diff --git a/day09/src/com/inmind/abstract06/test/Demo09.java b/day09/src/com/inmind/abstract06/test/Demo09.java
index c2b0323..0d28fdc 100644
--- a/day09/src/com/inmind/abstract06/test/Demo09.java
+++ b/day09/src/com/inmind/abstract06/test/Demo09.java
@@ -24,5 +24,8 @@ public class Demo09 {
         System.out.println("圆形的周长："+circle.getZC());
 
         //如何快速定义出一个正方型的类，还不用自己实现周长和面积的方法
+        Square square = new Square(2);
+        System.out.println("正方形形的面积："+square.getArea());
+        System.out.println("正方形形的周长："+square.getZC());
     }
 }
diff --git a/day09/src/com/inmind/abstract06/test/Square.java b/day09/src/com/inmind/abstract06/test/Square.java
new file mode 100644
index 0000000..54961eb
--- /dev/null
+++ b/day09/src/com/inmind/abstract06/test/Square.java
@@ -0,0 +1,10 @@
+package com.inmind.abstract06.test;
+
+public class Square extends Rectangle{
+
+    //定义一个有参构造，必须要求传入边长，交给父类来管理
+    public Square(int bc){
+        super(bc,bc);
+    }
+
+}