Hi Friend,

Try the following code:

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

public class AutoSuggest extends JPanel{
private final JTextField tf;
private final JComboBox combo = new JComboBox();
private final Vector<String> v = new Vector<String>();
public AutoSuggest() {
super(new BorderLayout());
combo.setEditable(true);
tf = (JTextField) combo.getEditor().getEditorComponent();
tf.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
EventQueue.invokeLater(new Runnable() {
public void run() {
String text = tf.getText();
if(text.length()==0) {
combo.hidePopup();
setModel(new DefaultComboBoxModel(v), "");
}else{
DefaultComboBoxModel m = getSuggestedModel(v, text);
if(m.getSize()==0 || hide_flag) {
combo.hidePopup();
hide_flag = false;
}else{
setModel(m, text);
combo.showPopup();
}
}
}
});
}
public void keyPressed(KeyEvent e) {
String text = tf.getText();
int code = e.getKeyCode();
if(code==KeyEvent.VK_ENTER) {
if(!v.contains(text)) {
v.addElement(text);
Collections.sort(v);
setModel(getSuggestedModel(v, text), text);
}
hide_flag = true;
}else if(code==KeyEvent.VK_ESCAPE) {
hide_flag = true;
}else if(code==KeyEvent.VK_RIGHT) {
for(int i=0;i<v.size();i++) {
String str = v.elementAt(i);
if(str.startsWith(text)) {
combo.setSelectedIndex(-1);
tf.setText(str);
return;
}
}
}
}
});

continue....

String[] countries = {"Afghanistan", "Albania", "Algeria", "Andorra", "Angola","Argentina","Armenia","Austria",
"Bahamas","Bahrain", "Bangladesh","Barbados", "Belarus","Belgium","Benin","Bhutan","Bolivia",
"Bosnia & Herzegovina","Botswana","Brazil","Bulgaria","Burkina Faso","Burma","Burundi",
"Cambodia","Cameroon","Canada", "China","Colombia","Comoros","Congo","Croatia","Cuba",
"Cyprus","Czech Republic","Denmark", "Georgia","Germany","Ghana","Great Britain","Greece","Hungary",
"Holland","India","Iran","Iraq","Italy","Somalia", "Spain", "Sri Lanka", "Sudan","Suriname", "Swaziland",
"Sweden","Switzerland", "Syria","Uganda","Ukraine","United Arab Emirates","United Kingdom",
"United States","Uruguay","Uzbekistan","Vanuatu","Venezuela","Vietnam","Yemen","Zaire","Zambia",
"Zimbabwe"};
for(int i=0;i<countries.length;i++){
v.addElement(countries[i]);
}
setModel(new DefaultComboBoxModel(v), "");
JPanel p = new JPanel(new BorderLayout());
p.setBorder(BorderFactory.createTitledBorder("AutoSuggestion Box"));
p.add(combo, BorderLayout.NORTH);
add(p);
setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
setPreferredSize(new Dimension(300, 150));
}
private boolean hide_flag = false;
private void setModel(DefaultComboBoxModel mdl, String str) {
combo.setModel(mdl);
combo.setSelectedIndex(-1);
tf.setText(str);
}
private static DefaultComboBoxModel getSuggestedModel(java.util.List<String> list, String text) {
DefaultComboBoxModel m = new DefaultComboBoxModel();
for(String s: list) {
if(s.startsWith(text)) m.addElement(s);
}
return m;
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new AutoSuggest());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}

Thanks