diff --git a/README.md b/README.md
index 51146a59bcd1bea84c8cf8322aeb06d393a42456..320286807f67e6a855e5b6671e849dc3adc78595 100644
--- a/README.md
+++ b/README.md
@@ -283,7 +283,22 @@
 ![img.png](img/img_memento_pattern_eg.png)
 
 ### 6.8.2 备忘录模式原理
+![img.png](img/img_memento_pattern_principple.png)
+### 6.8.5 备忘录模式总结
 
+**1 ) 备忘录模式的优点**
+
+1. 提供了一种状态恢复的实现机制,使得用户可以方便的回到一个特定的历史步骤,当新的状态无效或者存在问题的时候,可以使用暂时存储起来的备忘录将状态复原.
+2. 备忘录实现了对信息的封装,一个备忘录对象是一种发起者对象状态的表示,不会被其他代码所改动.备忘录保存了发起者的状态,采用集合来存储备忘录可以实现多次撤销的操作
+
+**2 ) 备忘录模式的缺点**
+
+-  资源消耗过大,如果需要保存的发起者类的成员变量比较多, 就不可避免的需要占用大量的存储空间,每保存一次对象的状态,都需要消耗一定系统资源
+
+**3) 备忘录模式使用场景**
+
+1. 需要保存一个对象在某一时刻的状态时,可以使用备忘录模式.
+2. 不希望外界直接访问对象内部状态时.
 ![img.png](img/img_memento_pattern_principle.png)
 
 备忘录模式的主要角色如下：
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/memento/example02/MainApp.java b/byv-memento-patttern-19/src/main/java/com/boyunv/memento/example02/MainApp.java
new file mode 100644
index 0000000000000000000000000000000000000000..4477642268bdbfa4e2f5ca0666edc16de0b56bba
--- /dev/null
+++ b/byv-memento-patttern-19/src/main/java/com/boyunv/memento/example02/MainApp.java
@@ -0,0 +1,41 @@
+package com.boyunv.memento.example02;
+/*
+ *@description
+ *
+ *@author boyunv
+ *@create 2023/9/5 22:46
+ *@version 1.0
+ */
+
+public class MainApp {
+    public static void main(String[] args) throws InterruptedException {
+        
+        //创建玩家类,设置初始金币
+        Player player = new Player(100);
+        //c创建备忘录对象
+        Memento memento = player.createMemento();
+        for (int i = 0; i < 100; i++) {
+            
+            //显示一下扔骰子的次数
+            System.out.println("================第"+i+"次投掷");
+            //显示当前的玩家状态
+            System.out.println("当前状态:"+player);
+            
+            //开启游戏
+            player.yacht();
+            System.out.println("玩家所持有的金币:"+player.getMoney()+"元");
+            //复活操作
+            if(player.getMoney()> memento.getMoney()){
+                System.out.println("赚到金币,保存当前的状态,继续游戏");
+                player.createMemento();//更新快照
+            } else if (player.getMoney()< player.getMoney()/2) {
+                System.out.println("所持有的金币不多了,游戏恢复初始状态");
+                player.restoreMemento(memento);
+            }
+            
+            Thread.sleep(1000);
+            
+        }
+        
+    }
+}
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/memento/example02/Memento.java b/byv-memento-patttern-19/src/main/java/com/boyunv/memento/example02/Memento.java
new file mode 100644
index 0000000000000000000000000000000000000000..55bf9f614a61da875a785d8f13abbf78ed6a9836
--- /dev/null
+++ b/byv-memento-patttern-19/src/main/java/com/boyunv/memento/example02/Memento.java
@@ -0,0 +1,40 @@
+package com.boyunv.memento.example02;
+/*
+ *@description
+ *  表示备份玩家的状态
+ *@author boyunv
+ *@create 2023/9/5 22:18
+ *@version 1.0
+ */
+
+import java.util.ArrayList;
+import java.util.List;
+
+class Memento {
+    
+   private int money;//玩家的金钱
+    
+    ArrayList fruits;  //玩家获取的水果
+    
+    public Memento(int money) {
+        this.money = money;
+        this.fruits=new ArrayList();
+        
+    }
+    
+    //获取当前玩家的金币
+    public  int getMoney(){
+        return money;
+    }
+    
+    //获取当前玩家的水果
+    List getFruits(){
+        return (List) fruits.clone();
+    }
+    
+    //添加水果的方法
+    void addFruit(String fruit){
+        fruits.add(fruit);
+    }
+    
+}
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/memento/example02/Player.java b/byv-memento-patttern-19/src/main/java/com/boyunv/memento/example02/Player.java
new file mode 100644
index 0000000000000000000000000000000000000000..7237421b24c52a985751b126fa2e573851d928a9
--- /dev/null
+++ b/byv-memento-patttern-19/src/main/java/com/boyunv/memento/example02/Player.java
@@ -0,0 +1,96 @@
