day09--抽象类的练习

day09/src/com/inmind/abstract06/test/Circle.java

@@ -0,0 +1,20 @@
+package com.inmind.abstract06.test;
+
+
+public class Circle extends Shape {
+
+    //定义一个有参构造，必须要求传入半径，交给父类来管理
+    public Circle(int r){
+        super(0,0,r);
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI*getR()*getR();
+    }
+
+    @Override
+    public double getZC() {
+        return 2*Math.PI*getR();
+    }
+}

day09/src/com/inmind/abstract06/test/Demo09.java

@@ -14,6 +14,15 @@ package com.inmind.abstract06.test;
  */
 public class Demo09 {
     public static void main(String[] args) {
+        //创建一个长方形对象
+        Rectangle rectangle = new Rectangle(4,2);
+        System.out.println("长方形的面积："+rectangle.getArea());
+        System.out.println("长方形的周长："+rectangle.getZC());
+        //创建一个圆形对象
+        Circle circle = new Circle(2);
+        System.out.println("圆形的面积："+circle.getArea());
+        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
     }
 }

day09/src/com/inmind/abstract06/test/Rectangle.java

@@ -0,0 +1,19 @@
+package com.inmind.abstract06.test;
+
+public class Rectangle extends Shape{
+
+    //定义一个有参构造，必须要求传入长宽，交给父类来管理
+    public Rectangle(int chang,int kuan){
+        super(chang,kuan,0);
+    }
+
+    @Override
+    public double getArea() {
+        return getChang()*getKuan();
+    }
+
+    @Override
+    public double getZC() {
+        return (getChang()+getKuan())*2;
+    }
+}

day09/src/com/inmind/abstract06/test/Shape.java

@@ -0,0 +1,46 @@
+package com.inmind.abstract06.test;
+
+public abstract class Shape {
+    //定义共性的属性：涵盖大部分形状的属性
+    private int chang;//矩形的长
+    private int kuan;//矩形的宽
+    private int r;//圆的半径
+
+    //满参构造：创建对象，对属性进行赋值
+    public Shape(int chang, int kuan, int r) {
+        this.chang = chang;
+        this.kuan = kuan;
+        this.r = r;
+    }
+
+    //提供get/set方法，对私有的属性进行操作
+    public int getChang() {
+        return chang;
+    }
+
+    public void setChang(int chang) {
+        this.chang = chang;
+    }
+
+    public int getKuan() {
+        return kuan;
+    }
+
+    public void setKuan(int kuan) {
+        this.kuan = kuan;
+    }
+
+    public int getR() {
+        return r;
+    }
+
+    public void setR(int r) {
+        this.r = r;
+    }
+
+    //计算面积的方法
+    public abstract double getArea();
+    //计算周长的方法
+    public abstract double getZC();
+
+}