Java - Ayuda con DecimalFormat en Jtable

public class Renderdeci extends DefaultTableCellRenderer {

    private DecimalFormatSymbols simbolos;

    private DecimalFormat formateador;

    public Renderdeci() {

        simbolos = new DecimalFormatSymbols();

        simbolos.setDecimalSeparator('.');

        formateador = new DecimalFormat("###0.00", simbolos);

    }

    @Override

    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {

        return this;

    }

}