diff --git a/day11/src/com/inmind/limit_05/Class1.java b/day11/src/com/inmind/limit_05/Class1.java
new file mode 100644
index 0000000..915c2ec
--- /dev/null
+++ b/day11/src/com/inmind/limit_05/Class1.java
@@ -0,0 +1,19 @@
+package com.inmind.limit_05;
+/*
+接口中定义5种内容：常量、抽象方法、默认方法、静态方法、私有方法
+选择流程：switch  case   default
+ */
+public class Class1 {
+    //设置4种权限的静态变量
+    private static int num1 = 1;
+    static int num2 = 2;
+    protected static int num3 = 3;
+    public static int num4 = 4;
+
+    public static void method(String[] args) {
+        System.out.println(num1);
+        System.out.println(num2);
+        System.out.println(num3);
+        System.out.println(num4);
+    }
+}
diff --git a/day11/src/com/inmind/limit_05/Class2.java b/day11/src/com/inmind/limit_05/Class2.java
new file mode 100644
index 0000000..b0dbf16
--- /dev/null
+++ b/day11/src/com/inmind/limit_05/Class2.java
@@ -0,0 +1,10 @@
+package com.inmind.limit_05;
+
+public class Class2 {
+    public static void main(String[] args) {
+//        System.out.println(Class1.num1);//同一个包中只有私有内容无法访问
+        System.out.println(Class1.num2);
+        System.out.println(Class1.num3);
+        System.out.println(Class1.num4);
+    }
+}
diff --git a/day11/src/com/inmind/limit_05/Demo04.java b/day11/src/com/inmind/limit_05/Demo04.java
new file mode 100644
index 0000000..103048a
--- /dev/null
+++ b/day11/src/com/inmind/limit_05/Demo04.java
@@ -0,0 +1,12 @@
+package com.inmind.limit_05;
+/*
+四种权限修饰符:权限修饰符，可以用来修饰类，方法，成员变量
+                        public      >       protected       >       (default)       >       private
+在同一个类中              YES                 YES                     YES                     YES
+在同一包中                YES                 YES                     YES                     NO
+在不同包中（父子类关系）    YES                 YES                     NO                      NO
+在不同包中（!父子类关系）   YES                 NO                      NO                      NO
+ */
+public class Demo04 {
+
+}
diff --git a/day11/src/com/inmind/limit_05/sub/Class3.java b/day11/src/com/inmind/limit_05/sub/Class3.java
new file mode 100644
index 0000000..a7c35a9
--- /dev/null
+++ b/day11/src/com/inmind/limit_05/sub/Class3.java
@@ -0,0 +1,13 @@
+package com.inmind.limit_05.sub;
+
+import com.inmind.limit_05.Class1;
+
+public class Class3 extends Class1 {
+    public static void main(String[] args) {
+        //注意：在不同包，有父子关系类中，只有public protected可以访问
+        /*System.out.println(Class1.num1);
+        System.out.println(Class1.num2);*/
+        System.out.println(Class1.num3);
+        System.out.println(Class1.num4);
+    }
+}
diff --git a/day11/src/com/inmind/limit_05/sub/Class4.java b/day11/src/com/inmind/limit_05/sub/Class4.java
new file mode 100644
index 0000000..7662925
--- /dev/null
+++ b/day11/src/com/inmind/limit_05/sub/Class4.java
@@ -0,0 +1,13 @@
+package com.inmind.limit_05.sub;
+
+import com.inmind.limit_05.Class1;
+
+public class Class4 {
+    public static void main(String[] args) {
+        //注意：在不同包，没有父子关系类中，只有public 可以访问
+        /*System.out.println(Class1.num1);
+        System.out.println(Class1.num2);
+        System.out.println(Class1.num3);*/
+        System.out.println(Class1.num4);
+    }
+}