package ceshiJDBC;

import java.util.Properties;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.security.KeyStore.ProtectionParameter;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
//object数组存储
public class ORMDemo {

static Properties pro=null;
static Connection con=null;
static PreparedStatement ps=null;
static ResultSet rs=null;
static Object[] obj=null;
static List<Object[]> list=new ArrayList<Object[]>();

static {
    try {
        pro=new Properties();
        pro.load(new FileReader("D:\\JavaEEeclipse\\ceshiJDBC\\src\\ceshiJDBC\\JDBC.properties"));
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
public static void main(String[] args) {


    try {
        Class.forName(pro.getProperty("mysqlDriver"));
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }

    try {
        con=new JDBCUtil().getCon();
        ps=con.prepareStatement("select username,regTime from t_user where id>?");
        ps.setInt(1, 2);
        rs=ps.executeQuery();
         obj=new Object[2];
        while(rs.next()) {
            obj[0]=rs.getString(1);
            obj[1]=rs.getDate(2);
            list.add(obj);
            System.out.println(rs.getString(1)+"--"+rs.getDate(2));
        }
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    for(Object[] lists:list) {

            System.out.println(""+lists[0]+lists[1]);

    }

}

}
输出结果：
nam--2017-11-27
??--2017-11-27
gerg--2017-11-27
rg--2017-11-27
rg2017-11-27
rg2017-11-27
rg2017-11-27
rg2017-11-27

为什么数据存到集合中时正常，而最后都被覆盖了？
就是说，为什么最后结果都是rg2017-11-27？？