feat(备忘录模式）：create

java/com/kongxiang/raindrop/dp/type/behavior/memento/GameMemento.java

+package com.kongxiang.raindrop.dp.type.behavior.memento;
+
+import lombok.ToString;
+
+import java.util.List;
+
+/**
+ * 游戏存档（Memento）
+ *
+ * @author 孔翔
+ * @since 2023-10-20
+ * copyright for author : 孔翔 at 2023-10-20
+ * dp
+ */
+@ToString
+public class GameMemento {
+
+    private int level;
+
+    private List<String> equipment;
+
+
+    public GameMemento(int level, List<String> equipment) {
+        this.level = level;
+        this.equipment = equipment;
+    }
+
+    public int getLevel() {
+        return level;
+    }
+
+    public List<String> getEquipment() {
+        return equipment;
+    }
+}

java/com/kongxiang/raindrop/dp/type/behavior/memento/HistoryMemento.java

+package com.kongxiang.raindrop.dp.type.behavior.memento;
+
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * 历史备份(CareTaker)
+ * 管理备份
+ *
+ * @author 孔翔
+ * @since 2023-10-20
+ * copyright for author : 孔翔 at 2023-10-20
+ * dp
+ */
+public class HistoryMemento {
+
+    private static final List<GameMemento> history = new LinkedList<>();
+
+    /**
+     * 保存存档（备忘录）
+     */
+    public void addHistory(GameMemento game) {
+        history.add(game);
+    }
+
+    /**
+     * 选择指定的存档（备忘录）
+     */
+    public GameMemento loadHistory(int index) {
+        return history.get(index);
+    }
+
+    public void list() {
+        history.forEach(System.out::println);
+    }
+}

java/com/kongxiang/raindrop/dp/type/behavior/memento/HostGame.java

+package com.kongxiang.raindrop.dp.type.behavior.memento;
+
+import lombok.Getter;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * 主机游戏（Originator)
+ *
+ * @author 孔翔
+ * @since 2023-10-20
+ * copyright for author : 孔翔 at 2023-10-20
+ * dp
+ */
+@Getter
+public class HostGame {
+    /**
+     * 人物登记
+     */
+    private int level;
+    /**
+     * 装备
+     */
+    private List<String> equipment;
+
+    /**
+     * 开始游戏 新开始
+     */
+    public void newPlay() {
+        this.level = 0;
+        this.equipment = new ArrayList<>();
+    }
+
+    /*
+     *打怪
+     */
+    public String attack() {
+        // 升级
+        level++;
+        return UUID.randomUUID().toString().substring(20,34)+ ":装备衣服 ： level" + (level + 10 - (level % 10) + " 级 - " + ((int)(Math.random()*10 %3)+1) +"⭐品质" );
+    }
+
+    /**
+     * 拾取
+     */
+    public void pickup(String equipment) throws Exception {
+        if (this.equipment.size() >= 30) {
+            throw new Exception("装备背包不足，请购买");
+        }
+        this.equipment.add(equipment);
+    }
+
+    /**
+     * 保存备份
+     */
+    public GameMemento saveGame() {
+        List<String> backup = new LinkedList<>();
+        backup.addAll(this.equipment);
+        return new GameMemento(this.level, backup);
+    }
+
+
+    /**
+     * 加载之前的游戏备份
+     */
+    public void loadGame(GameMemento gameMemento) {
+        this.level = gameMemento.getLevel();
+        this.equipment = gameMemento.getEquipment();
+    }
+
+}

java/com/kongxiang/raindrop/dp/type/behavior/memento/HostGamePlayerMain.java

+package com.kongxiang.raindrop.dp.type.behavior.memento;
+
+/**
+ * @author 孔翔
+ * @since 2023-10-20
+ * copyright for author : 孔翔 at 2023-10-20
+ * dp
+ */
+public class HostGamePlayerMain {
+    public static void main(String[] args) throws Exception {
+        HostGame player = new HostGame();
+        HistoryMemento history = new HistoryMemento();
+        // 新游戏刚入手，开始体验
+        player.newPlay();
+        // 打怪，升级，爆装备
+        String eq = player.attack();
+        // 拾取装备
+        player.pickup(eq);
+        eq = player.attack();
+        player.pickup(eq);
+        System.out.println("高等级极品装备");
+        // 备份
+        GameMemento gameMemento = player.saveGame();
+        history.addHistory(gameMemento);
+        for (int i = 0; i < 23; i++) {
+            System.out.println("打怪升级捡装备");
+            eq = player.attack();
+            player.pickup(eq);
+            // 每五次备份一次
+            if (i % 5 == 0) {
+                // 备份
+                gameMemento = player.saveGame();
+                history.addHistory(gameMemento);
+            }
+        }
+
+
+
+        System.out.println("---------- 当期的玩家数据 ------------");
+        System.out.println(" level:" + player.getLevel() );
+        System.out.println(" 装备列表 :"  );
+        player.getEquipment().forEach(System.out::println);
+        System.out.println("-----------------------------------");
+        System.out.println("查看备份列表");
+        history.list();
+
+        System.out.println("回退到第3个存档，重新打boss");
+        GameMemento gameMemento1 = history.loadHistory(3-1);
+        player.loadGame(gameMemento1);
+
+        System.out.println("---------- 当期的玩家数据 ------------");
+        System.out.println(" level:" + player.getLevel() );
+        System.out.println(" 装备列表 :"  );
+        player.getEquipment().forEach(System.out::println);
+        System.out.println("-----------------------------------");
+
+
+        System.out.println("查看备份列表");
+        history.list();
+
+    }
+}

java/com/kongxiang/raindrop/dp/type/behavior/memento/备忘录模式.puml

+@startuml
+'https://plantuml.com/sequence-diagram
+skinparam linetype ortho
+class Originator {
+    - state;
+    public changeState();
+    public Memento createMemento()
+    public void loadMemento(Memento)
+}
+
+class Memento {
+    - state...;
+    - setState(state);
+    - getState();
+}
+
+class CareTaker {
+    - List<Memento> list ;
+    - save(Memento)
+    - get():Memento
+}
+
+CareTaker o--> Memento
+Originator --> Memento
+
+
+
+
+@enduml
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