Trigger for redrawing the nth line in the JList

May I know, know that I can start the system to redraw the nth line in the JList? Currently I have done

jList0.repaint();    // Repaint entire JList, which is not efficient.

      

        
        
        
      

    

I'm only interested in updating the nth line in the JList.

Note that the reason I want to do this is because I am setting up a custom list renderer. The look of the list GUI will depend on the external model phase of my application.

public ListCellRenderer getListCellRenderer() {
    return new DefaultListCellRenderer() {

        @Override
        public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
            Component component = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
            if (component != null && value != null) {
                final MainFrame mainFrame = MainFrame.getInstance();
                final String portfolioName = mainFrame.getJStockOptions().getPortfolioName();

                if (value.toString().equals(portfolioName)) {
                    component.setFont(new Font(component.getFont().getName(), Font.BOLD, component.getFont().getSize()));
                }
            }
            return component;
        }
    };
}