Default background color and Focuslistener disapair on table?

Question

When I imp. TableCellRenderer on my table the default background color and Focuslistener disapair. What can I do to get it back and still keep TableCellRenderer on my table? This is how my TableCellRenderer looks:
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int col) {
        JFormattedTextField beloeb = new JFormattedTextField();
        beloeb.setFormatterFactory(new DefaultFormatterFactory(new NumberFormatter()));
        beloeb.setBorder(null);
        beloeb.setHorizontalAlignment(JTextField.RIGHT);
        if (value != null) {
            if (value instanceof Double) {
                Double val = (Double) value;
                beloeb.setValue(val);
                if (val.doubleValue() < 0) {
                    beloeb.setForeground(Color.RED);
        beloeb.setFont(new Font("Verdana",Font.PLAIN, 11));
        beloeb.setOpaque(true);
        return beloeb;
    }

Answer 1

I'm sorry to say this is a terrible example of a renderer. The point of using a renderer is to reuse the same object over and over. You don't keep creating Objects every time a cell is renderered. In your example your are creating:
a) JFormattedTextField
b) NumberFormatter
c) DefaultFormatterFactory
d) Font.
So you start by extending the DefaultTableCellRenderer. A JLabel is used to display the text. There is no need to use a JFormattedTextField. All you want to do is format the data. So in your constructor for the class you would create a NumberFormatter that can be reused to format your data. Then your code in the renderer would look something like:
if (value instanceof Double)
    Double val = (Double)value;
    setText( formatter.format(val) );
    if (negative)
      setForeground(Color.RED)
    else
        setForeground(table.getForeground());
}Here is a really simple [url http://forum.java.sun.com/thread.jsp?forum=57&thread=419688]example to get you started