diff --git a/day09/src/com/inmind/extends01/Assissant.java b/day09/src/com/inmind/extends01/Assissant.java
new file mode 100644
index 0000000..531e553
--- /dev/null
+++ b/day09/src/com/inmind/extends01/Assissant.java
@@ -0,0 +1,8 @@
+package com.inmind.extends01;
+
+public class Assissant extends Employee {
+
+    public void help(){
+        System.out.println("助教在帮助学生");
+    }
+}
diff --git a/day09/src/com/inmind/extends01/Banzhuren.java b/day09/src/com/inmind/extends01/Banzhuren.java
new file mode 100644
index 0000000..1fffcd5
--- /dev/null
+++ b/day09/src/com/inmind/extends01/Banzhuren.java
@@ -0,0 +1,7 @@
+package com.inmind.extends01;
+
+public class Banzhuren extends Employee{
+    public void guanxin(){
+        System.out.println(name+"关心学生心理健康");
+    }
+}
diff --git a/day09/src/com/inmind/extends01/Demo01.java b/day09/src/com/inmind/extends01/Demo01.java
new file mode 100644
index 0000000..7a7fd3d
--- /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) {
+        //创建一个老师对象
+        Teacher teacher = new Teacher();
+        teacher.name = "张三";
+        teacher.age = 38;
+        teacher.salary = 15000;
+        teacher.teach();
+        //来一个班主任
+        Banzhuren banzhuren = new Banzhuren();
+        banzhuren.name = "王五";
+        banzhuren.age = 28;
+        banzhuren.salary = 10000;
+        banzhuren.guanxin();
+    }
+}
diff --git a/day09/src/com/inmind/extends01/Employee.java b/day09/src/com/inmind/extends01/Employee.java
new file mode 100644
index 0000000..ddd0b93
--- /dev/null
+++ b/day09/src/com/inmind/extends01/Employee.java
@@ -0,0 +1,12 @@
+package com.inmind.extends01;
+
+public class Employee {
+    String name;
+    int age;
+    double salary;
+    double score;
+
+    public void work(){
+
+    }
+}
diff --git a/day09/src/com/inmind/extends01/Teacher.java b/day09/src/com/inmind/extends01/Teacher.java
new file mode 100644
index 0000000..80fc302
--- /dev/null
+++ b/day09/src/com/inmind/extends01/Teacher.java
@@ -0,0 +1,8 @@
+package com.inmind.extends01;
+
+public class Teacher extends Employee {
+
+    public void teach(){
+        System.out.println(name+"老师正在讲课...");
+    }
+}