Cannot Resolve WindowListener Errors

Question

I do not understand where to change code to resolve errors. Can anyone help?
Thanks
FrontEnd.java:108: cannot resolve symbol
symbol : variable myWindowListener
location: class FrontEnd
     myWindowListener = new MyWindowListener();
^
FrontEnd.java:109: cannot resolve symbol
symbol : variable myWindowListener
location: class FrontEnd
     addWindowListener(myWindowListener);
^
2 errors
import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.Window.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.*;
import java.net.*;
public class FrontEnd extends Applet{
MyWindowListener myWindowLIstener;
     private static int appType = 0;
     private Frame FrontEnd = null;
     private Choice nameList = new Choice();
     private Label ItemID = new Label("");
     private TextField itemName = new TextField();
     private TextField itemProp1 = new TextField();
     private TextField itemProp2 = new TextField();
     private TextField itemProp3 = new TextField();
     private Button update = new Button("Update");
     private Button clear = new Button("Clear");
     private Button delete = new Button("Delete");
     private Button exit = new Button("Exit");
     private long idList[] = null;
     public static void main(String args[]){
     appType = 1;
     new FrontEnd();
     public FrontEnd(){
     Panel p = new Panel(new GridLayout(6,3));
     p.add(new Label());
     p.add(nameList);
     p.add(new Label());
     p.add(new Label("ItemId"));
     p.add(new Label());
     p.add(new Label());
     p.add(new Label("Item Name"));
     p.add(nameList);
     p.add(update);
     p.add(new Label("property 1"));
     p.add(itemProp1);
     p.add(clear);
     p.add(new Label("property 2"));
     p.add(itemProp2);
     p.add(delete);
     p.add(new Label("property 3"));
     p.add(itemProp3);
     p.add(exit);
     try{
     Socket s = null;
     BufferedReader reader = null;
     BufferedWriter writer = null;
     s = new Socket("66.24.174.32",1234);
     reader = new BufferedReader(new InputStreamReader(s.getInputStream()));
     writer = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
     writer.write("L0");
     writer.newLine();
     writer.flush();
     String input = reader.readLine();
     StringTokenizer st = new StringTokenizer(input, ",");
     nameList.add("[select a name]");
     int size = st.countTokens() / 2;
     idList = new long[size+1];
          for ( int i=1; i<=size; i++ ) {
               idList[i] = Long.parseLong(st.nextToken());
               nameList.add(st.nextToken());
     catch(UnknownHostException ue){
     catch(IOException ioe){
     switch(appType){
     case 0:                                                                           // Applet extends panel
     FrontEnd.add(p);
     break;
     case 1:                                                                           // Application
     FrontEnd = new Frame("Address Front End");
     myWindowListener = new MyWindowListener();
     addWindowListener(myWindowListener);
     p.add(exit);
     FrontEnd.add(p);
     FrontEnd.setSize(30,60);
     FrontEnd.setVisible(true);
     break;
public class MyWindowListener implements WindowListener{
     public void actionPerformed(ActionEvent ae){
          if(ae.getSource() == exit){
          fileExit();
          else if (ae.getSource() == clear){
          fileClear();
     public void itemStateChanged(ItemEvent e) {     }
     public void windowActivated(WindowEvent we){     }
     public void windowClosed(WindowEvent we){     }
     public void windowClosing(WindowEvent we){ fileExit();}
     public void windowDeactivated(WindowEvent we){     }
     public void windowDeiconified(WindowEvent we){     }
     public void windowIconified(WindowEvent we){     }
     public void windowOpened(WindowEvent we){     }
     private void fileExit(){
     FrontEnd.dispose();
     System.exit(0);
private void fileClear(){
//          FrontEnd.clear();

Answer 1

case 1: // Application
FrontEnd = new Frame("Address Front End");
MyWindowListener myWindowListener = new MyWindowListener();
addWindowListener(myWindowListener);
p.add(exit);
FrontEnd.add(p);
FrontEnd.setSize(30,60);
FrontEnd.setVisible(true);
break;
....