How to do a last command before closing JFrame?

Question

Hi, I'm working on a GUI, and there is a TextArea, which is set to the System.out.print commands, and i'd like it to save into a file, when i close the jframe, by pressing the X in the upper right corner.
I've made a working saving void, the only problem is: - How can i do it so that i can run a command (the saving) before the JFrame exits, and the whole program closes?
I've tried to use the tutorial here
http://java.sun.com/docs/books/tutorial/uiswing/events/windowlistener.html
But it is either requiring me to make my class file into abstract which gives me other errors, or nothing would happen when i press the X.
I have the needed stuff imported, i've tried following the example java file on that page as i could, i still cannot be able to do it. I've also tried to compile the example file itself, there were no errors, but when i tried to run it, it closed with some errors.
Any ideas?

Answer 1

By using the WIndowAdapter class, you can avoid having to add empty methods for WindowListener. Try this on your JFrame:yourJFrame.addWindowListener (new WindowAdapter () {
    public void windowClosing (WindowEvent e) {
        System.out.println("Window closing");
});It's the same as adding any other Listener.
db