Typing Tutor program

Question

Hi,
Trying to write a typing tutor program. As you type a character it checks if it matches with the JTextArea. If it does match, it takes a snapshot of the text in the JTextField. If its wrong it sets the text back to the snapshot.
However, when I set the text back to the snapshot it displays the key typed aswell. How do I remove this character, so that only the snapshot is visible.
Heres the code:
//file:TTutor.java
//GUI typing tutor
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.String.*;
class TTutor extends JFrame{
    String[] phrase = {"In a world full of people", "Only some want to fly", "Isn't that crazy?"};
     final JTextArea area = new JTextArea();
     final JTextField field = new JTextField(40);
    String failString= new String("");
    int caretp;
    int x, y;
    GridBagConstraints constraints = new GridBagConstraints();
    int i = 0;
    public TTutor(){
     super("TTutor v1.0");
     setSize(600, 300);
     setLocation(200, 200);
     setLayout(new GridBagLayout());
     area.setFont(new Font("Serif",Font.PLAIN, 18));
     area.setText(phrase[0]);
     area.setEditable(false);
     Container content = getContentPane();
     addGB(area, x=1, y=0);
     Image image = Toolkit.getDefaultToolkit().getImage("keyboard.jpg");
     addGB(new ImageComponent(image), x=1, y=1);
     addGB(field, x=1, y=2);
     setVisible(true);
     field.requestFocus();
     field.addKeyListener(new MyKeyListener());
     void addGB(Component component, int x, int y){
         constraints.gridx=x;
         constraints.gridy=y;
         add(component, constraints);
    public void update(KeyEvent ke){
     char c = ke.getKeyChar();
     String cs = Character.toString(c);
     char ac = area.getText().charAt(i);
      String as = String.valueOf(ac);
      if (as.equals(cs)){
       snapshot();
          i++;
       System.out.println("match");
      if (!as.equals(cs)){
       wrong();
      System.out.println("wrong");
    void snapshot(){
         failString = field.getText();
     caretp = field.getCaretPosition();
    void wrong(){
     /*Probelm is here:
       How do I get the textField to write the string minus the key typed
      field.setText("");
      field.setText(failString);
      field.setCaretPosition(caretp);     
    public static void main(String[] args){
     JFrame f = new TTutor();
     f.addWindowListener(new WindowAdapter(){
          public void windowClosing(WindowEvent we){System.exit(0);}
     f.setVisible(true);
public class MyKeyListener extends KeyAdapter{
    public void keyTyped(KeyEvent ke){
     update(ke);
     Regards ABourke.

Answer 1

Ideally I would like to get the TextField to work like the one in this demo:
http://www.quazart.org/cgi-bin/newtyping/demo.pl