public class Cella {
    private String matricola;
    public Cella next;
        public Cella(String matricola)
        {
            this(matricola,null);
        }
        public Cella(String matricola, Cella next)
        {
            this.matricola=matricola;
            this.next=next;
        }
        public String getMatricola()
        {
            return matricola;
        }
}