day09-抽象类案例-图形Shape-完善

day09/src/com/inmind/abstract05/test/Circle.java

@@ -0,0 +1,19 @@
+package com.inmind.abstract05.test;
+
+public class Circle extends Shape{
+
+    //强制要求创建圆形的时候，必定要给半径，才能创建圆形对象
+    public Circle(int r){
+        super(r);
+    }
+
+    @Override
+    public double getArea() {
+        return Math.PI*getR()*getR();
+    }
+
+    @Override
+    public double getZC() {
+        return 2*Math.PI*getR();
+    }
+}

day09/src/com/inmind/abstract05/test/Rectangle.java

@@ -5,7 +5,7 @@ public class Rectangle extends Shape{
 
     //强制要求创建矩形的时候，必定要给我一长宽，才能创建矩形对象
     public Rectangle(int chang ,int kuan){
-        super(chang,kuan,0);
+        super(chang,kuan);
     }
 
 

day09/src/com/inmind/abstract05/test/Shape.java

@@ -11,8 +11,22 @@ public abstract class Shape {
         this.chang = chang;
         this.kuan = kuan;
         this.r = r;
+
+        //初始化操作
     }
 
+    public Shape(int chang, int kuan) {
+        /*this.chang = chang;
+        this.kuan = kuan;*/
+        this(chang,kuan,0);
+    }
+
+    public Shape(int r) {
+//        this.r = r;
+        this(0, 0, r);
+    }
+
+
     public int getChang() {
         return chang;
     }

day09/src/com/inmind/abstract05/test/Square.java

@@ -0,0 +1,9 @@
+package com.inmind.abstract05.test;
+
+public class Square extends Rectangle{
+
+    //强制要求创建正方形的时候，必定要给我一个边长，才能创建正方形对象
+    public Square(int bc){
+        super(bc,bc);
+    }
+}

day09/src/com/inmind/abstract05/test/Test07.java

@@ -18,5 +18,14 @@ public class Test07 {
         Rectangle rectangle = new Rectangle(4, 2);
         System.out.println("矩形的面积是："+rectangle.getArea());
         System.out.println("矩形的周长是："+rectangle.getZC());
+        //创建一个圆形对象
+        Circle circle = new Circle(2);
+        System.out.println("圆形的面积是："+circle.getArea());
+        System.out.println("圆形的周长是："+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,但是能输出面积和周长
+        Square square = new Square(2);
+        System.out.println("正方形的周长是："+square.getZC());
+        System.out.println("正方形的面积是："+square.getArea());
     }
 }