6 persons

HomeWork.md

@@ -5,7 +5,9 @@
     - [1 mijuan](src/main/java/com/bt/xlt/homework0319/mijuan/MiJuanArea.java)
     - [2 xueguiyang](src/main/java/com/bt/xlt/homework0319/xueguiyang/XueguiyangTestShape.java) -- 构造函数的访问范围
     - [3 xiaoma](src/main/java/com/bt/xlt/homework0319/xiaoma/XiaomaTestDemo.java)
-    - [4 lichangxing](src/main/java/com/bt/xlt/homework0319/xiaoma/LiChangxingTestShapeDemo.java) -- 用构造函数初始化属性值，会比可变长度的参数要好
+    - [4 lichangxing](src/main/java/com/bt/xlt/homework0319/lichangxing/LiChangxingTestShapeDemo.java) -- 用构造函数初始化属性值，会比可变长度的参数要好
+    - [5 jiabin](src/main/java/com/bt/xlt/homework0319/jiabin/JiaBinShapeTest.java) -- 契合题意，更好使用构造函数初始化属性值
+    - [6 lidongkun](src/main/java/com/bt/xlt/homework0319/lidongkun/ShapeArea.java) -- 不错
 
     - 感悟：
         - 构造函数没有特殊情况，一般用public修饰

src/main/java/com/bt/xlt/homework0319/jiabin/JiaBinCircle.java

@@ -0,0 +1,19 @@
+package com.bt.xlt.homework0319.jiabin;
+
+/**
+ * Created by bin.jia on 2016/3/21.
+ */
+public class JiaBinCircle extends JiaBinShape {
+    final double PI = 3.14;
+
+    @Override
+    public void getArea(double radius) {
+        area = PI * Math.pow(radius,2);
+        System.out.println("该圆形的面积为：" + area);
+    }
+
+    @Override
+    public void getArea(double num1, double num2) {
+
+    }
+}

src/main/java/com/bt/xlt/homework0319/jiabin/JiaBinJudgeShape.java

@@ -0,0 +1,37 @@
+package com.bt.xlt.homework0319.jiabin;
+
+import java.util.Scanner;
+
+/**
+ * Created by bin.jia on 2016/3/21.
+ */
+public class JiaBinJudgeShape {
+
+    public void judgeShape(int shape) {
+        Scanner s = new Scanner(System.in);
+        switch (shape) {
+            case 1:
+                System.out.println("请输入圆形半径：");
+                double radius = s.nextDouble();
+                JiaBinShape circle = new JiaBinCircle();
+                circle.getArea(radius);
+                break;
+            case 2:
+                System.out.println("请输入矩形的两个边长：");
+                double length1 = s.nextDouble();
+                double length2 = s.nextDouble();
+                JiaBinShape square = new JiaBinSquare();
+                square.getArea(length1, length2);
+                break;
+            case 3:
+                System.out.println("请输入三角形的底和高：");
+                double length = s.nextDouble();
+                double height = s.nextDouble();
+                JiaBinShape triangle = new JiaBinTriangle();
+                triangle.getArea(length, height);
+                break;
+            default:
+                System.out.println("输入数字有误，请输入数字1、2、3！");
+        }
+    }
+}

src/main/java/com/bt/xlt/homework0319/jiabin/JiaBinShape.java

@@ -0,0 +1,12 @@
+package com.bt.xlt.homework0319.jiabin;
+
+/**
+ * Created by bin.jia on 2016/3/21.
+ */
+public abstract class JiaBinShape {
+    public double area;
+
+    public abstract void getArea(double num);
+
+    public abstract void getArea(double num1,double num2);
+}

src/main/java/com/bt/xlt/homework0319/jiabin/JiaBinShapeTest.java

@@ -0,0 +1,22 @@
+package com.bt.xlt.homework0319.jiabin;
+
+import java.util.Scanner;
+
+/**
+ * Created by bin.jia on 2016/3/21.
+ * Reviewer: beigui
+ * Review Date: 2016/3/22
+ * Comments: 到目前为止，最符合题意的程序。
+ *          改进点：getArea需不需要写两个方法？ 好好考虑封装，巧用构造函数
+ */
+public class JiaBinShapeTest {
+    public static void main(String[] args) {
+        Scanner s = new Scanner(System.in);
+        System.out.println("圆形：请输入1，矩形：请输入2，三角形：请输入3！");
+
+        int shape = s.nextInt();
+
+        JiaBinJudgeShape judge = new JiaBinJudgeShape();
+        judge.judgeShape(shape);
+    }
+}

