Question

我刚刚完成了以下程序。现在我们被要求在snipet中创建以下代码，这些代码已经呈现在一个从驱动程序调用的类中，但我不知道它的外观，工作方式或术语需要做什么此

/**
 * Will Calculate the Area of Given Shapes.
 * 
 * @author Adrian Miranda
 * @version (a version number or a date)
 */

import java.util.Scanner; 
public class Area_Shapes
{
   public static void main(String[] args)
   {
      Scanner stdIn = new Scanner(System.in);
      int Shape;
      String A = "The Area is ";

      double Area;
      double Base;
      double Height;
      double q1;
      double q2;
      double radius;
      double Length;
      char response;



      do
      { 
         System.out.println(" Enter A Shape 1 = triangle 2 = square 3 = rhombus 4 = circle 5 = rectangle: ");
         Shape = stdIn.nextInt();
         if (Shape == 1)
         {

            System.out.println("Enter Base: ");
            Base = stdIn.nextDouble();
            System.out.println("Enter Height: ");
            Height = stdIn.nextDouble();

            Area = (Base * Height)/ 2 ;
            System.out.println( A + Area);
            System.out.println(" Enter Another Shape? (y/n): ");
            response = stdIn.next() .charAt(0);
         }

         else if (Shape == 2)
         {
            System.out.println("Enter length ");
            Length = stdIn.nextDouble();


            Area = Length * Length;
            System.out.println( A + Area);
            System.out.println(" Enter Another Shape? (y/n): ");
            response = stdIn.next() .charAt(0);

         }

         else if (Shape == 3)
         {
            System.out.println("Enter q1: ");
            q1 = stdIn.nextDouble();
            System.out.println("Enter q2: ");
            q2 = stdIn.nextDouble();

            Area = q1 * q2 * 0.5 ;
            System.out.println( A + Area);
            System.out.println(" Enter Another Shape? (y/n): ");
            response = stdIn.next() .charAt(0);;
         }
         else if (Shape == 4)
         {
            System.out.println("Enter radius ");
            radius = stdIn.nextDouble();


            Area = radius * Math.PI * radius;
            System.out.println( A + Area);
            System.out.println(" Enter Another Shape? (y/n): ");
            response = stdIn.next() .charAt(0);

         }
         else if (Shape == 5)
         {

            System.out.println("Enter Base: ");
            Base = stdIn.nextDouble();
            System.out.println("Enter Height: ");
            Height = stdIn.nextDouble();

            Area = (Base * Height) ;
            System.out.println( A + Area);
            System.out.println(" Enter Another Shape? (y/n): ");
            response = stdIn.next() .charAt(0);
         }
         else
         {
            System.out.println("error, invalid shape, please enter a square triangle or rhombus.");
            System.out.println(" Enter Another Shape? (y/n}: ");
            response = stdIn.next() .charAt(0);;
         }
      }while (response == 'y');
   } 
}

Answer 1

从概念上讲，您应该从main(...)类中删除Area_Shapes方法。在Area_Shapes中创建一个接受必要参数的构造函数。创建一个具有ShapesDriver方法的新类（例如main(...)）。收集驱动程序中的信息后，实例化Area_Shapes类。

我实际上会创建多个Shape类而不是将所有内容混合在一起的单个类，但这是更大的重构（但更像OO）。我还会创建一个计算和显示结果的方法，而不是在构造函数中完成工作。

尽管如此，基本的概念方法（编辑：为驱动程序类添加了一个示例循环）

public class Area_Shapes {
   public Area_Shapes(int shape, double l1, double l2)
   {
      double area;
      switch (shape) {
        case 1:
         area = (l1 * l2) / 2;
          System.out.println("A triangle has an area of: " + area);
          break;

       ...
      }
   }
}

驱动程序类

public class Driver {
   public static void main(String args[]) {
     boolean keepGoing = true;
     do {
       //collect shape information 
       System.out.println("Enter your shape (1 = triangle ...");
       shape = stdIn.nextInt();

       // based upon the shape, collect the inputs
       double inp1, inp2;
       switch (shape) {
         case 1:
           // inp1 is the base, inp2 is the height
           System.out.println("Enter Base: ");
           inp1 = stdIn.nextDouble();
           System.out.println("Enter Height: ");
           inp2 = stdIn.nextDouble();
         break;
       }  //switch shape

       // create a shape area instance; this calculates the
       //   area and outputs the answer  
       Shape_Area sa = new Shape_Area(shape, inp2, inp2);

       // prompt the user to enter another shape
       if (user_wants_to_stop) {
         keepGoing = false;
       }
     } while (keepGoing)
   } // main()
}

如何将我创建的以下Java代码创建到驱动程序并调用方法/类？

1 个答案: