public void leer() throws FileNotFoundException, IOException, ClassNotFoundException{
        ObjectInputStream s=null;
        FileInputStream in = null;

        try {
            in = new FileInputStream(this.file);
            s = new ObjectInputStream(in);

        try{
                while(true){
                    j = (Juego) s.readObject();
                    Biblio.put(j.getNombre(),j);
                }

            }catch (EOFException e) {
                in.close();
        }

        }catch(FileNotFoundException ex) {
                return;
        }
        catch (IOException ex) {
            JOptionPane.showMessageDialog(null,"No Abrir/leer el archivo.Datos no cargados.");
            return;
        }
    }