diff --git a/DesignPatterns/Behavioral/NullObjectPattern/DaisyMae.php b/DesignPatterns/Behavioral/NullObjectPattern/DaisyMae.php
new file mode 100644
index 0000000..a0d9775
--- /dev/null
+++ b/DesignPatterns/Behavioral/NullObjectPattern/DaisyMae.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace DesignPatterns\Behavioral\NullObjectPattern;
+
+/**
+ * Class DaisyMae.
+ */
+class DaisyMae implements NPC
+{
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function buyTurnips(int $price, int $count)
+    {
+        echo "[曹賣] 今天的價格是 1 棵 $price 鈴錢，要現在買嗎？";
+    }
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function sellTurnips(int $price, int $count)
+    {
+        echo "[曹賣] 我是曹賣，你不能把大頭菜賣給我。";
+    }
+}
diff --git a/DesignPatterns/Behavioral/NullObjectPattern/Mamekichi.php b/DesignPatterns/Behavioral/NullObjectPattern/Mamekichi.php
new file mode 100644
index 0000000..edf0bec
--- /dev/null
+++ b/DesignPatterns/Behavioral/NullObjectPattern/Mamekichi.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace DesignPatterns\Behavioral\NullObjectPattern;
+
+/**
+ * Class Mamekichi.
+ */
+class Mamekichi implements NPC
+{
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function buyTurnips(int $price, int $count)
+    {
+        echo "[豆狸] 我是豆狸，我沒有在賣大頭菜狸。";
+        echo "[粒狸] 沒有在賣。";
+    }
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function sellTurnips(int $price, int $count)
+    {
+        $total = $price * $count;
+        echo "[豆狸] 現在的大頭菜價格是 1 棵 $price 鈴錢！";
+        echo "[粒狸] 鈴錢！";
+        echo "[豆狸] 好了！那麼，一共是 $total 鈴錢，確定要賣掉嗎？";
+        echo "[粒狸] 賣掉嗎？";
+    }
+}
diff --git a/DesignPatterns/Behavioral/NullObjectPattern/NPC.php b/DesignPatterns/Behavioral/NullObjectPattern/NPC.php
new file mode 100644
index 0000000..17dc6e0
--- /dev/null
+++ b/DesignPatterns/Behavioral/NullObjectPattern/NPC.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace DesignPatterns\Behavioral\NullObjectPattern;
+
+/**
+ * Interface NPC.
+ */
+interface NPC
+{
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function buyTurnips(int $price, int $count);
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function sellTurnips(int $price, int $count);
+}
diff --git a/DesignPatterns/Behavioral/NullObjectPattern/Player.php b/DesignPatterns/Behavioral/NullObjectPattern/Player.php
new file mode 100644
index 0000000..4641a56
--- /dev/null
+++ b/DesignPatterns/Behavioral/NullObjectPattern/Player.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace DesignPatterns\Behavioral\NullObjectPattern;
+
+/**
+ * Class Player
+ */
+class Player
+{
+    /**
+     * @var NPC
+     */
+    protected NPC $npc;
+
+    /**
+     * 
+     * @param NPC $npc
+     */
+    public function __construct(NPC $npc)
+    {
+        $this->setNPC($npc);
+    }
+
+    /**
+     * @param NPC $npc
+     */
+    public function setNPC(NPC $npc)
+    {
+        $this->npc = $npc;
+    }
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function buy(int $price, int $count)
+    {
+        $this->npc->buyTurnips($price, $count);
+    }
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function sell(int $price, int $count)
+    {
+        $this->npc->sellTurnips($price, $count);
+    }
+}
diff --git a/DesignPatterns/Behavioral/NullObjectPattern/README.md b/DesignPatterns/Behavioral/NullObjectPattern/README.md
index fd4c1a0..d8d5018 100644
--- a/DesignPatterns/Behavioral/NullObjectPattern/README.md
+++ b/DesignPatterns/Behavioral/NullObjectPattern/README.md
@@ -1,15 +1,273 @@
 ![Banner](https://raw.githubusercontent.com/Kantai235/php-design-pattern/master/DesignPatterns/Behavioral/NullObjectPattern/Banner.png)
 
 # 空物件模式 Null Object Pattern
+空物件模式，一種以非 Null 的空白物件去取代 Null 的模式，其空白物件並不是拿來比對資料是否為 Null，而是讓原本應該做些事情的物件，因為空白物件而不做任何事，或是去執行預設的動作，打個比喻來說，遊戲裡面購買、販賣大頭菜是要找不同 NPC 的，如果要購買大頭菜，那就必須找曹賣(Daisy Mae)來購買，如果要販賣大頭菜則是找豆狸粒狸(Mamekichi and Tsubukichi)來販賣。
 
 ## UML
 ![UML](https://raw.githubusercontent.com/Kantai235/php-design-pattern/master/DesignPatterns/Behavioral/NullObjectPattern/UML.png)
 
 ## 實作
+玩家要購買、販賣大頭菜會跟 NPC 進行這些動作，所以我們要先定義 NPC 所能提供的功能有哪些，因此會有購買大頭菜、販賣大頭菜這兩個方法被定義出來，如果繼承了 NPC 這個介面就要去實作這兩個方法。
 
+NPC.php
+```php
+/**
+ * Interface NPC.
