From 62018f2ffa8e4c0e28cd7a38d6c2628d718e13e0 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sat, 25 Jul 2026 16:54:42 +0800
Subject: [PATCH] =?UTF-8?q?day09-=E7=BB=A7=E6=89=BF=E6=8A=BD=E8=B1=A1?=
 =?UTF-8?q?=E6=A1=88=E4=BE=8B--=E5=9B=BE=E5=BD=A2?=
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---
 day09/src/com/inmind/test08/Circle.java    | 18 +++++++
 day09/src/com/inmind/test08/Rectangle.java | 20 ++++++++
 day09/src/com/inmind/test08/Shape.java     | 56 ++++++++++++++++++++++
 day09/src/com/inmind/test08/Square.java    |  7 +++
 day09/src/com/inmind/test08/Test08.java    | 37 ++++++++++++++
 5 files changed, 138 insertions(+)
 create mode 100644 day09/src/com/inmind/test08/Circle.java
 create mode 100644 day09/src/com/inmind/test08/Rectangle.java
 create mode 100644 day09/src/com/inmind/test08/Shape.java
 create mode 100644 day09/src/com/inmind/test08/Square.java
 create mode 100644 day09/src/com/inmind/test08/Test08.java

diff --git a/day09/src/com/inmind/test08/Circle.java b/day09/src/com/inmind/test08/Circle.java
new file mode 100644
index 0000000..010d5cb
--- /dev/null
+++ b/day09/src/com/inmind/test08/Circle.java
@@ -0,0 +1,18 @@
+package com.inmind.test08;
+
+public class Circle extends Shape{
+
+    public Circle(double radius){
+        super(radius);
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI*getRadius()*getRadius();
+    }
+
+    @Override
+    public double getZC() {
+        return 2*Math.PI*getRadius();
+    }
+}
diff --git a/day09/src/com/inmind/test08/Rectangle.java b/day09/src/com/inmind/test08/Rectangle.java
new file mode 100644
index 0000000..12a741a
--- /dev/null
+++ b/day09/src/com/inmind/test08/Rectangle.java
@@ -0,0 +1,20 @@
+package com.inmind.test08;
+
+public class Rectangle extends Shape{
+
+    //继承中构造方法的传递值的方式，指定属性值
+    public Rectangle(double chang ,double width){
+        super(chang,width);
+    }
+
+
+    @Override
+    public double getArea() {
+        return getChang()*getWidth();
+    }
+
+    @Override
+    public double getZC() {
+        return 2*(getChang()+getWidth());
+    }
+}
diff --git a/day09/src/com/inmind/test08/Shape.java b/day09/src/com/inmind/test08/Shape.java
new file mode 100644
index 0000000..e097a30
--- /dev/null
+++ b/day09/src/com/inmind/test08/Shape.java
@@ -0,0 +1,56 @@
+package com.inmind.test08;
+
+public abstract class Shape {
+    //子类所需的属性
+    private double width;//宽
+    private double chang;//长
+    private double radius;//半径
+
+    public Shape(){
+
+    }
+
+    public Shape(double radius){
+        this.radius = radius;
+    }
+
+
+    public Shape(double chang ,double width){
+        this.chang = chang;
+        this.width = width;;
+    }
+
+    //get/set方法
+
+
+    public double getWidth() {
+        return width;
+    }
+
+    public void setWidth(double width) {
+        this.width = width;
+    }
+
+    public double getChang() {
+        return chang;
+    }
+
+    public void setChang(double chang) {
+        this.chang = chang;
+    }
+
+    public double getRadius() {
+        return radius;
+    }
+
+    public void setRadius(double radius) {
+        this.radius = radius;
+    }
+
+    //计算面积
+    public abstract double getArea();
+    //计算周长
+    public abstract double getZC();
+
+
+}
diff --git a/day09/src/com/inmind/test08/Square.java b/day09/src/com/inmind/test08/Square.java
new file mode 100644
index 0000000..0c297d7
--- /dev/null
+++ b/day09/src/com/inmind/test08/Square.java
@@ -0,0 +1,7 @@
+package com.inmind.test08;
+//正方形是一个特殊的矩形，长宽都是一样的
+public class Square  extends Rectangle{
+    public Square(double bc) {
+        super(bc, bc);
+    }
+}
diff --git a/day09/src/com/inmind/test08/Test08.java b/day09/src/com/inmind/test08/Test08.java
new file mode 100644
index 0000000..3f190be
--- /dev/null
+++ b/day09/src/com/inmind/test08/Test08.java
@@ -0,0 +1,37 @@
+package com.inmind.test08;
+/*
+抽象的意义：
+1.抽象方法，必定会被重写，对某一类事物的功能添加了约束，必须实现
+2.普通继承的重写：选择性地沿用父类的功能，选择性扩展父类功能
+ */
+
+/*
+- 定义形状抽象类Shape，矩形Rectangle和圆形Circle继承Shape类。
+- 圆形只能通过指定半径的方式，创建Circle对象。
+- 矩形只能通过指定长，宽的方法，创建Rectangle对象。
+
+并且计算出各自的面积和周长
+
+1.定义抽象类Shape，封装每个图形所需要的属性（长，宽，高，半径等等）
+2.定义抽象方法，求面积和周长的方法
+3.定义非抽象子类Rectangle，圆形Circle，并定义指定构造方法来创建对象
+4.在子类中，实现各自的求面积和周长的功能实现
+5.在测试类的主方法中，创建指定矩形和圆，调用方法即可
+ */
+
+public class Test08 {
+    public static void main(String[] args) {
+        //创建一个矩形对象
+        Rectangle rectangle = new Rectangle(2, 3);
+        System.out.println("矩形的面积为："+rectangle.getArea());
+        System.out.println("矩形的周长为："+rectangle.getZC());
+        //创建一个圆形对象
+        Circle circle = new Circle(2);
+        System.out.println("圆形的面积为："+circle.getArea());
+        System.out.println("圆形的周长为："+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,但也能直接调用获取周长和面积的功能
+        Square square = new Square(2);
+        System.out.println("正方形的周长为："+square.getZC());
+        System.out.println("正方形的面积为："+square.getArea());
+    }
+}