Mine

    public int createMailbox(String user)
    {
        if(mailboxes.containsKey("user")){
            return 0;
        }
        List<MailItem> mailbox;
        mailbox = new ArrayList<MailItem>();
        mailboxes.put(user, mailboxMailItem);
        return 1;
    }


public int createMailbox(String user) {
 if(mailboxes.containsKey(user)
  return 0;
 mailboxes.put(user, new ArrayList<MailItem);
 return 1;
}