请教高手帮忙

import javax.swing.JOptionPane;
 
public class shuikuanjisuan{
 public static void main(String[] s)
{  String roemin=JOptionPane.showInputDialog(null, "Enter the filling status:\n"+"0-single filer,1-married jointly,\n"+"2-married separately,3-head of       household)","个人所得税",JOptionPane.QUESTION_MESSAGE);
  int roemin1=Integer.parseInt(roemin);
  String roemin2=JOptionPane.showInputDialog(null,"Enter the taxable income",JOptionPane.QUESTION_MESSAGE);
  double income=Double.parseDouble(roemin2);
  double tax=0;
  switch(roemin1)
  {case 0:
   if(income<=6000)
     tax=income*0.10;
  else if(income<=27950)
     tax=6000*0.10+(income-6000)*0.15;
  else if(income<=67700)
     tax=6000*0.10+(27950-6000)*0.15+(income-27950)*0.27;
  else if(income<=141250)
     tax=6000*0.10+(27950-6000)*0.15+(67700-27950)*0.27+(income-67700)*0.30;
  else if(income<=307050)
     tax=6000*0.10+(27950-6000)*0.15+(67700-27950)*0.27+(141250-67700)*0.30+(income-141250)*0.35;
     else
      tax=6000*0.10+(27950-6000)*0.15+(67700-27950)*0.27+(141250-67700)*0.30+(307050-141250)*0.35+(income-307050)*0.386;
     break;
   case 1:
   if(income<=12000)
     tax=income*0.10;
   else if(income<=46700)
     tax=12000*0.10+(income-12000)*0.15;
   else if(income<=112850)
     tax=12000*0.10+(46700-12000)*0.15+(income-46700)*0.27;
   else if(income<=171950)
     tax=12000*0.10+(46700-12000)*0.15+(112850-46700)*0.27+(income-112850)*0.30;
   else if(income<=307050)
     tax=12000*0.10+(46700-12000)*0.15+(112850-46700)*0.27+(171950-112850)*0.30+(income-171950)*0.35;
   else 
     tax=12000*0.10+(46700-12000)*0.15+(112850-46700)*0.27+(171950-112850)*0.30+(307050-171950)*0.35+(income-307050)*0.386;
     break;
   case 2:
   if(income<=6000) 
     tax=income*0.10;
    else if(income<=23350)
     tax=6000*0.10+(income-6000)*0.15;
    else if(income<=56425)
     tax=6000*0.10+(23350-6000)*0.15+(income-23350)*0.27;
    else if(income<=85975)
     tax=6000*0.10+(23350-6000)*0.15+(56425-23350)*0.27+(income-56425)*0.30;
    else if(income<=153525)
     tax=6000*0.10+(23350-6000)*0.15+(56425-23350)*0.27+(85975-56425)*0.30+(income-85975)*0.35;
    else
     tax=6000*0.10+(23350-6000)*0.15+(56425-23350)*0.27+(85975-56425)*0.30+(153525-85975)*0.35+(income-153525)*0.386;
     break;
    case 3:
     if(income<=10000)
      tax=income*0.10;
     else if(income<=37450)
      tax=10000*0.10+(income-10000)*0.15;
     else if(income<=96700)
      tax=10000*0.10+(37450-10000)*0.15+(income-37450)*0.27;
     else if(income<=156600)
      tax=10000*0.10+(37450-10000)*0.15+(96700-37450)*0.27+(income-96700)*0.30;
     else if(income<=307050)
      tax=10000*0.10+(37450-10000)*0.15+(96700-37450)*0.27+(156600-96700)*0.30+(income-156600)*0.35;
     else 
      tax=10000*0.10+(37450-10000)*0.15+(96700-37450)*0.27+(156600-96700)*0.30+(307050-156600)*0.35+(income-307050)*0.386;
     break;
     default:
      JOptionPane.showMessageDialog(null,"输入超出范围,请重新输入:","个人所得税",JOptionPane.INFORMATION_MESSAGE);  
   }
  JOptionPane.showMessageDialog(null,"Tax is"+tax,"个人所得税",JOptionPane.INFORMATION_MESSAGE);
  }while(roemin1);
 }
}为什么我输入大于4以后的数后default后面还输出String roemin2=JOptionPane.showInputDialog(null,"Enter the taxable income",JOptionPane.QUESTION_MESSAGE);
这一行。我还想循环整个程序就是说，输出结果后，自动返回一开始的地方，让你重新输入。
谢谢

