From f44e8b3cff43d8cb78ba4f982c54df79c8629ee5 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Fri, 23 Jan 2026 11:24:18 +0800
Subject: [PATCH] =?UTF-8?q?day09-=E6=8A=BD=E8=B1=A1=E7=B1=BB=E7=9A=84?=
 =?UTF-8?q?=E7=BB=83=E4=B9=A0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 day09/src/com/inmind/abstract07/test/Rectangle.java |  6 ++++++
 day09/src/com/inmind/abstract07/test/Square.java    | 11 +++++++++++
 day09/src/com/inmind/abstract07/test/Test08.java    |  3 +++
 3 files changed, 20 insertions(+)
 create mode 100644 day09/src/com/inmind/abstract07/test/Square.java

diff --git a/day09/src/com/inmind/abstract07/test/Rectangle.java b/day09/src/com/inmind/abstract07/test/Rectangle.java
index b3aec99..79f7cdd 100644
--- a/day09/src/com/inmind/abstract07/test/Rectangle.java
+++ b/day09/src/com/inmind/abstract07/test/Rectangle.java
@@ -9,6 +9,12 @@ public class Rectangle extends Shape{
         super(chang,kuan,0.0);
     }
 
+    public Rectangle(double bc){
+        //通过父类的构造方法，将长宽存储起来
+//        super(bc,bc,0.0);
+        this(bc, bc);
+    }
+
     @Override
     public double getArea() {
         //长*宽
diff --git a/day09/src/com/inmind/abstract07/test/Square.java b/day09/src/com/inmind/abstract07/test/Square.java
new file mode 100644
index 0000000..8c1150c
--- /dev/null
+++ b/day09/src/com/inmind/abstract07/test/Square.java
@@ -0,0 +1,11 @@
+package com.inmind.abstract07.test;
+
+public class Square extends Rectangle{
+
+    //定义一个正方行，必须要知道边长，
+    public Square(double bc){
+        //调用父类构造时，只需要传递一个参数
+        super(bc);
+    }
+    //直接继承父类的非私有的方法即可
+}
diff --git a/day09/src/com/inmind/abstract07/test/Test08.java b/day09/src/com/inmind/abstract07/test/Test08.java
index 5c6a97a..be1a3b5 100644
--- a/day09/src/com/inmind/abstract07/test/Test08.java
+++ b/day09/src/com/inmind/abstract07/test/Test08.java
@@ -34,5 +34,8 @@ public class Test08 {
 
         //此时如何快速定义出一个正方行的类，还不用自己实现周长和面积的方法，但是能获取周长和面积！！！
         //提示：1.正方形是一个特殊的长方形  2.继承是可以多层继承的
+        Square square = new Square(2);
+        System.out.println(square.getArea());
+        System.out.println(square.getZC());
     }
 }