@Override
	public User CheckUserInfo(User user) {
		if(null == users)
			getAllUsers();
		if(null ==user.getQQnumber() || user.getQQnumber().equals("") || 
				null ==user.getPasssword() || user.getPasssword().equals(""))
		return null;
		for(User temp :users) {
			if(temp.getQQnumber().equals(user.getQQnumber()) && temp.getPasssword().equals(user.getPasssword()))
				return temp;
		}
		return null;
			
	}