解决方案 »

  1.   

    import javax.swing.JOptionPane; 
      
    public class shuikuanjisuan{ 
     public static void main(String[] s) 
    { int roemin1;
     {
      String roemin=JOptionPane.showInputDialog(null, "Enter the filling status:\n"+"0-single filer,1-married jointly,\n"+"2-married separately,3-head of       household)","个人所得税",JOptionPane.QUESTION_MESSAGE); 
       roemin1=Integer.parseInt(roemin); 
      String roemin2=JOptionPane.showInputDialog(null,"Enter the taxable income","个人所得税",JOptionPane.QUESTION_MESSAGE); 
      double income=Double.parseDouble(roemin2); 
      double tax=0; 
      switch(roemin1) 
      {case 0: 
       if(income <=6000) 
         tax=income*0.10; 
      else if(income <=27950) 
         tax=6000*0.10+(income-6000)*0.15; 
      else if(income <=67700) 
         tax=6000*0.10+(27950-6000)*0.15+(income-27950)*0.27; 
      else if(income <=141250) 
         tax=6000*0.10+(27950-6000)*0.15+(67700-27950)*0.27+(income-67700)*0.30; 
      else if(income <=307050) 
         tax=6000*0.10+(27950-6000)*0.15+(67700-27950)*0.27+(141250-67700)*0.30+(income-141250)*0.35; 
         else 
          tax=6000*0.10+(27950-6000)*0.15+(67700-27950)*0.27+(141250-67700)*0.30+(307050-141250)*0.35+(income-307050)*0.386; 
         break; 
       case 1: 
       if(income <=12000) 
         tax=income*0.10; 
       else if(income <=46700) 
         tax=12000*0.10+(income-12000)*0.15; 
       else if(income <=112850) 
         tax=12000*0.10+(46700-12000)*0.15+(income-46700)*0.27; 
       else if(income <=171950) 
         tax=12000*0.10+(46700-12000)*0.15+(112850-46700)*0.27+(income-112850)*0.30; 
       else if(income <=307050) 
         tax=12000*0.10+(46700-12000)*0.15+(112850-46700)*0.27+(171950-112850)*0.30+(income-171950)*0.35; 
       else  
         tax=12000*0.10+(46700-12000)*0.15+(112850-46700)*0.27+(171950-112850)*0.30+(307050-171950)*0.35+(income-307050)*0.386; 
         break; 
       case 2: 
       if(income <=6000)  
         tax=income*0.10; 
        else if(income <=23350) 
         tax=6000*0.10+(income-6000)*0.15; 
        else if(income <=56425) 
         tax=6000*0.10+(23350-6000)*0.15+(income-23350)*0.27; 
        else if(income <=85975) 
         tax=6000*0.10+(23350-6000)*0.15+(56425-23350)*0.27+(income-56425)*0.30; 
        else if(income <=153525) 
         tax=6000*0.10+(23350-6000)*0.15+(56425-23350)*0.27+(85975-56425)*0.30+(income-85975)*0.35; 
        else 
         tax=6000*0.10+(23350-6000)*0.15+(56425-23350)*0.27+(85975-56425)*0.30+(153525-85975)*0.35+(income-153525)*0.386; 
         break; 
        case 3: 
         if(income <=10000) 
          tax=income*0.10; 
         else if(income <=37450) 
          tax=10000*0.10+(income-10000)*0.15; 
         else if(income <=96700) 
          tax=10000*0.10+(37450-10000)*0.15+(income-37450)*0.27; 
         else if(income <=156600) 
          tax=10000*0.10+(37450-10000)*0.15+(96700-37450)*0.27+(income-96700)*0.30; 
         else if(income <=307050) 
          tax=10000*0.10+(37450-10000)*0.15+(96700-37450)*0.27+(156600-96700)*0.30+(income-156600)*0.35; 
         else  
          tax=10000*0.10+(37450-10000)*0.15+(96700-37450)*0.27+(156600-96700)*0.30+(307050-156600)*0.35+(income-307050)*0.386; 
         break; 
         default: 
          JOptionPane.showMessageDialog(null,"输入超出范围,请重新输入:","个人所得税",JOptionPane.INFORMATION_MESSAGE);   
       } 
      JOptionPane.showMessageDialog(null,"Tax is"+tax,"个人所得税",JOptionPane.INFORMATION_MESSAGE); 
      } while(roemin1!=0);
     } 
    }