+ */
+interface NPC
+{
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function buyTurnips(int $price, int $count);
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function sellTurnips(int $price, int $count);
+}
+```
+
+接下來實作曹賣(Daisy Mae)，但曹賣本身就只能購買大頭菜，因此在購買大頭菜的方法上實作這件事，但在販賣大頭菜的部分則是可以撰寫些對應的處理流程，這邊舉例為曹賣的貼心告知。
+
+DaisyMae.php
+```php
+/**
+ * Class DaisyMae.
+ */
+class DaisyMae implements NPC
+{
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function buyTurnips(int $price, int $count)
+    {
+        echo "[曹賣] 今天的價格是 1 棵 $price 鈴錢，要現在買嗎？";
+    }
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function sellTurnips(int $price, int $count)
+    {
+        echo "[曹賣] 我是曹賣，你不能把大頭菜賣給我。";
+    }
+}
+```
+
+曹賣(DaisyMae)是負責提供玩家可以購買大頭菜的重要 NPC，因此接下來要撰寫豆狸(Mamekichi)以及粒狸(Tsubukichi)兩位負責提供玩家販賣大頭菜的重要 NPC。
+
+Mamekichi.php
+```php
+/**
+ * Class Mamekichi.
+ */
+class Mamekichi implements NPC
+{
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function buyTurnips(int $price, int $count)
+    {
+        echo "[豆狸] 我是豆狸，我沒有在賣大頭菜狸。";
+        echo "[粒狸] 沒有在賣。";
+    }
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function sellTurnips(int $price, int $count)
+    {
+        $total = $price * $count;
+        echo "[豆狸] 現在的大頭菜價格是 1 棵 $price 鈴錢！";
+        echo "[粒狸] 鈴錢！";
+        echo "[豆狸] 好了！那麼，一共是 $total 鈴錢，確定要賣掉嗎？";
+        echo "[粒狸] 賣掉嗎？";
+    }
+}
+```
+
+Tsubukichi.php
+```php
+/**
+ * Class Tsubukichi.
