Timer and action listener

I would like make a program the counts down from 10 to 0.
When it reaches 0 it says Blast off and exits.

It needs to use an action listener.And display the countdown in
a JTextfield.
It is to use the timer class from the swing package.

I am a struggling any help appreciated.

public class Rocket extends JFrame
{
private int count=10;
private JTextField display;



}