连接数据库为什么出现这种异常？？？？？？？？？？？

Question

java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Invalid operation for the current cursor position.
at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source)
at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source)
at com.microsoft.jdbc.base.BaseResultSet.validateCursorPosition(Unknown Source)
at com.microsoft.jdbc.base.BaseResultSet.getInt(Unknown Source)
at net.acai.database.DBConnect.main(DBConnect.java:187)
数据库中就一个表，表有两个字段，
ResultSet rs=conn.stmt.executeQuery("select * from class");
          
            System.out.println(rs.getInt(1));
           System.out.println(rs.getString(2));
          }catch(Exception e){
            e.printStackTrace();
          }stmt为statement的实例

Answer 1

ResultSet rs=conn.stmt.executeQuery("select * from class");
          while(rs.next())
         {
            System.out.println(rs.getInt(1));
           System.out.println(rs.getString(2));
         }
 没有移动游标的位置，操作出错