JAVA相关，while (super.rs.next())，总是进不了循环，求解，多谢了

package epet;import java.sql.*;public class Pet {    protected Connection conn = null;    protected PreparedStatement pstmt = null;    protected ResultSet rs = null;    //驱动地址    private static final String DRIVER = "oracle.jdbc.driver.OracleDriver";    //连接字符串    private static final String URL = "jdbc:oracle:thin:@127.0.0.1:1521:ORACLE10";    //打开连接    protected void open() {        try {             Class.forName(DRIVER);        } catch (ClassNotFoundException e) {            e.printStackTrace();        }        try {            conn = DriverManager.getConnection(URL, "kzeson", "world");            System.out.println("连接成功！");        } catch (SQLException e) {            e.printStackTrace();        }    }    //关闭连接    protected void closeAll() {        try {            if (rs != null) {                rs.close();            }            if(pstmt!=null){                pstmt.close();            }            if(conn!=null){                conn.close();            }        } catch (SQLException e) {            e.printStackTrace();        }    }}第2个类-------------------------package epet;import java.util.*;import java.sql.SQLException;public class PetManage extends Pet {    Scanner input = new Scanner(System.in);    public void printPet() {        super.open();        String sql = "select id,name,age from tests";        try {            super.pstmt = super.conn.prepareStatement(sql);            super.rs = super.pstmt.executeQuery();            System.out.println("编号\t名字\t年龄");            System.out.println("------------------------------");            System.out.println(super.rs.next());            while (super.rs.next()) {                 System.out.println("wfwfwefwefwefw");                System.out.print(rs.getInt("id") + "\t");                System.out.print(rs.getString("name") + "\t");                System.out.println(rs.getInt("age") + "\t");            }        } catch (SQLException e) {            e.printStackTrace();        } finally {            super.closeAll();    

System.out.println(super.rs.next());这句话删掉。super都可以不要写的。当然也可以写试试下面的程序。import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.Scanner;class Pet {    protected Connection conn = null;    protected Statement pstmt = null;//没有条件要填，就用Stament    protected ResultSet rs = null;    //驱动地址    private static final String DRIVER = "oracle.jdbc.driver.OracleDriver";    //连接字符串    private static final String URL = "jdbc:oracle:thin:@127.0.0.1:1521:ORACLE10";    //打开连接    protected void open() {        try {             Class.forName(DRIVER);        } catch (ClassNotFoundException e) {            e.printStackTrace();        }        try {            conn = DriverManager.getConnection(URL, "kzeson", "world");            System.out.println("连接成功！");        } catch (SQLException e) {            e.printStackTrace();        }    }    //关闭连接    protected void closeAll() {        try {            if (rs != null) {                rs.close();            }            if(pstmt!=null){                pstmt.close();            }            if(conn!=null){                conn.close();            }        } catch (SQLException e) {            e.printStackTrace();        }    }}public class PetManage extends Pet {    Scanner input = new Scanner(System.in);    public void printPet() {        super.open();        String sql = "select id,name,age from tests";        try {            super.pstmt = super.conn.createStatement();            super.rs = super.pstmt.executeQuery(sql);            System.out.println("编号\t名字\t年龄");            System.out.println("------------------------------");            while (super.rs.next()){                 System.out.println("wfwfwefwefwefw");                System.out.print(rs.getInt("id") + "\t");                System.out.print(rs.getString("name") + "\t");                System.out.println(rs.getInt("age") + "\t");            }        } catch (SQLException e) {            e.printStackTrace();        } finally {            super.closeAll();        }    }}