Cool Forum Cybersecurity, 5:30 Tuesday, Engineering classroom 002. If you have an interest in this hot field, this is a great way to learn about it and to learn something about computer security.

    public static void main(String[] args)
    {   
        ArrayList<String> al = new ArrayList<>();
        int n = Integer.parseInt(args[0]);
        for(int k = 0; k < n; k++)
        {   
            al.add("" + k);
        }
        Collections.shuffle(al);
        System.out.println(al);
        trickle(al);
        System.out.println(al);
    }