public void ordena()
    {
        for (int i=0; i<cads.length - 1; i++)
        {
            for (int j=0; j<cads.length-1-i; j++)
            {
                if (cads[j].compareTo(cads[j+1]) > 0)
                {
                    String aux = cads[j];
                    cads [j] = cads [j+1];
                    cads [j+1] = aux;
                }
            }
        }
    }