+ */
+class Tsubukichi implements NPC
+{
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function buyTurnips(int $price, int $count)
+    {
+        echo "[粒狸] 我是粒狸，我沒有在賣大頭菜狸。";
+        echo "[豆狸] 沒有在賣。";
+    }
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function sellTurnips(int $price, int $count)
+    {
+        $total = $price * $count;
+        echo "[粒狸] 現在的大頭菜價格是 1 棵 $price 鈴錢！";
+        echo "[豆狸] 鈴錢！";
+        echo "[粒狸] 好了！那麼，一共是 $total 鈴錢，確定要賣掉嗎？";
+        echo "[豆狸] 賣掉嗎？";
+    }
+}
+```
+
+最後我們要模擬玩家(Player)出來，並且帶入當前目標 NPC 物件，假想為玩家目前正在對話的目標，並且有兩個行為，分別是購買大頭菜、販賣大頭菜的動作。
+
+Player.php
+```php
+/**
+ * Class Player
+ */
+class Player
+{
+    /**
+     * @var NPC
+     */
+    protected NPC $npc;
+
+    /**
+     * 
+     * @param NPC $npc
+     */
+    public function __construct(NPC $npc)
+    {
+        $this->setNPC($npc);
+    }
+
+    /**
+     * @param NPC $npc
+     */
+    public function setNPC(NPC $npc)
+    {
+        $this->npc = $npc;
+    }
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function buy(int $price, int $count)
+    {
+        $this->npc->buyTurnips($price, $count);
+    }
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function sell(int $price, int $count)
+    {
+        $this->npc->sellTurnips($price, $count);
+    }
+}
+```
 
 ## 測試
+最後我們要測試空物件模式的幾個需要做的事情，首先是測試在無法提供特定功能下，其物件是否會執行預設給予的行為動作，像是曹賣僅提供購買大頭菜的功能，但不提供販賣大頭菜的功能，如果玩家對曹賣執行販賣大頭菜的功能，那麼曹賣會告訴玩家這項動作無法執行。
+1. 測試曹賣執行購買、販賣大頭菜的動作。
+2. 測試豆狸執行購買、販賣大頭菜的動作。
+3. 測試粒狸執行購買、販賣大頭菜的動作。
+4. 測試對曹賣購買大頭菜，並切換 NPC 目標，向豆狸、粒狸販賣大頭菜。
+
+NullObjectPatternTest.php
+```php
+/**
+ * Class NullObjectPatternTest.
+ */
+class NullObjectPatternTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function test_daisy_mas()
+    {
+        $this->expectOutputString(implode(array(
+            "[曹賣] 今天的價格是 1 棵 100 鈴錢，要現在買嗎？",
+            "[曹賣] 我是曹賣，你不能把大頭菜賣給我。",
+        )));
+        
+        $player = new Player(new DaisyMae());
+        $player->buy(100, 40);
+        $player->sell(200, 40);
+    }
 
+    /**
+     * @test
+     */
+    public function test_mamekichi()
+    {
+        $this->expectOutputString(implode(array(
+            "[豆狸] 我是豆狸，我沒有在賣大頭菜狸。",
+            "[粒狸] 沒有在賣。",
+            "[豆狸] 現在的大頭菜價格是 1 棵 200 鈴錢！",
+            "[粒狸] 鈴錢！",
+            "[豆狸] 好了！那麼，一共是 8000 鈴錢，確定要賣掉嗎？[粒狸] 賣掉嗎？",
+        )));
+
+        $player = new Player(new Mamekichi());
+        $player->buy(100, 40);
+        $player->sell(200, 40);
+    }
+
+    /**
+     * @test
+     */
+    public function test_tsubukichi()
+    {
+        $this->expectOutputString(implode(array(
+            "[粒狸] 我是粒狸，我沒有在賣大頭菜狸。",
+            "[豆狸] 沒有在賣。",
+            "[粒狸] 現在的大頭菜價格是 1 棵 200 鈴錢！",
+            "[豆狸] 鈴錢！",
+            "[粒狸] 好了！那麼，一共是 8000 鈴錢，確定要賣掉嗎？",
+            "[豆狸] 賣掉嗎？",
+        )));
+
+        $player = new Player(new Tsubukichi());
+        $player->buy(100, 40);
+        $player->sell(200, 40);
+    }
+
+    /**
+     * @test
+     */
+    public function test_daisy_mas_buy_and_mamekichi_and_tsubukichi()
+    {
+        $this->expectOutputString(implode(array(
+            "[曹賣] 今天的價格是 1 棵 100 鈴錢，要現在買嗎？",
+            "[豆狸] 現在的大頭菜價格是 1 棵 200 鈴錢！",
+            "[粒狸] 鈴錢！",
+            "[豆狸] 好了！那麼，一共是 4000 鈴錢，確定要賣掉嗎？",
+            "[粒狸] 賣掉嗎？",
+            "[粒狸] 現在的大頭菜價格是 1 棵 300 鈴錢！",
+            "[豆狸] 鈴錢！",
+            "[粒狸] 好了！那麼，一共是 6000 鈴錢，確定要賣掉嗎？",
+            "[豆狸] 賣掉嗎？",
+        )));
+
+        $player = new Player(new DaisyMae());
+        $player->buy(100, 40);
+        $player->setNPC(new Mamekichi());
+        $player->sell(200, 20);
+        $player->setNPC(new Tsubukichi());
+        $player->sell(300, 20);
+    }
+}
+```
 
 最後測試的執行結果會獲得如下：
 
@@ -20,6 +278,12 @@ PHPUnit Pretty Result Printer 0.28.0 by Codedungeon and contributors.