+package com.boyunv.memento.example02;
+/*
+ *@description
+ *  玩家类
+ *@author boyunv
+ *@create 2023/9/5 22:27
+ *@version 1.0
+ */
+
+import lombok.ToString;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+public class Player {
+    
+    private int money;  //金币
+    
+    private List<String> fruits=new ArrayList<>();  //玩家获得的水果
+    
+    private static  String[] fruitsName={    //表示水果种类的数组
+            "苹果","葡萄","香蕉","橘子"
+    };
+    
+    Random random=new Random();
+    
+    public Player(int money) {
+        this.money = money;
+    }
+    
+    //获取当前所有金币
+    public int getMoney(){
+        return  money;
+    }
+    
+    //获取一个水果
+    public String  getFruit(){
+        String prefix="";
+        if (random.nextBoolean()){
+            prefix="好吃的";
+        }
+        
+        //从 数组中拿一个水果
+        String f=fruitsName[random.nextInt(fruitsName.length)];
+        return prefix+f;
+    }
+    
+    //掷色子的方法
+    public  void  yacht(){
+        int dice=random.nextInt(6)+1;  //掷骰子
+        if(dice==1){
+            money+=100;
+            System.out.println("所持有的金币增加了>>");
+        } else if (dice==2) {
+            money/=2;
+            System.out.println("所持有的金币减少一半");
+                    
+        } else if (dice==6) {
+            //获取水果
+            String fruit = getFruit();
+            System.out.println("获取了一个水果:"+fruit);
+            fruits.add(fruit);
+            
+        }else {
+            System.out.println("无效数字,继续投递");
+        }
+        
+    }
+    //拍摄快照
+    public Memento createMemento(){
+        Memento memento = new Memento(money);
+        for (String fruit : fruits) {
+            //判断:只保存  "好吃的"  水果
+            if (fruit.startsWith("好吃的")){
+                memento.addFruit(fruit);
+            }
+        }
+        
+        return  memento;
+    }
+    
+    //撤销的方法
+    public  void  restoreMemento(Memento memento){
+        this.money= memento.getMoney();
+        this.fruits=memento.getFruits();
+    }
+    
+    @Override
+    public String toString() {
+        return "Player{" +
+                "money=" + money +
+                ", fruits=" + fruits +
+                '}';
+    }
+}
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Acceptable.java b/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Acceptable.java
deleted file mode 100644
index 9b04250b0c6d19d4257504f502d5ca09387f4213..0000000000000000000000000000000000000000
--- a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Acceptable.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package com.boyunv.visitor.example01;
-/*
- *@description
- *  接待者接口  (抽下昂元素接口)
- *@author boyunv
- *@create 2023/9/3 9:42
- *@version 1.0
- */
-
-public interface Acceptable {
-    
-    //接受所有visitor访问者的子类
-    public  void  accept(Visitor visitor);
-}
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Candy.java b/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Candy.java
deleted file mode 100644
index b9ced9d2f9a907dfeaba614a6aa40744437f5b80..0000000000000000000000000000000000000000
--- a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Candy.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.boyunv.visitor.example01;
-/*
- *@description
- *  糖果类
- *@author boyunv
- *@create 2023/9/3 9:21
- *@version 1.0
- */
-
-import java.time.LocalDate;
-
-public class Candy extends Product implements Acceptable{
-    public Candy(String name, LocalDate producedDate, double price) {
-        super(name, producedDate, price);
-    }
-    
-    
-    @Override
-    public void accept(Visitor visitor) {
-        //accept方法中调用访问者,并将this传递回去
-        visitor.visit(this);
-        
-    }
-}
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Client.java b/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Client.java
deleted file mode 100644
