diff --git a/day09/src/com/inmind/extends01/Assistant.java b/day09/src/com/inmind/extends01/Assistant.java
new file mode 100644
index 0000000..b015c78
--- /dev/null
+++ b/day09/src/com/inmind/extends01/Assistant.java
@@ -0,0 +1,5 @@
+package com.inmind.extends01;
+
+public class Assistant extends Employee{
+
+}
diff --git a/day09/src/com/inmind/extends01/BanZhuRen.java b/day09/src/com/inmind/extends01/BanZhuRen.java
new file mode 100644
index 0000000..2c36488
--- /dev/null
+++ b/day09/src/com/inmind/extends01/BanZhuRen.java
@@ -0,0 +1,5 @@
+package com.inmind.extends01;
+
+public class BanZhuRen extends Employee {
+
+}
diff --git a/day09/src/com/inmind/extends01/Demo01.java b/day09/src/com/inmind/extends01/Demo01.java
new file mode 100644
index 0000000..e2675bc
--- /dev/null
+++ b/day09/src/com/inmind/extends01/Demo01.java
@@ -0,0 +1,26 @@
+package com.inmind.extends01;
+/*
+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) {
+        //创建一个班主任对象
+        BanZhuRen bzr = new BanZhuRen();
+        bzr.age = 20;
+        bzr.name = "张三";
+        bzr.salary = 5000.0;
+        bzr.eat();
+
+        Teacher teacher = new Teacher();
+        teacher.age = 20;
+        teacher.name = "张三";
+        teacher.salary = 5000.0;
+        teacher.eat();
+    }
+}
diff --git a/day09/src/com/inmind/extends01/Employee.java b/day09/src/com/inmind/extends01/Employee.java
new file mode 100644
index 0000000..3f8b2cf
--- /dev/null
+++ b/day09/src/com/inmind/extends01/Employee.java
@@ -0,0 +1,11 @@
+package com.inmind.extends01;
+
+public class Employee {
+    String name;
+    int age;
+    double salary;
+
+    public  void eat(){
+        System.out.println("要吃饭");
+    }
+}
diff --git a/day09/src/com/inmind/extends01/Teacher.java b/day09/src/com/inmind/extends01/Teacher.java
new file mode 100644
index 0000000..3899f92
--- /dev/null
+++ b/day09/src/com/inmind/extends01/Teacher.java
@@ -0,0 +1,6 @@
+package com.inmind.extends01;
+
+public class Teacher extends Employee{
+
+
+}