diff --git a/day11/src/com/inmind/limit02/Class1.java b/day11/src/com/inmind/limit02/Class1.java
new file mode 100644
index 0000000..d9dddc4
--- /dev/null
+++ b/day11/src/com/inmind/limit02/Class1.java
@@ -0,0 +1,10 @@
+package com.inmind.limit02;
+
+public class Class1  {
+    public static void main(String[] args) {
+        //System.out.println(LimitDemo04.num1);//同一个包中不同类，私有权限不能访问
+        System.out.println(LimitDemo04.num2);
+        System.out.println(LimitDemo04.num3);
+        System.out.println(LimitDemo04.num4);
+    }
+}
diff --git a/day11/src/com/inmind/limit02/LimitDemo04.java b/day11/src/com/inmind/limit02/LimitDemo04.java
new file mode 100644
index 0000000..808a55e
--- /dev/null
+++ b/day11/src/com/inmind/limit02/LimitDemo04.java
@@ -0,0 +1,22 @@
+package com.inmind.limit02;
+/*
+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 LimitDemo04 {
+    static private int num1 = 1;
+    static int num2 = 1;
+    static protected int num3 = 1;
+    static public int num4 = 1;
+
+    public static void main(String[] args) {
+        System.out.println(LimitDemo04.num1);
+        System.out.println(LimitDemo04.num2);
+        System.out.println(LimitDemo04.num3);
+        System.out.println(LimitDemo04.num4);
+    }
+}
diff --git a/day11/src/com/inmind/limit02/sub/Class2.java b/day11/src/com/inmind/limit02/sub/Class2.java
new file mode 100644
index 0000000..6853126
--- /dev/null
+++ b/day11/src/com/inmind/limit02/sub/Class2.java
@@ -0,0 +1,10 @@
+package com.inmind.limit02.sub;
+
+import com.inmind.limit02.LimitDemo04;
+
+public class Class2 extends LimitDemo04 {
+    public static void main(String[] args) {
+        System.out.println(LimitDemo04.num3);//受保护的权限，在不同的包中，只有子类能访问
+        System.out.println(LimitDemo04.num4);
+    }
+}
diff --git a/day11/src/com/inmind/limit02/sub/Class3.java b/day11/src/com/inmind/limit02/sub/Class3.java
new file mode 100644
index 0000000..86cadf5
--- /dev/null
+++ b/day11/src/com/inmind/limit02/sub/Class3.java
@@ -0,0 +1,9 @@
+package com.inmind.limit02.sub;
+
+import com.inmind.limit02.LimitDemo04;
+
+public class Class3 {
+    public static void main(String[] args) {
+        System.out.println(LimitDemo04.num4);//public:不同包，没有任何关系的类，都能访问
+    }
+}