feature: add lowering coupling discussions and methods.

32.谈谈低耦合原则/.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "iosfwd": "cpp"
+    }
+}

32.谈谈低耦合原则/02.Code/rightcode.cpp

@@ -0,0 +1,41 @@
+#include <iostream>
+
+#define ON  true
+#define OFF false
+
+class Object
+{
+    virtual ~Object(){}
+    virtual void on() = 0;
+    virtual void off() = 0;
+};
+
+class Lamp : public Object
+{
+public:
+    void on() override {
+        // ...
+    }
+    void off() override {
+        // ...
+    }
+};
+
+class Button
+{
+public:
+    Button(Object& obj): mObj(obj){}
+    void touch() {
+        if (mState == ON) {
+            mState = OFF;
+            mObj.off();
+        }
+        else {
+            mState = ON;
+            mObj.on();
+        }
+    }
+private:
+    Object* mObj;
+    bool mState;
+};

32.谈谈低耦合原则/02.Code/wrongcode.cpp

@@ -0,0 +1,34 @@
+#include <iostream>
+
+#define ON  true
+#define OFF false
+
+class Lamp
+{
+public:
+    void on() {
+        // ...
+    }
+    void off() {
+        // ...
+    }
+};
+
+class Button
+{
+public:
+    Button(Lamp& lamp): mLamp(lamp){}
+    void touch() {
+        if (mState == ON) {
+            mState = OFF;
+            mLamp.off();
+        }
+        else {
+            mState = ON;
+            mLamp.on();
+        }
+    }
+private:
+    Lamp& mLamp;
+    bool mState;
+};

README.md

@@ -141,3 +141,8 @@ Jungle设计模式系列
 
 博客地址：https://blog.csdn.net/sinat_21107433/article/details/123150564
 
+32.啊，如何遵循“低耦合”设计原则？
+
+博客地址：https://blog.csdn.net/sinat_21107433/article/details/123160949
+
+