two simple troubles.

[ken zemaitis]

 
 
// Make it possible to use required packaged code
 
import java.util.*;
import java.io.*;
import java.text.*;
 
// This class defines a program to process orders for a fast food restaurant.
 
 
public class Project02 {
 
  // This method begins application processing.
 
  public static void main(String[] args) {
 
    // Variables.
 
    double taxRate;             // For holding the tax rate.
    String reply;               // For holding the user's latest keyboard entry.
    ArrayList quantities;       // For holding the item quantities for the
                                // customer order.
 
    // These coordinated arrays hold item names and their prices
 
    String[] items = {"Burgers", "Fries", "Drinks"};
    double[] prices = {2.75, 1.50, 1.35};
 
    // If the program did not receive a command line parameter, set the
    // tax rate to .06 (meaning 6%). Otherwise, set the tax rate to the
    // value of the parameter.
 
    if (args.length == 0) {
      taxRate = .06;
    }
    else {
      String taxRateAsString = reply;      // GET PARAMETER VALUE.
      taxRate = Integer.parseInt(taxRateAsString);  // CONVERT FROM String TO int.            //GOOD TO HERE.
    }
 
    // Loop to process one customer order.
 
    do {
 
      // Display item names and prices.
 
      System.out.println("");
      System.out.println("--------- ITEMS AND PRICES ---------");
      System.out.println("");
 
      // THIS LOOP SHOULD DISPLAY ITEM NAMES AND PRICES IN A FORMAT THAT
      // MATCHES THE SAMPLE OUTPUT SHOWN BELOW.
 
      for (int i = 0; i < items.length; i++) {    // LIMIT BY SIZE OF items ARRAY.
        System.out.println(" " + items[i] + "..." + Utility.moneyFormat(prices[i]));
      }
 
      // Get order data.
 
      System.out.println("");
      System.out.println("------------ YOUR ORDER ------------");
      System.out.println("");
      quantities = new ArrayList();
 
      // THIS LOOP SHOULD PROMPT FOR AND READ THE NUMBER OF EACH ITEM THE
      // CUSTOMER WANTS TO BUY. IT SHOULD MATCH THE FORMAT OF THE SAMPLE
      // OUTPUT SHOWN BELOW.
 
      for (int i = 0; i < items.length; i++) {    // LIMIT BY SIZE OF items ARRAY.
        System.out.print(" Number of " + items[i] + ": ");
        reply = Utility.readString();
        quantities.add(reply);    // ADD TO THE quantities ArrayList.
      }
 
      // Calculate and display "Payment Due" information.
 
      System.out.println("");
      System.out.println("----------- PAYMENT DUE ------------");
      System.out.println("");
      double subtotal = calculate(prices, quantities);
      System.out.println(" Subtotal: " + Utility.moneyFormat(subtotal));
      double tax = subtotal * taxRate;
      System.out.println(" Tax: " + Utility.moneyFormat(tax) +
                         " at " + Utility.percentFormat(taxRate));  // SHOW taxRate AS A FORMATTED PERCENTAGE.
      double totalDue = subtotal + tax;
      System.out.println(" TOTAL: " + Utility.moneyFormat(totalDue));
 
      // Ask the user if they want to process another order. If they reply with
      // a String whose value is "YES", repeat this loop.
 
      System.out.println("");
      System.out.println("-------------- AGAIN? --------------");
      System.out.println("");
      System.out.print(" Enter YES to do another order: ");
      reply = Utility.readString();
    } while (reply.toLowerCase().equals("yes"));  // ACCEPT "YES" IN ANY CASE (SUCH AS "yes") TO CONTINUE.
  }
 
  // This method can be called to calculate the non-taxable amount due for
  // an order. It receives the array of prices and ArrayList of corresponding
  // quantities as parameters.
 
  public static double calculate(double[] prices, ArrayList quantities) {
    double total = 0;
    for (int i = 0; i < prices.length(); i++) {// LIMIT BY SIZE OF THE ARRAY.**********
      double price = prices[i];    // GET THE ITEM'S PRICE.
      int quantity = quantities.get(i);    // GET THE CORRESPONDING QUANTITY ORDERED.**********
      double extendedPrice = price * quantity;
      total += extendedPrice;
    }
    return total;
  }
}
 
// This class contains custom methods that support application processing.
// ----- Written by: Jon Huhtala
 
class Utility {
  private static BufferedReader kbReader =
    new BufferedReader(new InputStreamReader(System.in));
 
  // This method read a String value from the keyboard.
 
  public static String readString() {
    String result = null;
    while (result == null) {
      try {
        result = kbReader.readLine();
      }
      catch(Exception err) {
        System.out.print("ERROR! Please try again: ");
      }
    }
    return result;
  }
 
  // This method converts a double to a formatted currency String.
  // For example: 1234.56 --> "$1,234.56"
 
  public static String moneyFormat(double amount) {
    return NumberFormat.getCurrencyInstance().format(amount);
  }
 
  // This method converts a double to a formatted percentage String
  // having exactly one decimal place.
  // For example: .075 --> "7.5%"
 
  public static String percentFormat(double amount) {
    NumberFormat nf = NumberFormat.getPercentInstance();
    nf.setMaximumFractionDigits(1);
    nf.setMinimumFractionDigits(1);
    return nf.format(amount);
  }
}
 
 

The only two errors I am getting are denoted by "**********."

The first error I am getting gives me a different error message every time I modify the code. All I want is for the "prices.length" to limit "i."

The second error I am getting also tends to give me different messages. I am trying to define a variable based on an Array List. It is an int, but I need to extract values from an array list(quantities).

Any help or input anyone could provide would be great, thanks very much.
[ March 29, 2006: Message edited by: ken zemaitis ]

[fred rosenberger]

length is a property of the array, not a method.

try

for (int i = 0; i < prices.length; i++)

also, it would help in the future if you posted the EXACT error message you are getting with the code you are posting. those error messages tell you a lot...
[ March 29, 2006: Message edited by: fred rosenberger ]

[Mani Ram]

i) Note that the prices is an array. To find the length of an array, you need to use the length property, not the length() method

for (int i = 0; i < prices.length(); i++)//Wrong
for (int i = 0; i < prices.length; i++)//Right

ii) When you get something from a List, it always returns an Object. Looking at your code, it seems that you are adding a String to the array list. If that String represents an integer, you need to convert it accordingly (cast the Object to String and then convert it into an int).

int quantity = quantities.get(i); //Wrong
int quantity = Integer.parseInt ( (String) quantities.get(i) ); //Correct. Object to String to int

Hope that helps.
[ March 29, 2006: Message edited by: Mani Ram ]

[tayy abdelqader]

in addition to what Mani Ram said
you have

this
taxRate = Integer.parseInt(taxRateAsString);

it must be doube

taxRate = Double.parseDouble((String)taxRateAsString);
&
reply must be initialized

hope to be helped
[ March 29, 2006: Message edited by: tayy abdelqader ]