diff --git a/day09/src/com/inmind/extend01/Assistant.java b/day09/src/com/inmind/extend01/Assistant.java
new file mode 100644
index 0000000..23a5fb2
--- /dev/null
+++ b/day09/src/com/inmind/extend01/Assistant.java
@@ -0,0 +1,8 @@
+package com.inmind.extend01;
+
+public class Assistant extends Employee{
+    //特有行为
+    public void help(){
+        System.out.println("年龄为"+age+",姓名为"+name+"帮助学生解决学习和生活上的问题");
+    }
+}
diff --git a/day09/src/com/inmind/extend01/BanZhuRen.java b/day09/src/com/inmind/extend01/BanZhuRen.java
new file mode 100644
index 0000000..f75a0f0
--- /dev/null
+++ b/day09/src/com/inmind/extend01/BanZhuRen.java
@@ -0,0 +1,9 @@
+package com.inmind.extend01;
+
+public class BanZhuRen extends Employee{
+
+    //特有行为
+    public void manage(){
+        System.out.println("管理班级");
+    }
+}
diff --git a/day09/src/com/inmind/extend01/Demo01.java b/day09/src/com/inmind/extend01/Demo01.java
new file mode 100644
index 0000000..fcc45fd
--- /dev/null
+++ b/day09/src/com/inmind/extend01/Demo01.java
@@ -0,0 +1,29 @@
+package com.inmind.extend01;
+/*
+继承：对同一类事物的相同的属性和行为，进行“共性抽取”
+
+继承的格式和和基本使用
+public class Fu{
+}
+public class Zi extends Fu{
+}
+
+继承的特点：子类拥有父类的所有内容，除了被private修饰的和构造方法。
+继承的好处：实现多个类中相同内容的复用,子类可以实现各自的不同功能需求
+
+ */
+public class Demo01 {
+    public static void main(String[] args) {
+        //创建一个老师对象
+        Teacher teacher = new Teacher();
+        teacher.name = "张三";
+        teacher.age = 30;
+        teacher.teach();
+
+        //创建一个辅导员
+        Assistant assistant = new Assistant();
+        assistant.name = "李四";
+        assistant.age = 32;
+        assistant.help();
+    }
+}
diff --git a/day09/src/com/inmind/extend01/Employee.java b/day09/src/com/inmind/extend01/Employee.java
new file mode 100644
index 0000000..86a27c4
--- /dev/null
+++ b/day09/src/com/inmind/extend01/Employee.java
@@ -0,0 +1,7 @@
+package com.inmind.extend01;
+
+public class Employee {
+    //属性
+    String name;
+    int age;
+}
diff --git a/day09/src/com/inmind/extend01/Teacher.java b/day09/src/com/inmind/extend01/Teacher.java
new file mode 100644
index 0000000..f677e6f
--- /dev/null
+++ b/day09/src/com/inmind/extend01/Teacher.java
@@ -0,0 +1,8 @@
+package com.inmind.extend01;
+
+public class Teacher extends Employee {
+    //特有行为
+    public void teach(){
+        System.out.println("年龄为"+age+",姓名为"+name+"老师来教学");
+    }
+}
diff --git a/day09/src/com/inmind/extend01/test/Demo02.java b/day09/src/com/inmind/extend01/test/Demo02.java
new file mode 100644
index 0000000..847f051
--- /dev/null
+++ b/day09/src/com/inmind/extend01/test/Demo02.java
@@ -0,0 +1,14 @@
+package com.inmind.extend01.test;
+/*
+请大家使用继承描述一下，动物类，狗类，猫类，相同的
+属性：name age color
+行为：eat
+
+特有的行为：
+狗看门
+猫抓老鼠
+
+创建猫和狗对象，设置属性，并调用各自的方法
+ */
+public class Demo02 {
+}