need help with writing this program

[nickans]

1 Create a java file in NetBeans, name it Catalog.java.
2 Create one String array to store 3 products for a catalogue
3 Create the appropriate variables to store the product name, product code and product price.
4 At the start of the program display the catalogue for the user by looping through the array and outputting it to the screen with a number listing for each product, as shown above
5 Create an infinite loop to enter orders; to stop the loop the user should enter 0.
6 Keep a running total (accumulator) of all products amount total and sub-total (multiple accumulators)
7 Write a method to calculate the taxes and return a grand total
8 Write another method to print out the order as listed above

hadda look like this

Our catalogue [Product Codes in brackets]:

(1) Condensed Milk [M3487], $9.50 per can.
(2) Distilled Water [W3876], $3.00 a bottle.
(3) Pack Rice [R9983], $12.75 for 5lbs.
Buy something!

Enter Order Number (0 to stop): M3487
Enter Quantity: 2
Enter Order Number (0 to stop): W3876
Enter Quantity: 3
Enter Order Number (0 to stop): R9983
Enter Quantity: 3
Enter Order Number (0 to stop): 0

--- Update ---

this is the code i have so far

its not entering the if statement...can anyone help??

package catalog;
 
import java.util.*;
 
public class Catalog {
 
   static String products[] = new String[3];
   static int answer;
 
    public static void main(String[] args) {
 
             System.out.println("------------------");
             System.out.println("Shopping Catalog");
             System.out.println("------------------");
 
              String[] pCode = new String[3];
              float pPrice[] = new float[3];
              int orderNum = 0;
              int quantity=0;
 
             Scanner s = new Scanner(System.in);
             System.out.println("------------------------------------------");
                System.out.println("condensed milk [M3487], $9.50 per can.");
                    System.out.println("");
                System.out.println("Distilled Water [W3876], $3.00 a bottle.");
                    System.out.println("");
                System.out.println("Pack Rice [R9983], $12.75 for 5lbs.");
             System.out.println("------------------------------------------");
 
 
 
 
                do{
 
                         System.out.println("Please enter order number (0 to stop)");
                                    pCode[orderNum] = s.nextLine();
 
                                            if(pCode[orderNum] == "M3487"){
                                                System.out.println("condensed milk $9.50");
                                                    System.out.println("Enter Quantity");
                                                        quantity = s.nextInt();
                                            }//close if statement
                                            orderNum++;
                     if(answer == 0){
                         break;
                     }//close if
                }while(true);//close while loop
 
    }//close main method
 
}//close class

[dicdic]

I think if(pCode[orderNum] == "M3487") is the if statement you are talking about.
The reason is pCode[0] - pCode[n] has a value of "null" (String "null" not null pointer).
why? because you never declare the value of each element. you just declared an array of String.

[GregBrannon]

nickans, you've been asked: Please post your code correctly. If uncertain how, please review this link.

[nickans]

[QUOTE=nickans;147057]1 Create a java file in NetBeans, name it Catalog.java.
2 Create one String array to store 3 products for a catalogue
3 Create the appropriate variables to store the product name, product code and product price.
4 At the start of the program display the catalogue for the user by looping through the array and outputting it to the screen with a number listing for each product, as shown above
5 Create an infinite loop to enter orders; to stop the loop the user should enter 0.
6 Keep a running total (accumulator) of all products amount total and sub-total (multiple accumulators)
7 Write a method to calculate the taxes and return a grand total
8 Write another method to print out the order as listed above

hadda look like this

Our catalogue [Product Codes in brackets]:

(1) Condensed Milk [M3487], $9.50 per can.
(2) Distilled Water [W3876], $3.00 a bottle.
(3) Pack Rice [R9983], $12.75 for 5lbs.
Buy something!

Enter Order Number (0 to stop): M3487
Enter Quantity: 2
Enter Order Number (0 to stop): W3876
Enter Quantity: 3
Enter Order Number (0 to stop): R9983
Enter Quantity: 3
Enter Order Number (0 to stop): 0

--- Update ---

this is the code i have so far

its not entering the if statement...can anyone help??

package catalog;
 
import java.util.*;
 
public class Catalog {
 
   static String products[] = new String[3];
   static int answer;
 
    public static void main(String[] args) {
 
             System.out.println("------------------");
             System.out.println("Shopping Catalog");
             System.out.println("------------------");
 
              String[] pCode = new String[3];
              float pPrice[] = new float[3];
              int orderNum = 0;
              int quantity=0;
 
             Scanner s = new Scanner(System.in);
             System.out.println("------------------------------------------");
                System.out.println("condensed milk [M3487], $9.50 per can.");
                    System.out.println("");
                System.out.println("Distilled Water [W3876], $3.00 a bottle.");
                    System.out.println("");
                System.out.println("Pack Rice [R9983], $12.75 for 5lbs.");
             System.out.println("------------------------------------------");
 
