Set-Get（？占位符）-Java(新手)

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创建实体类：

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 package JdbcDome;

 public class EmpL {
     private int uid;
     private String uNAME;
     private int age;
     private String sexs;

     public int getId() {
         return uid;
     }

     public void setId(int id) {
         this.uid = id;
     }

     public String getuNAME() {
         return uNAME;
     }

     public void setuNAME(String uNAME) {
         this.uNAME = uNAME;
     }

     public int getAge() {
         return age;
     }

     public void setAge(int age) {
         this.age = age;
     }

     public String getSexs(String sexs) {
         return this.sexs;
     }

     public void setSexs(String sexs) {
         this.sexs = sexs;
     }

     @Override
     public String toString() {
         return "EmpL{" +
                 "id=" + uid +
                 ", uNAME='" + uNAME + '\'' +
                 ", age=" + age +
                 ", sexs='" + sexs + '\'' +
                 '}';
     }
 }

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运行：

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 package JdbcDome;

 import java.sql.*;
 import java.util.*;

 public class JdbcDome1 {
     public static void main(String[] args) throws Exception {
             fun1();
     }
     public static void fun1() throws Exception {
         //创建一个对象。
         EmpL e = new EmpL();
         //注册驱动。
         Connection conn = JDBCUtils.getConnection();
         //链接SQL表。
         PreparedStatement ptst = conn.prepareStatement("select * from students where uid = ?");
        //设置参数。
         ptst.setInt(1,3);
         ResultSet rs = ptst.executeQuery();
         if (rs.next()){
             //封装成对象。
             e.setId(rs.getInt("uid"));
             e.setuNAME(rs.getString("uNAME"));
             e.setAge(rs.getInt("ages"));
             e.getSexs(rs.getString("sexs"));

         }
         JDBCUtils.close(conn,ptst, rs);
         System.out.println(e);
     }
 }