 PHPUnit 9.2.6 by Sebastian Bergmann and contributors.
 
 
+ ==> ...fResponsibilitiesTest   ✔  ✔  ✔  
+ ==> CommandPatternTest         ✔  
+ ==> IteratorPatternTest        ✔  ✔  ✔  ✔  
+ ==> MediatorPatternTest        ✔  ✔  ✔  
+ ==> MementoPatternTest         ✔  
+ ==> NullObjectPatternTest      ✔  ✔  ✔  ✔  
  ==> AbstractFactoryTest        ✔  ✔  ✔  ✔  
  ==> BuilderPatternTest         ✔  ✔  ✔  ✔  
  ==> FactoryMethodTest          ✔  ✔  ✔  ✔  
@@ -40,9 +304,9 @@ PHPUnit 9.2.6 by Sebastian Bergmann and contributors.
  ==> ProxyPatternTest           ✔  ✔  
  ==> RegistryPatternTest        ✔  ✔  ✔  ✔  ✔  
 
-Time: 00:00.037, Memory: 6.00 MB
+Time: 00:00.042, Memory: 8.00 MB
 
-OK (51 tests, 116 assertions)
+OK (67 tests, 136 assertions)
 ```
 
 ## 完整程式碼
diff --git a/DesignPatterns/Behavioral/NullObjectPattern/Tsubukichi.php b/DesignPatterns/Behavioral/NullObjectPattern/Tsubukichi.php
new file mode 100644
index 0000000..da16402
--- /dev/null
+++ b/DesignPatterns/Behavioral/NullObjectPattern/Tsubukichi.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace DesignPatterns\Behavioral\NullObjectPattern;
+
+/**
+ * Class Tsubukichi.
+ */
+class Tsubukichi implements NPC
+{
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function buyTurnips(int $price, int $count)
+    {
+        echo "[粒狸] 我是粒狸，我沒有在賣大頭菜狸。";
+        echo "[豆狸] 沒有在賣。";
+    }
+
+    /**
+     * @param int $price
+     * @param int $count
+     */
+    public function sellTurnips(int $price, int $count)
+    {
+        $total = $price * $count;
+        echo "[粒狸] 現在的大頭菜價格是 1 棵 $price 鈴錢！";
+        echo "[豆狸] 鈴錢！";
+        echo "[粒狸] 好了！那麼，一共是 $total 鈴錢，確定要賣掉嗎？";
+        echo "[豆狸] 賣掉嗎？";
+    }
+}
diff --git a/DesignPatterns/Behavioral/NullObjectPattern/UML.png b/DesignPatterns/Behavioral/NullObjectPattern/UML.png
new file mode 100644
index 0000000..ad2eee9
Binary files /dev/null and b/DesignPatterns/Behavioral/NullObjectPattern/UML.png differ
diff --git a/DesignPatterns/Behavioral/README.md b/DesignPatterns/Behavioral/README.md
index 6291eb0..a7dc369 100644
--- a/DesignPatterns/Behavioral/README.md
+++ b/DesignPatterns/Behavioral/README.md
@@ -16,7 +16,7 @@
 備忘錄模式，在不破壞封裝物件的前提之下，提供物件一個「皇后殺手 第三爆彈：敗者成塵」的能力，物件在極度絕望的狀態下，把當前物件炸光光，並令時間往前倒退至上一個時空紀錄點的設計模式，跟吉良吉影的不同點在於命運會跟著被改變，被破壞的東西會恢復原狀。
 
 ## [空物件模式 Null Object Pattern](/DesignPatterns/Behavioral/NullObjectPattern)
-
+空物件模式，一種以非 Null 的空白物件去取代 Null 的模式，其空白物件並不是拿來比對資料是否為 Null，而是讓原本應該做些事情的物件，因為空白物件而不做任何事，或是去執行預設的動作，打個比喻來說，遊戲裡面購買、販賣大頭菜是要找不同 NPC 的，如果要購買大頭菜，那就必須找曹賣(Daisy Mae)來購買，如果要販賣大頭菜則是找豆狸粒狸(Mamekichi and Tsubukichi)來販賣。
 
 ## [觀察者模式 Observer Pattern](/DesignPatterns/Behavioral/ObserverPattern)
 
diff --git a/Tests/Behavioral/NullObjectPatternTest.php b/Tests/Behavioral/NullObjectPatternTest.php
new file mode 100644
index 0000000..200b15c
--- /dev/null
+++ b/Tests/Behavioral/NullObjectPatternTest.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace Tests\Behavioral;
+
+use DesignPatterns\Behavioral\NullObjectPattern\DaisyMae;
+use DesignPatterns\Behavioral\NullObjectPattern\Mamekichi;
+use DesignPatterns\Behavioral\NullObjectPattern\Player;
+use DesignPatterns\Behavioral\NullObjectPattern\Tsubukichi;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Class NullObjectPatternTest.
