diff --git a/.obsidian/workspace b/.obsidian/workspace
index fd51039..70c9d1e 100644
--- a/.obsidian/workspace
+++ b/.obsidian/workspace
@@ -9,7 +9,7 @@
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           "type": "markdown",
           "state": {
-            "file": "00. Inbox/00. Inbox/A cheatsheet of modern C++ language and library features.md",
+            "file": "03. Programming/Kotlin/class.md",
             "mode": "source",
             "source": true
           }
@@ -40,7 +40,7 @@
             "state": {
               "type": "search",
               "state": {
-                "query": "精確",
+                "query": "kotlin",
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                 "explainSearch": false,
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@@ -69,7 +69,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "00. Inbox/00. Inbox/A cheatsheet of modern C++ language and library features.md",
+                "file": "03. Programming/Kotlin/class.md",
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                 "sortOrder": "alphabetical",
@@ -86,7 +86,7 @@
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-                "file": "00. Inbox/00. Inbox/A cheatsheet of modern C++ language and library features.md"
+                "file": "03. Programming/Kotlin/class.md"
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@@ -116,15 +116,15 @@
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     "01. 個人/02. 專注Study/RxKotlin/20200207 - Study RxKotlin.md",
-    "00. Inbox/03. Mind Map.md",
-    "03. Programming/演算法.md",
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-    "00. Inbox/02.  Kanban TODO - Logitech.md",
-    "00. Inbox/02. Kanban TODO - Me.md",
-    "02. 工作/01. Logitech/Tiny.md"
+    "01. 個人/01. Daily/2021/08/2021-08-16(週一).md",
+    "01. 個人/01. Daily/2021/08/2021-08-14(週六).md",
+    "01. 個人/01. Daily/2021/02/2021-02-22(Mon).md",
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 }
\ No newline at end of file
diff --git a/03. Programming/Kotlin/class.md b/03. Programming/Kotlin/class.md
new file mode 100644
index 0000000..cced2ff
--- /dev/null
+++ b/03. Programming/Kotlin/class.md	
@@ -0,0 +1,11 @@
+Kotlin中的class由class關鍵字開始，一個簡單的class如下：
+class VerySimple {
+
+}
+
+如果需要constructor的話，則在class名稱之後加入所需的參數，如下：
+class VerySimple(para1: Int, para2: String ) {
+
+}
+
+加在constructor中的參數會自動變成class的「成員變數」，如果在參數前面加上private，則會成「私有成員變數」，也就是無法被外部所存取。
\ No newline at end of file