diff --git a/.obsidian/workspace b/.obsidian/workspace
index b341c81..a2899d5 100644
--- a/.obsidian/workspace
+++ b/.obsidian/workspace
@@ -9,7 +9,7 @@
         "state": {
           "type": "markdown",
           "state": {
-            "file": "02. PARA/03. Resources（資源）/C++17/lambda.md",
+            "file": "02. PARA/03. Resources（資源）/Design Pattern.md",
             "mode": "source",
             "source": true
           }
@@ -69,7 +69,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "02. PARA/03. Resources（資源）/C++17/lambda.md",
+                "file": "02. PARA/03. Resources（資源）/Design Pattern.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -86,7 +86,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "02. PARA/03. Resources（資源）/C++17/lambda.md"
+                "file": "02. PARA/03. Resources（資源）/Design Pattern.md"
               }
             }
           }
@@ -116,6 +116,7 @@
   },
   "active": "cfe19fa2de06a1e6",
   "lastOpenFiles": [
+    "02. PARA/03. Resources（資源）/Design Pattern.md",
     "02. PARA/03. Resources（資源）/C++17/lambda.md",
     "02. PARA/03. Resources（資源）/C++17/C++17.md",
     "02. PARA/03. Resources（資源）/C++17/以值擷取（captured-by-value）.md",
@@ -124,7 +125,6 @@
     "02. PARA/01. Project（專案）/未命名.md",
     "02. PARA/01. Project（專案）/008. Sentinel.md",
     "02. PARA/03. Resources（資源）/99. templates/front matter.md",
-    "02. PARA/03. Resources（資源）/Obsidian.md",
-    "attachments/Pasted image 20201206094618.png"
+    "02. PARA/03. Resources（資源）/Obsidian.md"
   ]
 }
\ No newline at end of file
diff --git a/02. PARA/03. Resources（資源）/Design Pattern.md b/02. PARA/03. Resources（資源）/Design Pattern.md
index c758793..643c11a 100644
--- a/02. PARA/03. Resources（資源）/Design Pattern.md	
+++ b/02. PARA/03. Resources（資源）/Design Pattern.md	
@@ -131,3 +131,10 @@ class duckWood : public duck {
         ![[Pasted image 20220526183019.png]]
 
 這樣做的另一個好處是fly的初始化是動態的，只要再多一個`set()` function就可以動態的切換實作，也就是說你可以從設定檔來決定你的鴨子要長什麼樣子。
+
+
+## 觀察者模式（Observer Pattern ）
+有一個會產生變動的主角（subject），與一堆需要觀察變動的「觀察者」。觀察者向主角註冊，當主角發生變化的時候，發後通知給觀察者。
+![[20220614154819_Observer_Pattern.png]]
+
+其中
\ No newline at end of file
diff --git a/attachments/20220614154819_Observer_Pattern.png b/attachments/20220614154819_Observer_Pattern.png
new file mode 100644
index 0000000..fe419fc
Binary files /dev/null and b/attachments/20220614154819_Observer_Pattern.png differ