super.getTableCellEditorComponent(table, value, isSelected, row, column);
        Double d = null;
       try
                if(value!=null)
        d=Double.parseDouble(value.toString());   
        catch(Exception e)
           // JOptionPane.showMessageDialog(null,"Wrong");
           d=0.0;
       ftf.setValue(d); // remove and okay
       ftf.setCaretPosition(ftf.getText().length());
       return ftf;
}

Answer 1

You might find it easer to use on of the [Table Format Renderers|http://www.camick.com/java/blog.html?name=table-format-renderers].