我正在做一个项目，计算不同容器（长方体，圆柱体，球体）的体积，平均体积和标准偏差

Question

我正在做一个计算不同容器（长方体，圆柱体，球体）的体积，平均体积和标准偏差的项目

我为每个容器和抽象类（Shape）编写了一个类。在包含main方法的类中，我使用了arrayList来添加每个容器，但实际上我遇到的问题是我做了一个循环来提示用户他/她有哪种容器，在响应后，我可以调用右边的构造函数，但在输入第一个容器的所有内容后，循环终止。

我的主要方法代码是：

import java.util.*;
class testShape
{

   public static void main(String args [])
   throws java.io.IOException
   {

      double total = 0;
      int i,n;
      double deviation,average,sdeviation;
      double sd = 0;
      double s = 0;
      Scanner sc = new Scanner(System.in);

      ArrayList<Shape> shapelist = new ArrayList<Shape>();

      for(i=0;i<3;i++)
      {

         System.out.println("Enter shape: B for box,C for cylinder, S for sphere ");

         char c=(char)System.in.read();



         if((c=='B')||(c=='b'))
         {


            System.out.println("How many boxes do you have");
            n = sc.nextInt();
            for(i=0;i<n;i++){
               shapelist.add(new Box());
            }
            for(i=0;i<shapelist.size();i++)
            {
               System.out.println("--------"+shapelist.get(i).getShapeName() + "----------"); 
               System.out.println(shapelist.get(i).toString()); 
               System.out.println("The volume of "+shapelist.get(i).getShapeName()+""+(i+1)+" is "+shapelist.get(i).findVolume());  
               total = total+ shapelist.get(i).findVolume() ; 
            }

            System.out.println("-------------------\n");
            System.out.println("the total volume of"+shapelist.get(0).getShapeName()+" is: "+total+"\n");
            average= total/n;
            System.out.println("The average volume of "+shapelist.get(0).getShapeName()+" is: "+average);
            for(i=0;i<n;i++){

               deviation = (shapelist.get(i).findVolume()-average);
               s= deviation*deviation;
               sd = s+sd;
            }
            sdeviation =Math.sqrt(sd/n);
            System.out.println("the standard deviation is: "+sdeviation);
         }


         else  if((c=='C')||(c=='c')){
            System.out.println("How many cylinders do you have");

            n = sc.nextInt();
            for(i=0;i<n;i++){
               shapelist.add(new Cylinder());
            }
            for(i=0;i<shapelist.size();i++){
               System.out.println("--------"+shapelist.get(i).getShapeName() + "----------"); 
               System.out.println(shapelist.get(i).toString()); 
               System.out.println("The volume of "+shapelist.get(i).getShapeName()+""+(i+1)+" is "+shapelist.get(i).findVolume());  
               total = total+ shapelist.get(i).findVolume() ; 
            }
            System.out.println("-------------------\n");
            System.out.println("the total volume of"+shapelist.get(0).getShapeName()+" is: "+total+"\n");
            average= total/n;
            System.out.println("The average volume of "+shapelist.get(0).getShapeName()+" is: "+average);

            for(i=0;i<n;i++){
               deviation = (shapelist.get(i).findVolume()-average);
               s= deviation*deviation;
               sd = s+sd;
            }
            sdeviation =Math.sqrt(sd/n);
            System.out.println("the standard deviation is: "+sdeviation);
         }

         else if((c=='s')||(c=='S')){
            System.out.println("How many Sphers do you have");

            n = sc.nextInt();
            for(i=0;i<n;i++){
               shapelist.add(new Sphere());
            }
            for(i=0;i<shapelist.size();i++){
               System.out.println("--------"+shapelist.get(i).getShapeName() + "----------"); 
               System.out.println(shapelist.get(i).toString()); 
               System.out.println("The volume of "+shapelist.get(i).getShapeName()+""+(i+1)+" is "+shapelist.get(i).findVolume());  
               total = total+ shapelist.get(i).findVolume() ; 
            }
            System.out.println("-------------------\n");
            System.out.println("the total volume of"+shapelist.get(0).getShapeName()+" is: "+total+"\n");
            average= total/n;
            System.out.println("The average volume of "+shapelist.get(0).getShapeName()+" is: "+average);

            for(i=0;i<n;i++){
               deviation = (shapelist.get(i).findVolume()-average);
               s= deviation*deviation;
               sd = s+sd;
            }
            sdeviation =Math.sqrt(sd/n);
            System.out.println("the standard deviation is: "+sdeviation);
         }

         else 
            System.out.println("Invalid selection");


      }



   }  

}