高手来看看这个鬼有关问题

public class UserDAOImpl implements UserDAO {    public User Login(int userid,String password) {        String sql = "select * from users where userid=? and password=?";        PreparedStatement ps = null;        ResultSet rs = null;        try {            ConFactory.DateBaseConnection();            ps = ConFactory.getConnection().prepareStatement(sql);            ps.setInt(1,userid);            ps.setString(2, password);            rs = ps.executeQuery();            if (rs.next()) {                User LoginUser = new User(//这里明明搞了个实例了，怎么下面RETURN时说找不到LoginUser呢？其他地方都没问题                        rs.getInt(1),                        rs.getString(2),                        rs.getString(3),                        rs.getInt(4));                                            }            rs.close();            ps.close();                    } catch (SQLException e) {            e.printStackTrace();            System.out.println("public boolean Login(User user) fail!!!!!!!!");        } finally {            ConFactory.closeConn();        }        return LoginUser;//报错没有找到LoginUser。unresorve..    }}

public class UserDAOImpl implements UserDAO {    public User Login(int userid,String password) {        String sql = "select * from users where userid=? and password=?";        PreparedStatement ps = null;        ResultSet rs = null;        User LoginUser=null//先在这里声明，你在try里面声明，然后在try外面用，当然不行         try {            ConFactory.DateBaseConnection();            ps = ConFactory.getConnection().prepareStatement(sql);            ps.setInt(1,userid);            ps.setString(2, password);            rs = ps.executeQuery();            if (rs.next()) {                LoginUser = new User(//这里改                                                    rs.getInt(1),                        rs.getString(2),                        rs.getString(3),                        rs.getInt(4));                                            }            rs.close();            ps.close();                    } catch (SQLException e) {            e.printStackTrace();            System.out.println("public boolean Login(User user) fail!!!!!!!!");        } finally {            ConFactory.closeConn();        }        return LoginUser;//这样就不会报错了    }}