What listener to implement for JList?

[Bud Tippins]

I have the following code in NetBeans. On line #7 I'm getting the following error: "cannot find symbol - symbol: class ListSelectionListener" - question: what Listener should I have ListTest implement for a JList?

Thank you.

package listtest;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class ListTest implements ListSelectionListener {
    String [] listEntries = {"alpha", "beta", "gamma", "delta", "epsilon", "zeta", "eta", "theta",};
    JList list = new JList(listEntries);
    public static void main(String[] args) {
        ListTest lstTest = new ListTest();
        lstTest.go();

    }

    public void go() {
        JFrame frame = new JFrame();
        JPanel panel = new JPanel();

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JScrollPane scroller = new JScrollPane(list);
        scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

        panel.add(scroller);

        list.setVisibleRowCount(4);

        list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);


        list.addListSelectionListener(this);

        frame.getContentPane().add(BorderLayout.CENTER, panel);
        frame.getContentPane().add(BorderLayout.NORTH, list);

        frame.setSize(350, 300);
        frame.setVisible(true);
    }

   public void valueChanged(ListSelectionEvent lse) {
       if (!lse.getValueIsAdjusting()) {
           String selection = (String) list.getSelectedValue();
           System.out.println(selection);
       }
    }
}

[Mohamed Sanaulla]

ListSelectionListener is part of javax.swing.event package which you haven't imported in your Java code.

[Bud Tippins]

Thank you. That worked.