求大神帮忙加一段自动过滤匹配的代码在里面，比如输入江西下拉框就只显示江西一、江西二、江西三。源码如下

[weixin_39184117]

package ouxiang;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
public class ShuiErZi extends JFrame implements ItemListener,
KeyListener
{
String s[] = { "江西一", "江西二", "江西三","有人不会","有人@我","有人在一起吧" };
JComboBox jb1 = new JComboBox(s);
JLabel jla = new JLabel("我不会");
JPanel panel = new JPanel();
String defaultMessage="";
Component cmp;
public ShuiErZi() {
jb1.setEditable(true);
panel.add(jb1);
panel.add(jla);
setSize(420, 200);
setLocationRelativeTo(null);
this.getContentPane().add(panel);
this.setBounds(100, 100, 300, 300);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
jb1.addItemListener(this);
cmp = jb1.getEditor().getEditorComponent();
cmp.addKeyListener(this);
}
public static void main(String[] args) {
new ShuiErZi();
}
public void itemStateChanged(ItemEvent e){
jla.setText(e.getItem().toString());
}
public void keyPressed(KeyEvent e)
{
}
public void keyReleased(KeyEvent e)
{
jla.setText(jb1.getEditor().getItem().toString());
repaint();
}
public void keyTyped(KeyEvent e)
{
}
}