diff --git a/day11/src/com/inmind/final01/Demo01.java b/day11/src/com/inmind/final01/Demo01.java
index c7b6135..469349a 100644
--- a/day11/src/com/inmind/final01/Demo01.java
+++ b/day11/src/com/inmind/final01/Demo01.java
@@ -7,9 +7,13 @@ final的4个用法：
 3.修饰成员变量
 4.修饰局部变量
 -------------------------------------
+1:
 final关键字用于修饰类:该类就不能被继承
 final与abstract是冲突，不能一起使用
 被final修饰的类，叫“太监类”,"最终类"
+
+2:
+final关键字用于修饰方法:该方法就不能被子类重写
  */
 public class Demo01 {
 }
diff --git a/day11/src/com/inmind/final01/Fu.java b/day11/src/com/inmind/final01/Fu.java
index 48acd7e..33f4729 100644
--- a/day11/src/com/inmind/final01/Fu.java
+++ b/day11/src/com/inmind/final01/Fu.java
@@ -1,4 +1,9 @@
 package com.inmind.final01;
 
-public final class Fu {
+public class Fu {
+
+    //假设父类的功能不允许被改变，只能直接使用
+    public final void method(){
+        System.out.println("父类方法");
+    }
 }
diff --git a/day11/src/com/inmind/final01/Zi.java b/day11/src/com/inmind/final01/Zi.java
index c2b7b83..2479fc9 100644
--- a/day11/src/com/inmind/final01/Zi.java
+++ b/day11/src/com/inmind/final01/Zi.java
@@ -1,4 +1,8 @@
 package com.inmind.final01;
 
-public class Zi {
+public class Zi extends Fu{
+    /*@Override
+    public void method() {
+        System.out.println("子类重写父类的方法");
+    }*/
 }