Formatting JTextArea

[henri henri]

Would anyone know what is the best way to format a TreeSet into a JTextArea or if it is possible? I would like to display the rsults of Iteration over my film titles by category.

 
 

 
   public TreeSet getFilmTitles(String category) {
        Set set = container.keySet(); 
        Iterator it1 = set.iterator(); 
        Collection values = container.values(); 
        Iterator it2 = values.iterator(); 
            while((it2.hasNext()) && (it1.hasNext())) {
               String title = (String)it1.next();
               film = (FilmBean)it2.next();
               film_genre = (String)film.getGenre();
             if(film_genre.equals(category)) {
                 container.get(title);
                 System.out.print(title +"\n");
            }      
       } 
             return film_titles;
   }