How to scroll JList to bottom

Question

I have a JList on a JScrollPane, and it updates in real-time.
As the data fills the pane, I want it to scroll to the bottom all the time,
but it stays at the top. I update as follows:
String voltString[]=new String[someNumber];
// Set the strings to stuff--code omitted
voltList.setListData(voltStrings);
voltList.ensureIndexIsVisible(voltStrings.length);But it doesn't work. The API for ensureIndexIsVisible says something
about a JViewPort, but I am not sure what it means--I have it on a
JScrollPane, not a JViewPort.

Answer 1

works OK like this
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Testing extends JFrame
  int counter = 0;
  javax.swing.Timer timer;
  public Testing()
    setLocation(200,100);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    final DefaultListModel lm = new DefaultListModel();
    final JList list = new JList(lm);
    JScrollPane sp = new JScrollPane(list);
    sp.setPreferredSize(new Dimension(100,150));
    getContentPane().add(sp);
    pack();
    setVisible(true);
    ActionListener al = new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        lm.addElement(counter);
        counter++;
        list.ensureIndexIsVisible(lm.size()-1);
        if(counter > 100) timer.stop();}};
    timer = new javax.swing.Timer(100,al);
    timer.start();
  public static void main(String[] args){new Testing();}
}