Código:
Y en cada JTable lo aplico de esta manera:public class RenderTabla extends JFormattedTextField implements TableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
this.setBorder(BorderFactory.createEmptyBorder());
if (value instanceof Double) {
Double valor = (Double) value;
this.setFormatterFactory(new DefaultFormatterFactory(new NumberFormatter(new DecimalFormat("##,##0.00"))));
this.setHorizontalAlignment(SwingConstants.RIGHT);
this.setValue(valor);
}
return this;
}
}
Código:
tbl_Resultados.setDefaultRenderer(Double.class, new RenderTabla());