index e18059e62c4bd5353b6affb6973a3e9192bf7900..0000000000000000000000000000000000000000
--- a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Client.java
+++ /dev/null
@@ -1,48 +0,0 @@
-package com.boyunv.visitor.example01;
-/*
- *@description
- *
- *@author boyunv
- *@create 2023/9/3 9:37
- *@version 1.0
- */
-
-import java.text.NumberFormat;
-import java.time.LocalDate;
-import java.util.Arrays;
-import java.util.List;
-
-public class Client {
-    public static void main(String[] args) {
-        LocalDate billDate = LocalDate.now();
-        
-        Candy candy = new Candy("徐福记",LocalDate.of(2022,10,1),10.0);
-        System.out.println("糖果: " + candy.getName());
-        
-        double rate = 0.0;
-        
-        long days = billDate.toEpochDay() - candy.getProducedDate().toEpochDay();
-        System.out.println(days);
-        
-        if(days > 180){
-            System.out.println("超过半年的糖果,请勿食用!");
-        }else{
-            rate = 0.9;
-            double discountPrice = candy.getPrice() * rate;
-            System.out.println("打折后的价格"+ NumberFormat.getCurrencyInstance().format(discountPrice));
-        }
-        
-        //三件商品加入购物车  //模拟添加多个商品
-        List<Acceptable> products = Arrays.asList(
-                new Candy("金丝猴奶糖",LocalDate.of(2022,6,10),10.00),
-                new Wine("衡水老白干",LocalDate.of(2020,6,10),100.00),
-                new Fruit("草莓",LocalDate.of(2022,10,12),50.00,1)
-        );
-        
-        Visitor visitor = new DiscountVisitor(LocalDate.of(2022,10,17));
-        for (Acceptable product : products) {
-            product.accept(visitor);
-        }
-        
-    }
-}
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/DiscountVisitor.java b/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/DiscountVisitor.java
deleted file mode 100644
index c69c7c508c91d2a314c38dc63c068a63a6964133..0000000000000000000000000000000000000000
--- a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/DiscountVisitor.java
+++ /dev/null
@@ -1,63 +0,0 @@
-package com.boyunv.visitor.example01;
-/*
- *@description
- *  折扣计价访问者类
- *@author boyunv
- *@create 2023/9/3 9:26
- *@version 1.0
- */
-
-import java.text.NumberFormat;
-import java.time.LocalDate;
-
-public class DiscountVisitor implements Visitor{
-    
-    private LocalDate billDate;
-    
-    public DiscountVisitor(LocalDate billDate) {
-        this.billDate = billDate;
-        System.out.println("结算日期: " + billDate);
-    }
-    
-    @Override
-    public void visit(Candy candy) {
-        System.out.println("糖果: " + candy.getName());
-        
-        //糖果大于180天,禁止售卖,否则九折
-        long days=billDate.toEpochDay()-candy.getProducedDate().toEpochDay();
-        if(days>180){
-            System.out.println("超过半年的糖果,请勿食用!");
-        }else{
-            double rate = 0.9;
-            double discountPrice = candy.getPrice() * rate;
-            System.out.println("糖果打折后的价格"+ NumberFormat.getCurrencyInstance().format(discountPrice));
-        }
-        
-    }
-    
-    @Override
-    public void visit(Wine wine) {
-        System.out.println("酒类: " + wine.getName()+",无折扣价格!");
-        System.out.println("原价: "+NumberFormat.getCurrencyInstance().format(wine.getPrice()));
-    }
-    
-    @Override
-    public void visit(Fruit fruit) {
-        System.out.println("水果: " + fruit.getName());
-        //获取产品生产天数
-        long days = billDate.toEpochDay() - fruit.getProducedDate().toEpochDay();
-        
-        double rate = 0;
-        
-        if(days > 7){
-            System.out.println("超过七天的水果,请勿食用!");
-        }else if(days > 3){
-            rate = 0.5;
-        }else{
-            rate = 1;
-        }
-        
-        double discountPrice = fruit.getPrice() * fruit.getWeight() * rate;
-        System.out.println("水果价格: "+NumberFormat.getCurrencyInstance().format(discountPrice));