+ */
+class NullObjectPatternTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function test_daisy_mas()
+    {
+        $this->expectOutputString(implode(array(
+            "[曹賣] 今天的價格是 1 棵 100 鈴錢，要現在買嗎？",
+            "[曹賣] 我是曹賣，你不能把大頭菜賣給我。",
+        )));
+        
+        $player = new Player(new DaisyMae());
+        $player->buy(100, 40);
+        $player->sell(200, 40);
+    }
+
+    /**
+     * @test
+     */
+    public function test_mamekichi()
+    {
+        $this->expectOutputString(implode(array(
+            "[豆狸] 我是豆狸，我沒有在賣大頭菜狸。",
+            "[粒狸] 沒有在賣。",
+            "[豆狸] 現在的大頭菜價格是 1 棵 200 鈴錢！",
+            "[粒狸] 鈴錢！",
+            "[豆狸] 好了！那麼，一共是 8000 鈴錢，確定要賣掉嗎？[粒狸] 賣掉嗎？",
+        )));
+
+        $player = new Player(new Mamekichi());
+        $player->buy(100, 40);
+        $player->sell(200, 40);
+    }
+
+    /**
+     * @test
+     */
+    public function test_tsubukichi()
+    {
+        $this->expectOutputString(implode(array(
+            "[粒狸] 我是粒狸，我沒有在賣大頭菜狸。",
+            "[豆狸] 沒有在賣。",
+            "[粒狸] 現在的大頭菜價格是 1 棵 200 鈴錢！",
+            "[豆狸] 鈴錢！",
+            "[粒狸] 好了！那麼，一共是 8000 鈴錢，確定要賣掉嗎？",
+            "[豆狸] 賣掉嗎？",
+        )));
+
+        $player = new Player(new Tsubukichi());
+        $player->buy(100, 40);
+        $player->sell(200, 40);
+    }
+
+    /**
+     * @test
+     */
+    public function test_daisy_mas_buy_and_mamekichi_and_tsubukichi()
+    {
+        $this->expectOutputString(implode(array(
+            "[曹賣] 今天的價格是 1 棵 100 鈴錢，要現在買嗎？",
+            "[豆狸] 現在的大頭菜價格是 1 棵 200 鈴錢！",
+            "[粒狸] 鈴錢！",
+            "[豆狸] 好了！那麼，一共是 4000 鈴錢，確定要賣掉嗎？",
+            "[粒狸] 賣掉嗎？",
+            "[粒狸] 現在的大頭菜價格是 1 棵 300 鈴錢！",
+            "[豆狸] 鈴錢！",
+            "[粒狸] 好了！那麼，一共是 6000 鈴錢，確定要賣掉嗎？",
+            "[豆狸] 賣掉嗎？",
+        )));
+
+        $player = new Player(new DaisyMae());
+        $player->buy(100, 40);
+        $player->setNPC(new Mamekichi());
+        $player->sell(200, 20);
+        $player->setNPC(new Tsubukichi());
+        $player->sell(300, 20);
+    }
+}
diff --git a/UML.mdj b/UML.mdj
index bde2924..83decff 100644
--- a/UML.mdj
+++ b/UML.mdj
@@ -37338,6 +37338,1854 @@
 							]
 						}
 					]
+				},
+				{
+					"_type": "UMLModel",
+					"_id": "AAAAAAF0tUZj6+gx2BI=",
+					"_parent": {
+						"$ref": "AAAAAAF0EEBPZ8wNRnw="
+					},
+					"name": "空物件模式 Null Object Pattern",
+					"ownedElements": [
+						{
+							"_type": "UMLClassDiagram",
+							"_id": "AAAAAAF0tUZj6+gySwQ=",
+							"_parent": {
+								"$ref": "AAAAAAF0tUZj6+gx2BI="
+							},
+							"name": "空物件模式 Null Object Pattern",
+							"ownedViews": [
+								{
+									"_type": "UMLClassView",
+									"_id": "AAAAAAF0tUbirekzxlQ=",
+									"_parent": {
+										"$ref": "AAAAAAF0tUZj6+gySwQ="
+									},
+									"model": {
+										"$ref": "AAAAAAF0tUbirekxNXk="
+									},
+									"subViews": [
+										{
+											"_type": "UMLNameCompartmentView",
+											"_id": "AAAAAAF0tUbirek0nWI=",
+											"_parent": {
+												"$ref": "AAAAAAF0tUbirekzxlQ="
+											},
+											"model": {
+												"$ref": "AAAAAAF0tUbirekxNXk="
+											},
+											"subViews": [
+												{
+													"_type": "LabelView",
+													"_id": "AAAAAAF0tUbirek1mtI=",
+													"_parent": {
+														"$ref": "AAAAAAF0tUbirek0nWI="
+													},
+													"font": "Courier New;24;0",
+													"left": 133,
+													"top": 261,
+													"width": 547.2890625,
+													"height": 24,
+													"text": "«interface»"
+												},
+												{
+													"_type": "LabelView",
+													"_id": "AAAAAAF0tUbirek2KaE=",
