ArrayList<Aluno> al = (ArrayList)ler.readObject();
            ler.close();
            System.out.print(al);

        }
    } catch (FileNotFoundException ex) {
        System.out.printf("Nao encontrado");
        System.exit(0);
    } catch (IOException ex) {
        ex.printStackTrace();
    } catch (ClassNotFoundException ex) {
        System.out.printf("Nao encontrado.n");
        System.exit(0);
    }