public void removeMeanFriends()
    {
        // YOUR CODE HERE
        // Remove all the friends who don't have you as a friend.
        // You may want to use the find method.
        ArrayList<Person> meanFriends = new ArrayList<Person>();
        for (Person each : friends)
        {
            if (each.find(this) == -1)
            {
                meanFriends.add(each);
            }
        }
        for (Person each : meanFriends)
        {
            friends.remove(this.find(each));
        }
    }