+													"_parent": {
+														"$ref": "AAAAAAF0tUbirek0nWI="
+													},
+													"font": "Courier New;24;1",
+													"left": 133,
+													"top": 287,
+													"width": 547.2890625,
+													"height": 24,
+													"text": "NPC"
+												},
+												{
+													"_type": "LabelView",
+													"_id": "AAAAAAF0tUbirek3QIo=",
+													"_parent": {
+														"$ref": "AAAAAAF0tUbirek0nWI="
+													},
+													"visible": false,
+													"font": "Courier New;24;0",
+													"left": -400,
+													"top": -656,
+													"width": 508.86328125,
+													"height": 24,
+													"text": "(from 空物件模式 Null Object Pattern)"
+												},
+												{
+													"_type": "LabelView",
+													"_id": "AAAAAAF0tUbirek4Xig=",
+													"_parent": {
+														"$ref": "AAAAAAF0tUbirek0nWI="
+													},
+													"visible": false,
+													"font": "Courier New;24;0",
+													"left": -400,
+													"top": -656,
+													"height": 24,
+													"horizontalAlignment": 1
+												}
+											],
+											"font": "Courier New;24;0",
+											"left": 128,
+											"top": 256,
+											"width": 557.2890625,
+											"height": 60,
+											"stereotypeLabel": {
+												"$ref": "AAAAAAF0tUbirek1mtI="
+											},
+											"nameLabel": {
+												"$ref": "AAAAAAF0tUbirek2KaE="
+											},
+											"namespaceLabel": {
+												"$ref": "AAAAAAF0tUbirek3QIo="
+											},
+											"propertyLabel": {
+												"$ref": "AAAAAAF0tUbirek4Xig="
+											}
+										},
+										{
+											"_type": "UMLAttributeCompartmentView",
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+											"_parent": {
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+											"model": {
+												"$ref": "AAAAAAF0tUbirekxNXk="
+											},
+											"font": "Courier New;24;0",
+											"left": 128,
+											"top": 316,
+											"width": 557.2890625,
+											"height": 10
+										},
+										{
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+											"_id": "AAAAAAF0tUbirek69kI=",
+											"_parent": {
+												"$ref": "AAAAAAF0tUbirekzxlQ="
+											},
+											"model": {
+												"$ref": "AAAAAAF0tUbirekxNXk="
+											},
+											"subViews": [
+												{
+													"_type": "UMLOperationView",
+													"_id": "AAAAAAF0tUca2ulg38k=",
+													"_parent": {
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+													},
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+													"left": 133,
+													"top": 331,
+													"width": 547.2890625,
+													"height": 24,
+													"text": "+buyTurnips($price: int, $count: int)",
+													"horizontalAlignment": 0
+												},
+												{
+													"_type": "UMLOperationView",
+													"_id": "AAAAAAF0tUchIulm7SM=",
+													"_parent": {
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+													"left": 133,
+													"top": 357,
+													"width": 547.2890625,
+													"height": 24,
+													"text": "+sellTurnips($price: int, $count: int)",
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+											"font": "Courier New;24;0",
+											"left": 128,
+											"top": 326,
+											"width": 557.2890625,
+											"height": 60
+										},
+										{
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+											"_parent": {
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+											"width": 10,
