JList error

Hi all.

Getting there slowly but miffied about this:

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

public class TextArea1 implements ActionListener{
	JTextArea text;
	JCheckBox check = new JCheckBox("check?");
	boolean checked;
	JList list;

public static void main (String args[]) {

TextArea1 gui = new TextArea1();
		gui.go();
	}
	public void go(){

JFrame frame = new JFrame();
		JPanel panel = new JPanel();
		JButton button = new JButton("Just click it");
		button.addActionListener(this);
		 text = new JTextArea(10,20);
		text.setLineWrap(true);

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

panel.add(scroller);

check.setSelected(true);
		check.addActionListener(new CheckBoxClick());
		frame.getContentPane().add(BorderLayout.NORTH, check);

String[] listEntries = {"alpha", "beta", "gamma", "delta", "episilon", "zeta", "eta", "theta" };
		list = new JList(listEntries);
		list.setVisibleRowCount(4);
		list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		list.addListSelectionListener(new ListBoxClick());

JScrollPane scroller1 = new JScrollPane(list);
		scroller1.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		scroller1.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

frame.getContentPane().add(BorderLayout.WEST, list);
		frame.getContentPane().add(BorderLayout.CENTER, panel);
		frame.getContentPane().add(BorderLayout.SOUTH, button);

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

public void actionPerformed(ActionEvent ev) {
		text.append("Button clicked \n");
	}

class CheckBoxClick implements ActionListener {
		public void actionPerformed(ActionEvent ev) {
			if (check.isSelected()) {
				checked = true;
		} else {
			checked = false;
		}

text.append("Checkbox " + checked +"\n");
		}
	}

class ListBoxClick implements ActionListener {
		public void valueChanged(ListSelectionEvent lse) {
}
}
}

C:\Users\rob\Documents\TextArea1.java:72: cannot find symbol
symbol : class ListSelectionEvent
location: class TextArea1.ListBoxClick
public void valueChanged(ListSelectionEvent lse) {
^
C:\Users\rob\Documents\TextArea1.java:40: addListSelectionListener(javax.swing.event.ListSelectionListener) in javax.swing.JList cannot be applied to (TextArea1.ListBoxClick)
list.addListSelectionListener(new ListBoxClick());
^
C:\Users\rob\Documents\TextArea1.java:71: TextArea1.ListBoxClick is not abstract and does not override abstract method actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListener
class ListBoxClick implements ActionListener {
^
3 errors

Tool completed with exit code 1

Thanks in advance.

Rob.

I'm not 100% sure, but I think when you do

import javax.swing.*;

you only get the first level below "javax.swing"

However, the ListSelectionEvent is two levels below:

javax.swing.event.ListSelectionEvent

So I would either explicitly import that, or import this:

import javax.swing.event.*;

note: I have not tried this, it's a somewhat educated guess.

Tried what you suggested fred but still get the same error.

Rob Brew wrote:Tried what you suggested fred but still get the same error.

It must be another error. Could you post the error again, when you try to import everything?

Sure.

C:\Users\Rob\Documents\TextArea1.java:41: addListSelectionListener(javax.swing.event.ListSelectionListener) in javax.swing.JList cannot be applied to (TextArea1.ListBoxClick)
list.addListSelectionListener(new ListBoxClick());
^
C:\Users\Rob\Documents\TextArea1.java:72: TextArea1.ListBoxClick is not abstract and does not override abstract method actionPerformed(java.awt.event.ActionEvent) in java.awt.event.ActionListener
class ListBoxClick implements ActionListener {
^
2 errors

Tool completed with exit code 1

So how is going from 3 errors to 2 errors the same thing?

Sorry Fred, will repost the code.

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