src/main/java/com/bt/xlt/homework0319/jiabin/JiaBinSquare.java

@@ -0,0 +1,18 @@
+package com.bt.xlt.homework0319.jiabin;
+
+/**
+ * Created by bin.jia on 2016/3/21.
+ */
+public class JiaBinSquare extends JiaBinShape{
+
+    @Override
+    public void getArea(double length1, double length2) {
+        area = length1 * length2;
+        System.out.println("该矩形的面积为：" + area);
+    }
+
+    @Override
+    public void getArea(double num) {
+
+    }
+}

src/main/java/com/bt/xlt/homework0319/jiabin/JiaBinTriangle.java

@@ -0,0 +1,18 @@
+package com.bt.xlt.homework0319.jiabin;
+
+/**
+ * Created by bin.jia on 2016/3/21.
+ */
+public class JiaBinTriangle extends JiaBinShape {
+
+    @Override
+    public void getArea(double length, double height) {
+        area = length * height / 2;
+        System.out.println("该三角形的面积为：" + area);
+    }
+
+    @Override
+    public void getArea(double num) {
+
+    }
+}

src/main/java/com/bt/xlt/homework0319/lidongkun/Circle.java

@@ -0,0 +1,22 @@
+package com.bt.xlt.homework0319.lidongkun;
+
+import java.util.Scanner;
+
+/**
+ * Created by lidongkun on 2016/3/21.
+ */
+public class Circle extends Shape {
+    public void getArea() {
+        double area = 0;
+        Scanner cl = new Scanner(System.in);
+        System.out.println("请输入该园的半径:");
+        double radii = cl.nextDouble();
+
+        if(radii > 0) {
+            area = radii * radii *3.14;
+            System.out.println("园的面积为：" + area);
+        }else {
+            System.out.println("园的半径不能小于等于零");
+        }
+    }
+}

src/main/java/com/bt/xlt/homework0319/lidongkun/Master.java

@@ -0,0 +1,11 @@
+package com.bt.xlt.homework0319.lidongkun;
+
+/**
+ * Created by lidongkun on 2016/3/22.
+ */
+public class Master {
+    public void getAreas(Shape shape) {
+        System.out.println("输入您需要获取面积的条件：");
+        shape.getArea();
+    }
+}

src/main/java/com/bt/xlt/homework0319/lidongkun/Rectang.java

@@ -0,0 +1,26 @@
+package com.bt.xlt.homework0319.lidongkun;
+
+import java.util.Scanner;
+
+/**
+ * Created by lidongkun on 2016/3/21.
+ */
+public class Rectang extends Shape{
+    public void getArea() {
+        double area = 0;
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入矩形的长：");
+        double a = sc.nextDouble();
+        System.out.println("请输入矩形的宽：");
+        double b = sc.nextDouble();
+
+        if(a > 0 && b > 0) {
+            area = a * b;
+            System.out.println("矩形的面积为：" + area);
+        }else {
+            System.out.println("矩形的长和宽都不能小于零.");
+        }
+
+    }
+
+}

src/main/java/com/bt/xlt/homework0319/lidongkun/Shape.java

@@ -0,0 +1,10 @@
+package com.bt.xlt.homework0319.lidongkun;
+
+import java.util.Scanner;
+
+/**
+ * Created by lidongkun on 2016/3/21.
+ */
+public abstract class  Shape {
+    public abstract void getArea();
+}

src/main/java/com/bt/xlt/homework0319/lidongkun/ShapeArea.java

@@ -0,0 +1,27 @@
+package com.bt.xlt.homework0319.lidongkun;
+
+/**
+ * Created by lidongkun on 2016/3/21.
+ * Reviewer: beigui
+ * Review Date: 2016/3/22
+ */
+public class ShapeArea {
+    public static void main(String[] args) {
+        int select = Integer.parseInt(args[0]);
+        Master master = new Master();
+
+      switch(select) {
+            case 1:
+               master.getAreas(new Circle());
+                break;
+            case 2:
+                master.getAreas(new Triangle());
+                break;
+            case 3:
+                master.getAreas(new Rectang());
+                break;
+            default:
+                System.out.println("选择错误");
+        }
+    }
+}

src/main/java/com/bt/xlt/homework0319/lidongkun/Triangle.java

@@ -0,0 +1,26 @@
+package com.bt.xlt.homework0319.lidongkun;
+
+import java.util.Scanner;
+
+/**
+ * Created by lidongkun on 2016/3/21.
+ */
+public class Triangle extends Shape {
+    public void getArea() {
+        double area = 0;
+        Scanner sc = new Scanner(System.in);
+        System.out.println("三角形的底长为：");
+        double a = sc.nextDouble();
+        System.out.println("三角形的高为：");
+        double b = sc.nextDouble();
+
+       if(a > 0 && b > 0) {
+           area = a * b / 2;
+           System.out.println("三角形的面积为" + area);
+       }else {
+           System.out.println("三角形的底和高均不能为0.");
+       }
+
+
+    }
+}