Sophia Dever

It's working!

After some more research, I realized I needed to import javax.swing.event.ListSelectionListener and javax.swing.event.ListSelectionEvent, and implement ListSelectionListener.

A final Thank You to everyone for their help--I hope to figure out some more about using Java forums over time.

But the original program didn't have a main method--it was a class used in another program.

Should I put in a main method anyway? Or is it possible that that was affecting/causing the error?

You're right about the subject line. Sorry, I always get the JScrollPane and the JList confused.

Here is the full test program:

import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.io.*; public class test { JFrame frame = new JFrame(); String[] races = {"elf", "orc", "hobbit", "Istar", "human"}; JList racelist = new JList(races); JScrollPane racesscroller = new JScrollPane(racelist); public void go() { racescroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR__ALWAYS); racescroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); racelist.setVisibleRowCount(4); racelist.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); racelist.addListSelectionListener(this); } }

Obviously in a full program this would include adding the list to the frame and displaying, but this is the relevant code.

All I want is to be informed when someone clicks on one of the options.

Thanks for bearing with me!

I'm trying to register to get events from a JList The JList itself works fine; after defining "racelist", I say:

racelist.addListSelectionListener(this);

When I compile, it gives me the following error:

test.java:18: addListSelectionListener(javax.swing.event.ListSelectionListener) in javax.swing.JList cannot be applied to (test)
racelist.addListSelectionListener(this);
1 error


So is that not the right way? It's what Head First Java says to do.

(Edited because of confusion between JList and JScrollPane.)