diff --git "a/19 \345\275\255\345\213\207\346\226\214/\345\260\201\350\243\205.md" "b/19 \345\275\255\345\213\207\346\226\214/\345\260\201\350\243\205.md"
index ec9c257ba7f8d7ba123b85cfe2d161b3763461b5..38a84963605c9dff71efe5c8ee8b832921c983d2 100644
--- "a/19 \345\275\255\345\213\207\346\226\214/\345\260\201\350\243\205.md"	
+++ "b/19 \345\275\255\345\213\207\346\226\214/\345\260\201\350\243\205.md"	
@@ -1,20 +1,20 @@
-将id、name、sex封装起来，并放在集合里实现功能
-
 ```java
-public class Test01{
+import javax.xml.namespace.QName;
+
+public class Student {
     private int id;
     private String name;
     private String sex;
 
-    public Test01() {
-    }
-
-    public Test01(int id, String name, String sex) {
+    public Student(int id, String name, String sex) {
         this.id = id;
         this.name = name;
         this.sex = sex;
     }
 
+    public Student() {
+    }
+
     public int getId() {
         return id;
     }
@@ -41,164 +41,87 @@ public class Test01{
 
     @Override
     public String toString() {
-        return  "编号：" + id +
-                "，姓名：" + name +
-                "，性别：" + sex ;
+        return "Student{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", sex='" + sex + '\'' +
+                '}';
     }
-public class DBUtil {
-    private static final String url = "jdbc:mysql:///student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
-    private static final String username = "root";
-    private static final String password = "root";
-    static {
-        try {
-            Class.forName("com.mysql.jdbc.Driver");
-        } catch (ClassNotFoundException e) {
-            System.out.println("驱动注册异常");
-            e.printStackTrace();
-        }
-    }
-    public static Connection getConn(){
-        Connection conn = null;
-        try {
-            conn = DriverManager.getConnection(url, username, password);
-        } catch (SQLException e) {
-            System.out.println("连接异常，检查url等");
-            e.printStackTrace();
-        }
-        return conn;
-
-    }
-    public static ResultSet select(String select, Object ...values){
-        Connection conn = getConn();
-        ResultSet rs = null;
-        try {
-            PreparedStatement stmt = conn.prepareStatement(select);
-            for (int i = 0; i < values.length; i++) {
-                stmt.setObject((i+1),values[i]);
+}
+import java.sql.*;
+public class All {
+        private static final String url = "jdbc:mysql:///user?useSSL=false&useUnicode=true&characterEncoding=utf8";
+        private static final String use = "root";
+        private static final String password = "root";
+        static {
+            try {
+                Class.forName("com.mysql.jdbc.Driver");
+            } catch (ClassNotFoundException e) {
+                System.out.println("驱动注册异常");
             }
-            rs = stmt.executeQuery();
-        } catch (SQLException e) {
-            System.out.println("SQL执行异常");
-            e.printStackTrace();
         }
-        return rs;
-    }
-    public static int update(String sql,Object ...values){
-        Connection conn = getConn();
-        int num = 0;
-        try {
-            PreparedStatement stmt = conn.prepareStatement(sql);
-            for (int j = 0; j < values.length; j++) {
-                stmt.setObject((j+1),values[j]);
+        public static Connection getConn(){
+            Connection conn = null;
+            try {
+                conn = DriverManager.getConnection(url, use, password);
+            } catch (SQLException e) {
+                System.out.println("获取失败");
             }
-            num = stmt.executeUpdate();
-        } catch (SQLException e) {
-            System.out.println("SQL语句异常");
-            e.printStackTrace();
+            return conn;
         }
-        return num;
-    }
-}
-public class Test02{
-    static Scanner sc = new Scanner(System.in);
-    static Connection conn = DBUtil.getConn();
-    public static void main(String[] args) {
-        out:
-        while (true) {
-            System.out.print("=========操作序号列表========\n" +
-                    "1.查询信息\n" +
-                    "2.添加功能\n" +
-                    "3.修改功能\n" +
-                    "4.删除功能\n" +
-                    "5.退出系统\n" +
-                    "输入序号进行对应操作：");
-            int i = 0;
+        public static ResultSet getSql(String sql,String ...keys){
+            ResultSet re = null;
