Thread: Help with double array method

Hi,
I am new to programming. I was asked to make a program that uses a method to sum the grandtotal and a method for sorting.

So far the output of the program is perfect, however, i have not met the requirement of having a method sum the totals and a method to sort the collections. I have wrecked my brain trying to figure this out for two days. I will post my code and any help will be appreciated. By the way I have also tried building arrays to hold the (price*cases) amount, but there is no method to add a double to a regular array.

/*
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package farmersmarket2;
 
import java.lang.reflect.Array;
import java.util.Scanner; //uses scanner
import java.text.NumberFormat;//needed to format currency
import java.util.Locale; //used to get local format for currency
import java.util.ArrayList;//to create arrays
import java.util.Arrays;//to sort array
import java.util.Collections;//sort arraylist sisnce arrays will not sort lists
 
/**
 *
 * @author David
 */
public class FarmersMarket2 {
 
    /**
     * @param args the command line arguments
     */
 
 
 
    public static void main(String[] args) {
 
        Scanner input = new Scanner(System.in); // new scanner named input
        NumberFormat format = NumberFormat.getCurrencyInstance(Locale.US);
        ReceiptBuilder2 RB2; //Storage object
 
 
        //Declare Variables
        String Produce;//variable for produce name
        String produce;//store lower case name to change to upper
        String SKU ;//will hold SKU of 8 digits
        int cases; //will hold number of cases ordered
        double price;//price of produce
        boolean moreItems = true; //while control variable
        double ggtt = 0;//holds grandtotal
 
 
        //create Arrays
    ArrayList<String> receipt = new ArrayList<>();//10 element array
   //this is where i tried to create an array double[] runtotal 
 
 
        while (moreItems){ 
        //Ask for produce name
      System.out.println("Enter produce name to continue or"
              +"\"end\" to get total: ");
             produce = input.next();//set variable with name input
           Produce = produce.toUpperCase();
 
 
             //test for name to change moreItems
       if (!Produce.equalsIgnoreCase("end"))      
       {
 
 
 
       System.out.println(); //blank line for readability
 
        // Ask for 8 digit minimum SKU
        System.out.println("Please enter the 8 digit SKU number: ");//Get SKU
            SKU = input.next();//set variable SKU
        //validation of input    
        while (SKU.length() != 8 ) // check lenght of SKU    
        {     
         System.out.println("SKU must be exactly 8 digits. Please re-enter: ");
         SKU = input.next(); 
        }  // end while 
 
         System.out.println(); //Blank line for readibility
 
 
 
        //Ask for case quantity
        System.out.println("How many cases of this produce do you want? ");
           cases = input.nextInt();//set cases variable
 
        System.out.println();//blank line
 
 
 
        //Ask for produce price
        System.out.println("What is the price of each case? ");
            price = input.nextDouble();//set variable price
 
 
 
 
 
 
 
       //line break
     System.out.println("\n\n******************************************\n\n");
 
     //change the ggtt variable to a running total
 
     ggtt = ggtt+(price*cases);
    //at this point i would need to add the total to the array
     //so far failed miserably
 
 
   //send all info to new constructor
       //new constructor with 4 variables passed to it 
 
    RB2 = new ReceiptBuilder2(Produce,SKU,cases,price);
 
 
 
 
 
    receipt.add(RB2.toString());//add strings to the receipt array
 
 
 
    //Print receipt
        System.out.println("Thanks for shopping at the Farmer's Market!!\n");
        System.out.print("Product: "+ RB2.getName()+"\n");
        System.out.print("SKU number: "+RB2.getBarcode()+"\n");
        System.out.print("Price per case: "+format.format(RB2.getCost())+"\n");
        System.out.print("Cases ordered: "+RB2.getAmount()+"\n");
       System.out.print("SubTotal price: "+format.format(RB2.getTotal()) +"\n");
 
         //line break
     System.out.println("\n\n******************************************\n\n");
 
 
       }//end if portion
       else//begin else portion of if
       {
       moreItems = false;
 
 
 
       System.out.println("\n\n******************************************\n\n"
               + "\n\nThanks for shopping at the Farmer's Market!!\n");
 
 
       //display elements in array receipt
       System.out.println("Unsorted version of receipt");
 
 
     for (String item : receipt) {//display items in array receipt
         System.out.printf("%s\n\n", item);
         }//end for
 
 
     try
     {
 
     System.out.print("Order Total: "+format.format(ggtt));
     }
     catch (NullPointerException nullPointerException )
     {
         System.out.print("You did not purchase any items.\nTotal: $0.00");
     }    
 
 
 
                //line break
     System.out.println("\n\n******************************************\n\n"
             + "\n\nThanks for shopping at the Farmer's Market!!\n");
 
 
 
 
       }//end else area
 
         }//end while
 
      //method to sort arraylist
 
       Collections.sort(receipt);//method to sort list
 
       System.out.println("Sorted version of the reciept.");
 
        for (String temp2 : receipt)
        {
            System.out.print(temp2+"\n\n");
        }
        System.out.print("Order Total: "+format.format(ggtt));//sho total again
        System.out.println("\n\n*************\n\n");
 
 
 //here I would like to print out a test to be sure that the sum of the array 
        //is correct before I alter my program.
 
 
    }//end main
 
 
    //I had created the method to sum the array here but it did not work either
 
 
 
    }//end class

Please Edit your post and wrap your code with
[code=java]
<YOUR CODE HERE>
[/code]
to get highlighting and preserve formatting.

a method sum the totals

Where are the totals that you want to sum? If they are in an array, the normal way to sum the contents of an array is to use a loop that iterates over the contents of the array indexing one element each time through the loop.

way to add this to the array

The normal way to get user input and add it to an array is to use a loop. Inside the loop ask the user for the input, check for valid data and then store the data in an element of the array that is indexed by a variable. There needs to be a way for the user to exit the loop.

there is no method to do so

Can you change the existing method or write a new one that takes the data type you want to use?

Post the code and ask questions about the problems you are having.
I have no idea what your last post means.