diff --git a/day09/src/com/inmind/extends_override03/test/Demo05.java b/day09/src/com/inmind/extends_override03/test/Demo05.java
new file mode 100644
index 0000000..5c89e2d
--- /dev/null
+++ b/day09/src/com/inmind/extends_override03/test/Demo05.java
@@ -0,0 +1,22 @@
+package com.inmind.extends_override03.test;
+
+import java.awt.print.PrinterJob;
+
+/*
+重写的应用案例
+ */
+public class Demo05 {
+    public static void main(String[] args) {
+        //创建一个旧手机
+        Phone phone = new Phone();
+        phone.call();
+        phone.send();
+        phone.showNumber();
+
+        //创建一个新手机
+        NewPhone newPhone = new NewPhone();
+        newPhone.call();
+        newPhone.send();
+        newPhone.showNumber();
+    }
+}
diff --git a/day09/src/com/inmind/extends_override03/test/NewPhone.java b/day09/src/com/inmind/extends_override03/test/NewPhone.java
new file mode 100644
index 0000000..2bdec8d
--- /dev/null
+++ b/day09/src/com/inmind/extends_override03/test/NewPhone.java
@@ -0,0 +1,14 @@
+package com.inmind.extends_override03.test;
+
+public class NewPhone extends Phone{
+    //对原本的功能call()send()进行了沿用
+
+    //对原本的来电显示要扩展新的功能
+    @Override
+    public void showNumber(){
+        //要求：显示电话号码要沿用，扩展显示头像和归属地
+        super.showNumber();
+        System.out.println("显示头像");
+        System.out.println("显示归属地");
+    }
+}
diff --git a/day09/src/com/inmind/extends_override03/test/Phone.java b/day09/src/com/inmind/extends_override03/test/Phone.java
new file mode 100644
index 0000000..befa821
--- /dev/null
+++ b/day09/src/com/inmind/extends_override03/test/Phone.java
@@ -0,0 +1,15 @@
+package com.inmind.extends_override03.test;
+
+public class Phone {
+    public void call(){
+        System.out.println("打电话");
+    }
+
+    public void send(){
+        System.out.println("发短信");
+    }
+
+    public void showNumber(){
+        System.out.println("显示电话号码");
+    }
+}