diff --git a/day10/src/com/inmind/poly08/Animal.java b/day10/src/com/inmind/poly08/Animal.java
new file mode 100644
index 0000000..de88280
--- /dev/null
+++ b/day10/src/com/inmind/poly08/Animal.java
@@ -0,0 +1,8 @@
+package com.inmind.poly08;
+
+public class Animal {
+
+    public void run(){
+        System.out.println("动物跑");
+    }
+}
diff --git a/day10/src/com/inmind/poly08/Cat.java b/day10/src/com/inmind/poly08/Cat.java
new file mode 100644
index 0000000..5448b16
--- /dev/null
+++ b/day10/src/com/inmind/poly08/Cat.java
@@ -0,0 +1,8 @@
+package com.inmind.poly08;
+
+public class Cat extends Animal{
+    @Override
+    public void run() {
+        System.out.println("猫闪着跑，闪身步");
+    }
+}
diff --git a/day10/src/com/inmind/poly08/Demo08.java b/day10/src/com/inmind/poly08/Demo08.java
new file mode 100644
index 0000000..c34adf6
--- /dev/null
+++ b/day10/src/com/inmind/poly08/Demo08.java
@@ -0,0 +1,22 @@
+package com.inmind.poly08;
+/*
+多态的格式和使用
+
+多态的前提：【重点】
+继承或者实现【二选一】
+方法的重写【意义体现：不重写，无意义】
+父类引用指向子类对象【格式体现】
+ */
+public class Demo08 {
+    public static void main(String[] args) {
+        //普通的面向对象的写法
+        Dog dog = new Dog();
+        Cat cat = new Cat();
+        //多态写法：父类引用指向子类对象
+        Animal animal1 = new Dog();
+        Animal animal2 = new Cat();
+
+        animal1.run();
+        animal2.run();
+    }
+}
diff --git a/day10/src/com/inmind/poly08/Dog.java b/day10/src/com/inmind/poly08/Dog.java
new file mode 100644
index 0000000..cbe937a
--- /dev/null
+++ b/day10/src/com/inmind/poly08/Dog.java
@@ -0,0 +1,8 @@
+package com.inmind.poly08;
+
+public class Dog extends Animal{
+    @Override
+    public void run() {
+        System.out.println("狗哆嗦地跑");
+    }
+}