 
 
 
                do{
 
                         System.out.println("Please enter order number (0 to stop)");
                                    pCode[orderNum] = s.nextLine();
 
                                            if(pCode[orderNum] == "M3487"){
                                                System.out.println("condensed milk $9.50");
                                                    System.out.println("Enter Quantity");
                                                        quantity = s.nextInt();
                                            }//close if statement
                                            orderNum++;
                     if(answer == 0){
                         break;
                     }//close if
                }while(true);//close while loop
 
    }//close main method
 
}//close class

[GregBrannon]

Wasn't this answer provided in your other thread? Have you lost track, or am I remembering incorrectly? Multiple threads on the same topic end up wasting time and causing confusion so are discouraged.

[nickans]

yes it was, the other thread was solved. i'm confused as to where should i go from here. That's why i posted it here with additional information

[nickans]

so i've gotten this far, but i cant get a grand total. can anyone help with it??

 
package catalog;
 
 
import java.util.*;
public class Catalog1 {
    private static final String[] products = new String[3];
   private static float total=0.0f; 
   private static final float tax = 15/100;
   private static final float[] subTotal = new float[3];
   private static final float[] itemTotal = new float[3];
   private static final double[]pPrice = new double[3];
   private static String []pCode = new String[10];
    public static void main(String[] args) {
            products[0] = "Condensed Milk"; 
             products[1] = "Distilled Water";
             products[2] = "Packed rice";
             pPrice[0] = (9.50);
             pPrice[1] = (3.00);
             pPrice[2] = (12.75);
            int quantity = 0;
            int orderNum = 0;
         Scanner s = new Scanner(System.in);  
 
 
 
             do{ 
                    System.out.println("------------------------------------------");
                    System.out.println("condensed Milk[M3487], $9.50 per can.");
                    System.out.println("");
                    System.out.println("Distilled Water [W3876], $3.00 a bottle.");
                    System.out.println("");
                    System.out.println("packed Rice [R9983], $12.75 for 5lbs.");
                    System.out.println("------------------------------------------");
 
                         System.out.println("Please enter order number (0 to stop)");
                                    pCode[orderNum] = s.nextLine();
 
                                            if(pCode[orderNum].equals("M3487")){
                                                System.out.println("condensed Milk $9.50");
                                                    System.out.println("Enter Quantity");
                                                        quantity = s.nextInt();
                                                           itemTotal[0] = (float) (pPrice[0]*quantity); 
                                     System.out.println(quantity + " condensed Milk @ $9.50 = $" + itemTotal[0]);
 
                                            }else if(pCode[orderNum].equals("W3876")){
                                                 System.out.println("Distilled Water $3.00");
                                                    System.out.println("Enter Quantity");
                                                        quantity = s.nextInt();
                                                            itemTotal[1] = (float) (pPrice[1] * quantity);
                                        System.out.println(quantity +" Distilled Water @ 3.00 = $" + pPrice[1]*quantity);
 
                                            }else if(pCode[orderNum].equals("R9983")){
                                                 System.out.println("packed Rice $12.75");
                                                   System.out.println("Enter Quantity");
                                                       quantity = s.nextInt();
                                                            itemTotal[2] = (float) (pPrice[2] * quantity);
                                         System.out.println(quantity +" Distilled Water @ 3.00 = $" + pPrice[2]*quantity);
 
                                                }else if(pCode[orderNum].equals("0")){
                                                    System.out.println("your total bill is $" + total);
                                                    break;
                                                }//close if statement
                                            orderNum++;
                                            quantity++;
 
 
                }while(true);//close while loop
 
    }
    public static float totalBill() {
 
 
               subTotal[0] = itemTotal[0] * tax;
               total = subTotal[0] + subTotal[1] + subTotal[2] + itemTotal[0] + itemTotal[1] + itemTotal[2];
		return total ; 
 
	}//close bill method
}

[GregBrannon]

What terms are included in the grand total? Once you've determined the answer to that, add those terms together and print them in a statement as the Grand Total = result.

[nickans]

i got it.. problem was that i wasn't calling it in main. but a new problem arrived, after i enter the product code and quantity, the menu appears twice.

[GregBrannon]

So the logic to leave whatever loop the code is in at the time isn't working. Review that logic and fix it.

There's probably a better way than a do/while( true ) loop to present the menu. I'm mostly prejudiced agains while ( true ) loops of any kind, so if it's working for you, ignore me. But there's a better way.

[nickans]

instead of the while(true)..what would u use??

[GregBrannon]

A deterministic approach that applies logic rather than accepting a default result that must be broken out of.

[nickans]

having it in an infinite loop was within the specification of the assignment.