JFileChooser dialogbox doesn't pop up?!

i am developing an applet, but facing with problems. i have implement Button in the applet to open file of the local system using JFileChooser. i have finally made that not crashing with the applet, but it doesn't open the dialogbox to select the file. Does anyone know why?
many Thanks
tim

Well ,Just In Case , if u really just need to read text,etc from a file on the server
[NOT USER's system !],u can do this :
try{
        java.net.URL   hp=new URL(getCodeBase()+"/in.txt");
                }catch(java.net.MalformedURLException ex){System.out.println(hp.toString());}
               //URLConnection hpCon=hp.openConnection();
               BufferedReader in=new BufferedReader(
                    new InputStreamReader(hp.openStream()));
           String inputLine;
     while ((inputLine = in.readLine()) != null){
     System.out.println(inputLine);
        // blah .. blah ...

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