hi~ all

one>
list.setModel(listModel);
list.updateUI();

two>
list.setModel(listModel);
//list.updateUI();

It makes a difference..

and I'm learning english and I'm not fluent in english..
but don't worry.. I'm great reading..^^

It makes a difference..
please tell me the reason..

thanks..

=================================================

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

public class DelegateEx extends JFrame implements ActionListener {

private JTextField tf = new JTextField();

private DelegateListModel listModel = new DelegateListModel();
private JList list = new JList();
private JScrollPane scroll = new JScrollPane(list);

public DelegateEx() {
super("UI-Model Ex");

JPanel cpPane = (JPanel)getContentPane();
cpPane.setLayout(new BorderLayout());
cpPane.add(tf, BorderLayout.NORTH);
cpPane.add(scroll, BorderLayout.CENTER);

tf.addActionListener(this);
}

public void actionPerformed(ActionEvent e) {
if (e.getSource() == tf) {
String str = tf.getText();
if (str.length() < 0) return;

listModel.addRow(str);

///////////////////////////////
list.setModel(listModel);
list.updateUI();

///////////////////////////////

tf.select(0, str.length());
}
}

public static void main(String args[]) {
DelegateEx frm = new DelegateEx();
frm.setVisible(true);
frm.pack();
}
}

class DelegateListModel extends AbstractListModel {

private Vector listData = new Vector();

public Vector getListData() {
return listData;
}
public void addRow(String sItem) {
if (sItem == null) return;
listData.addElement(sItem);
}

public int getSize() {
return listData.size();
}
public Object getElementAt(int index) {
return listData.get(index);
}
}