             try {
-                i = sc.nextInt();
-            } catch (Exception e) {
-                System.out.println("非法字符！请按要求输入！");
+                Connection conn = getConn();
+                PreparedStatement pre = conn.prepareStatement(sql);
+                for (int i = 0; i < keys.length; i++) {
+                    pre.setString((i+1),keys[i]);
+                }
+                re = pre.executeQuery();
+            } catch (SQLException e) {
+                System.out.println("sql异常");
                 e.printStackTrace();
             }
-            switch (i){
-                case 1:
-                    selectTest01();
-                    break;
-                case 2:
-                    addTest01();
-                    break;
-                case 3:
-                    updateTest01();
-                    break;
-                case 4:
-                    deleteTest01();
-                    break;
-                case 5:
-                    try {
-                        conn.close();
-                    } catch (SQLException e) {
-                        System.out.println("SQL执行错误");
-                        e.printStackTrace();
-                    }
-                    System.out.println("即将退出，期待下次登录");
-                    break out;
-                default:
-                    System.out.println("请按要求进行操作！！");
-            }
-        }
-    }
-
-    private static void deleteTest01() {
-        System.out.print("请输入要删除的学生学号：");
-        int id = sc.nextInt();
-        int i = DBUtil.update("delete from student where id = ?",id);
-        if (i>0){
-            System.out.println("删除成功");
-        }else {
-            System.out.println("删除失败");
-        }
-    }
-
-    private static void updateTest01() {
-        System.out.print("请输入要修改的学号：");
-        int id = sc.nextInt();
-        System.out.print("请输入要修改的姓名：");
-        String name = sc.next();
-        System.out.print("请输入要修改的性别：");
-        String sex = sc.next();
-        int i=DBUtil.update("update student set name =?,sex=? where id=? ",name,sex,id);
-        if (i>0){
-            System.out.println("修改成功");
-        }else {
-            System.out.println("修改失败");
+            return re;
         }
-    }
-
-    private static void addTest01() {
-        System.out.print("请输入学号：");
-        int id = sc.nextInt();
-        System.out.print("请输入姓名：");
-        String name = sc.next();
-        System.out.print("请输入性别男或女：");
-        String sex = sc.next();
-        int i = DBUtil.update("insert into student values (?,?,?)",id,name,sex);
-        if (i>0){
-            System.out.println("添加成功！");
+        public static int getUpdat(String sql,String ...keys){
+            int num = 0;
+            try {
+                Connection conn = getConn();
+                PreparedStatement pre = conn.prepareStatement(sql);
+                for (int i = 0; i < keys.length; i++) {
+                    pre.setString((i+1),keys[i]);
+                }
+                num = pre.executeUpdate();
+            } catch (SQLException e) {
+                System.out.println("sql异常");
+                e.printStackTrace();
+            }
+            return num;
         }
-    }
+}
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
 
-    private static void selectTest01() {
-        ResultSet resultSet = DBUtil.select("select * from student");
-        ArrayList<Test01> list = new ArrayList<>();
+public class Text {
+    public static void main(String[] args) {
+        ArrayList<Student> list = new ArrayList<>();
+        String sql = "select * from biao";
+        ResultSet res = All.getSql(sql);
         try {
-            while (resultSet.next()){
-                list.add(new Test01(resultSet.getInt(1),resultSet.getString(2),resultSet.getString(3)));
+            while (res.next()){
+                int id = res.getInt(1);
+                String name = res.getString(2);
+                String sex = res.getString(3);
+                list.add(new Student(id,name,sex));
             }
         } catch (SQLException e) {
-            throw new RuntimeException(e);
+            System.out.println("sql异常");
+            e.printStackTrace();
         }
         for (int i = 0; i < list.size(); i++) {
-            Test01 test01 = list.get(i);
-            System.out.println(test01);
+            System.out.println(list.get(i));
         }
     }
 }