public class TestJList extends JFrame {    public TestJList() {        JList list = new JList(new String[] { "cc", "zz", "pp" });        this.add(list);        list.setCellRenderer(new DefaultListCellRenderer() {            public void paintComponent(Graphics g) {                super.paintComponent(g);                g.setColor(Color.red);                g.drawLine(0, getHeight() - 1, getWidth(), getHeight() - 1);            }        });        this.setTitle("Test JList");        this.pack();        this.setVisible(true);    }    public static void main(String[] args) {        TestJList t = new TestJList();    }}