diff --git a/day10/src/com/inmind/interface_poly10/Demo11.java b/day10/src/com/inmind/interface_poly10/Demo11.java
new file mode 100644
index 0000000..a9d63a5
--- /dev/null
+++ b/day10/src/com/inmind/interface_poly10/Demo11.java
@@ -0,0 +1,23 @@
+package com.inmind.interface_poly10;
+/*
+多态的前提：
+1.继承或实现，二选一
+2.要有重写
+3.父类(接口)引用指向子类（实现类）对象
+
+接口的多态：
+父类类型 对象名 = new 子类类型（）；
+接口类型 对象名 = new 该接口的实现类对象();
+ */
+public class Demo11 {
+    public static void main(String[] args) {
+
+        //普通的实现类对象
+        MyInterfaceImpl impl1 = new MyInterfaceImpl();
+        //接口的多态
+        MyInterface impl2 = new MyInterfaceImpl();
+        //多态的口诀：1.父类引用指向子类对象 2.编译看左边，运行看右边
+        impl2.method();
+
+    }
+}
diff --git a/day10/src/com/inmind/interface_poly10/MyInterface.java b/day10/src/com/inmind/interface_poly10/MyInterface.java
new file mode 100644
index 0000000..b286569
--- /dev/null
+++ b/day10/src/com/inmind/interface_poly10/MyInterface.java
@@ -0,0 +1,5 @@
+package com.inmind.interface_poly10;
+
+public interface MyInterface {
+    void method();
+}
diff --git a/day10/src/com/inmind/interface_poly10/MyInterfaceImpl.java b/day10/src/com/inmind/interface_poly10/MyInterfaceImpl.java
new file mode 100644
index 0000000..0ae7600
--- /dev/null
+++ b/day10/src/com/inmind/interface_poly10/MyInterfaceImpl.java
@@ -0,0 +1,12 @@
+package com.inmind.interface_poly10;
+
+public class MyInterfaceImpl implements MyInterface{
+    @Override//标记当前是重写的方法
+    public void method() {
+        System.out.println("实现类重写了抽象方法");
+    }
+
+    public void show(){
+        System.out.println("实现类独有的方法");
+    }
+}