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+										},
+										{
+											"_type": "UMLTemplateParameterCompartmentView",
+											"_id": "AAAAAAF0tUbirek8hbA=",
+											"_parent": {
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+											"width": 10,
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+										}
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+									"font": "Courier New;24;0",
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+									"left": 128,
+									"top": 256,
+									"width": 557.2890625,
+									"height": 130,
+									"nameCompartment": {
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+									"attributeCompartment": {
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+									},
+									"operationCompartment": {
+										"$ref": "AAAAAAF0tUbirek69kI="
+									},
+									"receptionCompartment": {
+										"$ref": "AAAAAAF0tUbirek70oc="
+									},
+									"templateParameterCompartment": {
+										"$ref": "AAAAAAF0tUbirek8hbA="
+									}
+								},
+								{
+									"_type": "UMLClassView",
+									"_id": "AAAAAAF0tUeUm+l3E3Q=",
+									"_parent": {
+										"$ref": "AAAAAAF0tUZj6+gySwQ="
+									},
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+										"$ref": "AAAAAAF0tUeUmul1sjI="
+									},
+									"subViews": [
+										{
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+											"_parent": {
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+											},
+											"model": {
+												"$ref": "AAAAAAF0tUeUmul1sjI="
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+											"subViews": [
+												{
+													"_type": "LabelView",
+													"_id": "AAAAAAF0tUeUm+l5j80=",
+													"_parent": {
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+													"top": 111,
+													"width": 547.2890625,
+													"height": 24,
+													"text": "DaisyMae"
+												},
+												{
+													"_type": "LabelView",
+													"_id": "AAAAAAF0tUeUm+l7ZyE=",
+													"_parent": {
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+													"top": -1342,
+													"width": 508.86328125,
+													"height": 24,
+													"text": "(from 空物件模式 Null Object Pattern)"
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+												{
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+											"_parent": {
+												"$ref": "AAAAAAF0tUjzk+qu78g="
+											},
+											"name": "$price",
+											"type": "int"
+										},
+										{
+											"_type": "UMLParameter",
+											"_id": "AAAAAAF0tUlEM+q//Js=",
+											"_parent": {
+												"$ref": "AAAAAAF0tUjzk+qu78g="
+											},
+											"name": "$count",
+											"type": "int"
+										}
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+								},
+								{
+									"_type": "UMLOperation",
+									"_id": "AAAAAAF0tUj+req0Nn0=",
+									"_parent": {
+										"$ref": "AAAAAAF0tUhrVupuHBY="
+									},
+									"name": "sell",
+									"parameters": [
+										{
+											"_type": "UMLParameter",
+											"_id": "AAAAAAF0tUlVkerD43s=",
+											"_parent": {
+												"$ref": "AAAAAAF0tUj+req0Nn0="
+											},
+											"name": "$price",
+											"type": "int"
+										},
+										{
+											"_type": "UMLParameter",
+											"_id": "AAAAAAF0tUlVkurEpQ0=",
+											"_parent": {
+												"$ref": "AAAAAAF0tUj+req0Nn0="
+											},
+											"name": "$count",
+											"type": "int"
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 				}
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 		}