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Please help me kill this java thread..... code example

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I am using a JVM for a mobile device based on java 1.4, ~old I know, but it is what I must use.

I am creating a simple swing application with a gui and a barcode laser scanner api. I place the swing gui thread in the AWT-EventQueue, and then I place barcode scanner code in a worker thread to feed the gui scanned item codes. Problem is, that when I click exit on the gui, ONLY the gui shuts down. I can't seem to kill the worker thread. Have a look:

public class Main extends javax.swing.JFrame implements ActionListener, ScannerListener, ItemListener, KeyListener {
   Scanner scanner;

public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Main().setVisible(true);
            }
        });
    }

 public Main() {
         //display GUI - a simple field to display the item number when the
         // barcode scanner trigger is pressed, and a exit button to close the app
        initComponents();
        // launch the scanner code to feed the gui scanned items
        worker = new Runnable()
                           {
                              public void run()
                              {
                                 try
                                 {
                                  //a while loop to scan and wait   
                                   launchScanner();  
                                 }
                                 catch (Exception e) {                               }
                            };
                            scannerThread = new Thread(worker);
                            scannerThread.start();
    }



  private void shutdown(java.awt.event.ActionEvent evt) {                          
          //this will shutdown the gui when the exit button is pressed. BUT how do I kill the scanner thread?
        System.exit(0); 
    }                         

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Please help me kill this java thread..... code example kedward777@gmail.com - 2012-11-15 07:06 -0800
  Re: Please help me kill this java thread..... code example kedward777@gmail.com - 2012-11-15 07:09 -0800
    Re: Please help me kill this java thread..... code example Knute Johnson <nospam@knutejohnson.com> - 2012-11-15 08:42 -0800
  Re: Please help me kill this java thread..... code example Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-15 11:49 -0500
    Re: Please help me kill this java thread..... code example kedward777@gmail.com - 2012-11-15 10:16 -0800
      Re: Please help me kill this java thread..... code example Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-15 13:33 -0500
        Re: Please help me kill this java thread..... code example kedward777@gmail.com - 2012-11-15 10:56 -0800
          Re: Please help me kill this java thread..... code example Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-15 14:21 -0500
  Re: Please help me kill this java thread..... code example Roedy Green <see_website@mindprod.com.invalid> - 2012-11-15 13:37 -0800

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