add code

code/Design_Pattern/外观模式/Client.java

@@ -0,0 +1,8 @@
+package Design_Pattern.外观模式;
+
+public class Client {
+    public static void main(String[] args) {
+        Facade facade = new Facade();
+        facade.watchMovie();
+    }
+}

code/Design_Pattern/外观模式/Facade.java

@@ -0,0 +1,11 @@
+package Design_Pattern.外观模式;
+
+public class Facade {
+    private SubSystem subSystem = new SubSystem();
+
+    public void watchMovie() {
+        subSystem.turnOnTV();
+        subSystem.setCD("a movie");
+        subSystem.startWatching();
+    }
+}

code/Design_Pattern/外观模式/SubSystem.java

@@ -0,0 +1,15 @@
+package Design_Pattern.外观模式;
+
+public class SubSystem {
+    public void turnOnTV() {
+        System.out.println("turnOnTV()");
+    }
+
+    public void setCD(String cd) {
+        System.out.println("setCD( " + cd + " )");
+    }
+
+    public void startWatching(){
+        System.out.println("startWatching()");
+    }
+}