public void setFriend(User friend) {
   this.friend = friend;
   setUserObject(friend.getFriendlyName());
 }
 @Override
 public int compareTo(SortableTreeNode o) {
   FriendTreeNode other = (FriendTreeNode) o;
   return friend.getFriendlyName().compareTo(other.getFriend().getFriendlyName());
 }
 public FriendTreeNode(User friend) {
   super(friend.getFriendlyName());
   this.friend = friend;
 }