-    }
-}
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Fruit.java b/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Fruit.java
deleted file mode 100644
index f714d45afa59f3b874aa9dc84906e72afc712d1a..0000000000000000000000000000000000000000
--- a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Fruit.java
+++ /dev/null
@@ -1,37 +0,0 @@
-package com.boyunv.visitor.example01;
-/*
- *@description
- *
- *@author boyunv
- *@create 2023/9/3 9:22
- *@version 1.0
- */
-
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.Getter;
-import lombok.Setter;
-
-import java.time.LocalDate;
-
-public class Fruit extends Product implements Acceptable{
-    
-    @Setter
-    @Getter
-    private double weight;
-    
-    public Fruit(String name, LocalDate producedDate, double price) {
-        super(name, producedDate, price);
-    }
-    
-    public Fruit(String name, LocalDate producedDate, double price, double weight) {
-        super(name, producedDate, price);
-        this.weight = weight;
-    }
-    @Override
-    public void accept(Visitor visitor) {
-        //accept方法中调用访问者,并将this传递回去
-        visitor.visit(this);
-        
-    }
-}
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Product.java b/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Product.java
deleted file mode 100644
index 45366ccc128a74653da6e98ae805514dfc9b8a4a..0000000000000000000000000000000000000000
--- a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Product.java
+++ /dev/null
@@ -1,20 +0,0 @@
-package com.boyunv.visitor.example01;
-/*
- *@description
- * 抽象商品父类
- *@author boyunv
- *@create 2023/9/3 9:19
- *@version 1.0
- */
-
-import lombok.AllArgsConstructor;
-import lombok.Data;
-
-import java.time.LocalDate;
-@Data
-@AllArgsConstructor
-public abstract class Product {
-    private String name;  //商品名
-    private LocalDate producedDate;  // 生产日期
-    private double price;  //单品价格
-}
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Visitor.java b/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Visitor.java
deleted file mode 100644
index 83807c476d8d60c6a6a19a67cbbad62f8933be34..0000000000000000000000000000000000000000
--- a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Visitor.java
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.boyunv.visitor.example01;
-/*
- *@description
- *  访问者接口-根据入参不同调用对应的重载方法
- *@author boyunv
- *@create 2023/9/3 9:24
- *@version 1.0
- */
-
-public interface Visitor {
-    
-    public void visit(Candy candy);  //糖果重载方法
-    
-    public void visit(Wine wine);  //酒类重载方法
-    
-    public void visit(Fruit fruit);  //水果重载方法
-}
diff --git a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Wine.java b/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Wine.java
deleted file mode 100644
index e6b866ddc23e064257d5c0c6c0d7982a6326b411..0000000000000000000000000000000000000000
--- a/byv-memento-patttern-19/src/main/java/com/boyunv/visitor/example01/Wine.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package com.boyunv.visitor.example01;
-/*
- *@description
- *酒水类
- *@author boyunv
- *@create 2023/9/3 9:21
- *@version 1.0
- */
-
-import java.time.LocalDate;
-
-public class Wine extends Product implements Acceptable{
-    public Wine(String name, LocalDate producedDate, double price) {
-        super(name, producedDate, price);
-    }
-    
-    @Override
-    public void accept(Visitor visitor) {
-        //accept方法中调用访问者,并将this传递回去
-        visitor.visit(this);
-        
-    }
-}
diff --git a/img/img_memento_pattern_principple.png b/img/img_memento_pattern_principple.png
new file mode 100644
index 0000000000000000000000000000000000000000..1751add6e7e1d694b11769d56c21b74ff8ff468e
Binary files /dev/null and b/img/img_memento_pattern_principple.png differ