public class myUIForm
{
    //---------------------------------------------------------------------------------
    //A button click or something calls DoFolderSync()
    // While the folder sync is happening, the UI is updated via the event handler(s).
    // Since it's running on a separate thread, our UI updates are visible/painted
    //---------------------------------------------------------------------------------

    public void DoFolderSync(java.io.File folder1, java.io.File folder2)
    {
        FolderSync fs = FolderSync(folder1, folder2);

        // Register for FileCopiedEvents from fs
        fs.addFileCopiedEventListener(new FolderSync.FileCopiedEventListener() {
            @Override
            public void OnFileCopied(FileCopiedEvent evt) {
                //Do something with the event
                //Maybe updating UI elements
            }
        });

        Thread t = new Thread(fs);
        t.start();			
    }
}


//-------------------------------------------------------------------
// "implements Runnable" and the run() method are required
// The run() method is called when the thread is "start"ed
//-------------------------------------------------------------------
public class FolderSync implements Runnable {

    @Override
    public void run() {
        try
        {
            SyncFolders();
        } catch (Exception e) {
            /* TODO - Handle the exception */ 
        }
    }



    //---------------------------------------------------------------------------
    // The following is not required for the Runnable class or thread execution, 
    // but gives a little context
    //---------------------------------------------------------------------------

    java.io.File _folder1;
    java.io.File _folder2;
    public FolderSync(java.io.File folder1, java.io.File folder2)
    {
        _folder1 = folder1;
        _folder2 = folder2;
    }


    private void SyncFolders()
    {
        //Do something
        //Do something
        //Do something
        //Raise the OnFileCopied event
        //Do somthing
		
    }

    // IT WOULD ALSO CONTAIN THE OnFileCopied EVENT DEFINITIONS, BUT THAT'S ANOTHER SAMPLE

}