Event handling error problem

Question

The purpose of following code is to display a list of all destinations to which flights are available on a perticular date selected by a user.On the execution of the Applet, a list of dates should be displayed in the list box and an empty destination combo box should be displayed..As soon as the user selects the date of travel and tabs out of the list box,the flights available on that perticular date should be updated in the combo box.
I have tried this program.But it shows compile time error.
Please help me to solve this problem.
error is as follows:
airline.java:29:cannot resolve symbol
symbol: method addItemListener (airline)
location: class javax.swing.JList
ldate.addItemListener(this);
^
1 error
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class airline extends JApplet implements ItemListener,ActionListener
     JPanel panel;
     JList ldate;
     JComboBox cmbdest;
     JButton b1;
     public void init()
          panel=new JPanel();
          getContentPane().add(panel);
          String date1[]={"12/21/2001","01/12/2003","03/04/2000"};
          ldate=new JList(date1);
     String dest[]={"New york","Germany","china","tibet","africa"};
          cmbdest=new JComboBox(dest);
          b1=new JButton("submit");
          panel.add(ldate);
          panel.add(cmbdest);
          panel.add(b1);
          ldate.addItemListener(this);     
          b1.addActionListener(this);
     public void itemStateChanged(ItemEvent e)
          JList ldate1=(JList)e.getItem();
          int state=e.getStateChange();
          if(state==ItemEvent.SELECTED)
          String str=String.valueOf(ldate1.getSelectedValue());
          if(str=="12/21/2001")
                    cmbdest.removeAllItems();
                    cmbdest.addItem("Germany");
                    cmbdest.addItem("china");
                    cmbdest.addItem("tibet");
                    return;
          else
               if(str=="01/12/2003")
               cmbdest.removeAllItems();
               cmbdest.addItem("tibet");
               cmbdest.addItem("New york");
               cmbdest.addItem("Africa");
               return;
               else
               if(str=="03/04/2000")
               cmbdest.removeAllItems();
               cmbdest.addItem("new york");
               cmbdest.addItem("china");
               cmbdest.addItem("Africa");
               return;
     public void actionPerformed(ActionEvent evt)
          JButton source=(JButton)evt.getSource();
          source.setText("clicked");
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Answer 1

A quick look in the JList API (http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/JList.html) will tell you that JList does not have a method called addItemListener. The following tutorial describes how to use JLists, including how to handle selections in the list:
"How to Use Lists":
http://java.sun.com/docs/books/tutorial/uiswing/components/list.html