public static void EscriureFitxer(String nom,String cognom1,String cognom2,String dni,File FILE_NAME,ArrayList<Alumne> list){
                Alumne a = new Alumne (nom,cognom1,cognom2,dni);
                list.add(a);
                ObjectOutputStream objectOutput = null;
                try {
                    objectOutput = new ObjectOutputStream(new FileOutputStream(FILE_NAME));
                    objectOutput.writeObject(list);

                    System.out.println("S'ha generat el fitxer " + FILE_NAME);

                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    if(objectOutput != null) {
                        try {
                objectOutput.close();
                        } catch (IOException ignored) {
                        }
                    }
                }
}