这个程序哪里出错了？
import javax.swing.*;
public class bonus1
{
    public static void main (String args[])
    {
  double pay;
        int mouth;
         pay=(double)System.in.read();
        mouth=(int)(pay)/100000;
    double    i1=(100000*0.1);
    double    i2=(100000*0.075+i1);
    double    i4=(200000*0.05+i2);
    double    i6=(200000*0.03+i4);
    double    i10=(400000*0.015+i6);   
        
   
            switch(mouth)
            {
                case 0:i=i1; break;
                case 1:i=i1+(pay-i1)*0.075; break;
                case 2:case 3:i=i2+(pay-i2)*0.05; break;
                case 4:case 5:i=i4+(pay-i4)*0.03; break;
                case 6:case 7:case 8:case 9:i=i6+(pay-i6)*0.015; break;
                case 10:i=i10+(pay-i10)*0.01;
                }
        System.out.print(i);
        }
   
    }

import 导入这个包
public class Bonus1 {
    private static double i;//你没定义
    public static void main (String args[]) throws IOException
    {
  double pay;
        int mouth;
         pay=(double)System.in.read();
        mouth=(int)(pay)/100000;
    double    i1=(100000*0.1);
    double    i2=(100000*0.075+i1);
    double    i4=(200000*0.05+i2);
    double    i6=(200000*0.03+i4);
    double    i10=(400000*0.015+i6);   
        
   
            switch(mouth)
            {
                case 0:i=i1; break;
                case 1:i=i1+(pay-i1)*0.075; break;
                case 2:case 3:i=i2+(pay-i2)*0.05; break;
                case 4:case 5:i=i4+(pay-i4)*0.03; break;
                case 6:case 7:case 8:case 9:i=i6+(pay-i6)*0.015; break;
                case 10:i=i10+(pay-i10)*0.01;
                }
        System.out.print(i);
        }
   
}