Re: Help with DefaultListModel

From:

"Remi Arntzen" <Remi.Arntzen@gmail.com>

Newsgroups:

comp.lang.java.help

Date:

5 Oct 2006 12:43:24 -0700

Message-ID:

<1160077404.001399.15010@c28g2000cwb.googlegroups.com>

hiwa wrote:

Pat010 wrote:

Hello there,

I was wondering if someone can help me. I am quite new to Java so
apologies for my lack of knowledge.

I have created a JList list with a listModel and I am using the
addElement() method to add a string to the JList.

private JList list;
private DefaultListModel listModel;
listModel = new DefaultListModel();
list = new JList(listModel);
listModel.addElement( aString );

So for instance if I press a JButton with JAVA written on it the string
'JAVA' appears on the JList.

I have also used several JButton to create a QWERTY keyboard. I want to
use the keyboard buttons on my application to write JAVA (or any word)
on the JList.

For example when I press the JButton, J the letter 'J' appears on
screen:

J

when I press the JButton, A the letter 'A' appears on screen in the
same position in the list next to where the letter J is:

JA

and so on.

There are three methods in the DefaultListModel class that adds an
element to a JList:

add()
addElement()
insertelementAt()

None of these seems to let me do what I want. Do i need to create a
method like the append() method in the JTextArea class?

Would it be easier to replace the string 'J' with the string 'JA' in
the list at a specified index?
Any suggestions?

By the way is it possible to view the code of methods in the API using
JBuilder ( I have version 1.3)?

Thanks

You can't do that directly onto JList or its model.
If your current code is:
listModel.addElement(userString);
then, repeatedly update the userString after each key press and
call listModel.setElementAt(index, userString);

It works for me
//GUIExam.java
import javax.swing.*;
public class GUIExam {
    public static void main(String[] args) {
        JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame f = new JFrame("GUI TEST");
        DefaultListModel listModel = new DefaultListModel();
        JList list = new JList(listModel);
        f.getContentPane().add(list);
        f.setSize(200, 324);
        f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        f.setVisible(true);
        try {
            for (int i = 0; i < 15; i++) {
                listModel.addElement(i);
                Thread.sleep(1000);
            }
        } catch (InterruptedException thrown) {
            //meh
            thrown.printStackTrace();
        }
        f.setVisible(false);
        f.dispose();
    }
}