Help with simple array program

Question

my program compiles and runs but when after i enter in 0 it says that the total cost is 0.0 any help would be great thanks
/**Write a program that asks the user for the price and quantity of up to 10 items. The program accepts input until the user enters a price of 0. 
*The program applies a 7% sales tax and prints the total cost.
Sample
Enter price 1:
1.95
Enter quantity 1:
2
Enter price 2:
5.00
Enter quantity 2:
1
Enter price 3:
0
Your total with tax is 9.52
import java.util.*;
public class Cashregister
static Scanner input = new Scanner(System.in);
static double userinput = 1;
public static void main(String[] args)
  int anykey;
  int howmanyproducts;
  System.out.println("This Program will allow you to enter the price and quanity of a set of items until you press zero, and after you press zero it will put the tax on it and give you the subtotal.");
  int whichproduct = 1;//used to say what
  int whichquanity = 1;
  double beforetax = 0;
  double aftertax = 0;
  double [] finalproduct = new double [9];
  double [] finalquant = new double[9];
  double [] finalanswer = new double[9];
  double taxrate = .07;
  int index = 0;
  while(userinput !=0)
   System.out.println("Enter price " + whichproduct + ":");
   userinput = input.nextDouble();
   whichproduct ++;
   if(userinput != 0)
   finalproduct[index] = userinput;
   System.out.println("Enter quanity " + whichquanity + ":");
   userinput = input.nextInt();
   finalquant[index] = userinput;
   whichquanity ++;
   index ++;
  else
  int [] indecies = new int [index];//used for array.length purposes
   for(int j = 0; j<indecies.length; j++)
     finalanswer[index] = finalproduct[index] * finalquant[index];
  for(int k = 0; k < indecies.length; k++)
     finalanswer[k] = finalanswer[k] + finalanswer[k];
     beforetax = finalanswer[k];
     aftertax = beforetax * taxrate;
  System.out.println("The total cost with tax will be $" + aftertax);
}

Answer 1

I tried ot indent better so it is more readable and i removed the tax out of my loop along with another thing i knew wasnt supposed to be their. Ran it again and i still got the same total coast = 0.0
import java.util.*;
public class Cashregister
static Scanner input = new Scanner(System.in);
static double userinput = 1;
public static void main(String[] args)
  int anykey;
  int howmanyproducts;
  System.out.println("This Program will allow you to enter the price and quanity of a set of items until you press zero, and after you press zero it will put the tax on it and give you the subtotal.");
  int whichproduct = 1;
  int whichquanity = 1;
  double beforetax = 0;
  double aftertax = 0;
  double [] finalproduct = new double [9];
  double [] finalquant = new double[9];
  double [] finalanswer = new double[9];
  double taxrate = .07;
  int index = 0;
  while(userinput !=0)
   System.out.println("Enter price " + whichproduct + ":");
   userinput = input.nextDouble();
   whichproduct ++;
        if(userinput != 0)
                finalproduct[index] = userinput;
                System.out.println("Enter quanity " + whichquanity + ":");
                userinput = input.nextInt();
                finalquant[index] = userinput;
                whichquanity ++;
                index ++;
        else
                int [] indecies = new int [index];
                for(int j = 0; j<indecies.length; j++)
                        finalanswer[index] = finalproduct[index] * finalquant[index];
                for(int k = 0; k < indecies.length; k++)
                       finalanswer[0] = finalanswer[k] + finalanswer[k];
                beforetax = finalanswer[0];
                aftertax = beforetax * taxrate;
                System.out.println("The total cost with tax will be $" + aftertax);
}