Hello,

i have a simple problem. Let's say that in some app, i have a loop wich
add a lot of elements to a JList. I CANNOT change the loop, but i can
change how each element is added.

What i would like is that i can scroll the JList with the mouse,
select/unselect, etc... WHILE the elements are added:
1/ Is it possible? (for knwoledge)
2/ Is it possible in a simple manner? (for developping it)
3/ How can that be done?

Here is what i've come to without any success:

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import java.awt.BorderLayout;

import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;

public class Refresh extends JFrame {

    private JPanel jContentPane = null;
    private JList jList = null;
    private JButton jButton = null;
    private JScrollPane jScrollPane = null;

    public Refresh() {
        super();
        initialize();
    }

    private void initialize() {
        this.setSize(300, 200);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setContentPane(getJContentPane());
    }

    private JPanel getJContentPane() {
        if (jContentPane == null) {
            jContentPane = new JPanel();
            jContentPane.setLayout(new BorderLayout());
            jContentPane.add(getJButton(), BorderLayout.NORTH);
            jContentPane.add(getJScrollPane(), BorderLayout.CENTER);
        }
        return jContentPane;
    }

    private JList getJList() {
        if (jList == null) {
            jList = new JList(new DefaultListModel());
        }
        return jList;
    }

    private JButton getJButton() {
        if (jButton == null) {
            jButton = new JButton();
            jButton.setText("Add");
            jButton.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent e) {

                    // this CANNOT be changed
                    for (int i = 0; i < 1000000; i++)
                        add2(i);
                }
            });
        }
        return jButton;
    }

    /**
    * Direct access.
    *
    * The JList "freezes" while new element are addded.
    */
    private void add1(int i) {
        ((DefaultListModel)getJList().getModel()).addElement(new Integer(i));
    }

    /**
    * invokeLater.
    *
    * The JList freezes too, and a java.lang.OutOfMemoryError is throwed;
    */
    private void add2(int i) {
        SwingUtilities.invokeLater(new RunAdd(i));
    }

    private final class RunAdd implements Runnable {
        private int i;
        public RunAdd(int i) {
            this.i = i;
        }
        public void run() {
            ((DefaultListModel)getJList().getModel()).addElement(new
Integer(i));
        }
    }

    private JScrollPane getJScrollPane() {
        if (jScrollPane == null) {
            jScrollPane = new JScrollPane();
            jScrollPane.setViewportView(getJList());
        }
        return jScrollPane;
    }

    public static void main(String[] args) {
        new Refresh().setVisible(true);
    }
}
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TIA for any help :)