JAVA问题啊

原程序:
import java.sql.SQLException;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.DriverManager;
import java.sql.Date;
public class QueryODBCTest
{
private Connection con;
public static void main(String[] args)
{
QueryODBCTest test = new QueryODBCTest();
Connection con = test.getConnection();
String sql = "select * from student";
test.getStudent(con, sql);
}
public void getStudent(Connection con, String sql)
{
try
{
Statement st = con.createStatement();
ResultSet rs = st.executeQuery(sql);
while(rs.next())
{
String name = rs.getString("studentName");
String number = rs.getString("studentNumber");
Date date = rs.getDate("studentBirthday");
String sex = rs.getString("studentSex");
System.out.println(("\nstudentName:

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