package cn.lijun.entity;public class Student1 {    private int id;    private String sname;    private int gender;    private String brithday;    @Override    public String toString() {        return "Student1{" +                "id=" + id +                ", sname='" + sname + '\'' +                ", gender=" + gender +                ", brithday='" + brithday + '\'' +                '}';    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getSname() {        return sname;    }    public void setSname(String sname) {        this.sname = sname;    }    public int getGender() {        return gender;    }    public void setGender(int gender) {        this.gender = gender;    }    public String getBrithday() {        return brithday;    }    public void setBrithday(String brithday) {        this.brithday = brithday;    }}package cn.linjun.demo;/** 使用PreparedStatement  查询一条数据   封装成一个学生的Student1对象* **/import JdbcUtils.JdbcDemo2;import JdbcUtils.JdbcUtils;import cn.lijun.entity.Student1;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;public class Demo3Student {    public static void main(String[] args) throws SQLException {        //创建学生对象        Student1 s=new Student1();        Connection conn = JdbcUtils.getConnection();        PreparedStatement ps = conn.prepareStatement("select * from student1 where id=?");        ps.setInt(1,1);        ResultSet rs = ps.executeQuery();        if(rs.next()){           //封装成一个学生对象            s.setId(rs.getInt("id"));            s.setSname(rs.getString("sname"));            s.setGender(rs.getInt("gender"));            s.setBrithday(rs.getString("brithday"));        }        JdbcUtils.close(rs,ps,conn);        System.out.println(s);    }}