Stupid beginner Mistake, Can you help?

Hello everyone. So I am trying to learn how to program in Java. I am completely self taught, so I predict I will be consulting this site a lot more from now on.

The program I have to make is:

Code:

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(Invoice Class) Create a class called Invoice that a hardware store might use to represent
an invoice for an item sold at the store. An Invoice should include four pieces of information as
instance variables—a part number (type String), a part description (type String), a quantity of the
item being purchased (type int) and a price per item (double). Your class should have a constructor
that initializes the four instance variables. Provide a set and a get method for each instance variable.
In addition, provide a method named getInvoiceAmount that calculates the invoice amount (i.e.,
multiplies the quantity by the price per item), then returns the amount as a double value. If the
Making a Difference 101
quantity is not positive, it should be set to 0. If the price per item is not positive, it should be set to
0.0. Write a test application named InvoiceTest that demonstrates class Invoice’s capabilities.

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So this is what I wrote:

Code:

---

       
public class Invoice{
       
        private String number;
       
                public void setNumber(String num)
                {
                        number = num;
                }
               
                public String getNumber()
                {
                        return number;
                }
               
       
        private String description;
               
                public void setDescription(String desc)
                {
               
                        description = desc;
                }
               
                public String getDescription()
                {
                        return description;
                }
               
        private int Amount;
                       
                public void setAmount(int amo)
                {
                        Amount = amo;
                }
               
                public int getAmount()
                {
                        return Amount;
                }
                       
        private double Price;
               
                public void setPrice(double pri)
                {
                        Price = pri;
                }
               
                public double getPrice()
                {
                        return Price;
                }
               
        private double InvoiceAmount;
       
                public void setInvoiceAmount(double IA)
                {
                        InvoiceAmount = (Price*Amount);
                }
               
                public double getInvoiceAmount()
                {
                        return InvoiceAmount;
                }
       
     
}

---

And the test is

Code:

---

import java.util.Scanner;


        public class InvoiceTest{

                public static void main(String[]args)
                {
               
                        Scanner input = new Scanner(System.in);
                       
                        Invoice Drill = new Invoice();
                        Invoice Hose = new Invoice();
                        Invoice Wood = new Invoice();
                        Invoice Bulb = new Invoice();
                       
 
               
               
                Drill.setPrice = 94.00;
                Hose.setPrice = 4.50;
                Wood.setPrice = 8.32;
                Bulb.setPrice = -3.9999;
               
                Drill.setNumber = QWERTY32;
                Hose.setNumber = QWOPLOL9;
                Wood.setNumber = JIZZPNTZ;
                Bulb.setNumber = YUNOCOST;
               
                Drill.setDescription = Jizz;
                Hose.setDescription = in;
                Wood.setDescription = my;
                Bulb.setDescription = pants;
               
                if (Drill.Price < 0)
                    Drill.setPrice = 0;
               
                if (Hose.Price < 0)
                    Hose.setPrice = 0;
               
                if (Wood.Price < 0)
                    Wood.setPrice = 0;
               
                if (Bulb.Price < 0)
                    Wood.setPrice = 0;
               
               
        System.out.printf("\n\nPrice for Drills is: $%.2f.\n\nPrice for Hoses is: $%.2f.\n\nPrice for Wood is: $%.2f.\n\nPrice for Bulbs is: $%.2f.",
                Drill.getPrice, Hose.getPrice, Wood.getPrice, Bulb.getPrice);
        System.out.println();
        System.out.println();
       
        System.out.printf("Drill: %s", Drill.getDescription);
        System.out.println();
        System.out.printf("Hose: %s", Hose.getDescription);
        System.out.println();
        System.out.printf("Wood: %s", Wood.getDescription);
        System.out.println();
        System.out.printf("Bulb: %s", Bulb.getDescription);
        System.out.println();
       
       
        System.out.print("How many Drills would you like? ");
        Drill.setAmount = input.nextInt();
        System.out.println();
       
        System.out.print("How many Hoses would you like? ");
        Hose.setAmount = input.nextInt();
        System.out.println();
       
        System.out.print("How many Tiles of Wood would you like? ");
        Wood.setAmount = input.nextInt();
        System.out.println();
       
        System.out.print("How many bulbs would you like? ");
        Bulb.setAmount = input.nextInt();
        System.out.println();
       
        System.out.println("Number        Object    Amount  Total");
        System.out.print("%s    Drill    %.2f    $%.2f", Drill.getNumber,
                Drill.getAmount, Drill.getInvoiceAmount);
        System.out.println();
       
        System.out.print("%s    Hose      %.2f    $%.2f", Hose.getNumber,
                Hose.getAmount, Hose.getInvoiceAmount);
        System.out.println();
       
        System.out.print("%s    Wood      %.2f    $%.2f", Wood.getNumber,
                Wood.getAmount, Wood.getInvoiceAmount);
        System.out.println();
       
        System.out.print("%s    Bulb      %.2f    $%.2f", Bulb.getNumber,
                Bulb.getAmount, Bulb.getInvoiceAmount);
        System.out.println();
       
        System.out.print("Grand Total:                      $%.2f", Sum);
       
       
        Sum = Drill.InvoiceAmount + Hose.InvoiceAmount + Wood.InvoiceAmount + Bulb.InvoiceAmount;
       
       
}
}

---

I would appreciate any help possible. I am getting some errors while compiling. Mostly some problem with symbols and my objects:

Code:

---

C:\Programs>javac Invoice.java InvoiceTest.java
InvoiceTest.java:21: error: cannot find symbol
                Drill.setPrice = 94.00;
                    ^
  symbol:  variable setPrice
  location: variable Drill of type Invoice
InvoiceTest.java:22: error: cannot find symbol
                Hose.setPrice = 4.50;
                    ^
  symbol:  variable setPrice
  location: variable Hose of type Invoice
InvoiceTest.java:23: error: cannot find symbol
                Wood.setPrice = 8.32;
                    ^
  symbol:  variable setPrice
  location: variable Wood of type Invoice
InvoiceTest.java:24: error: cannot find symbol
                Bulb.setPrice = -3.9999;
                    ^
  symbol:  variable setPrice
  location: variable Bulb of type Invoice
InvoiceTest.java:26: error: cannot find symbol
                Drill.setNumber = QWERTY32;
                    ^
  symbol:  variable setNumber
  location: variable Drill of type Invoice
InvoiceTest.java:26: error: cannot find symbol
                Drill.setNumber = QWERTY32;
                                  ^
  symbol:  variable QWERTY32
  location: class InvoiceTest
InvoiceTest.java:27: error: cannot find symbol
                Hose.setNumber = QWOPLOL9;
                    ^
  symbol:  variable setNumber
  location: variable Hose of type Invoice
InvoiceTest.java:27: error: cannot find symbol
                Hose.setNumber = QWOPLOL9;
                                ^
  symbol:  variable QWOPLOL9
  location: class InvoiceTest
InvoiceTest.java:28: error: cannot find symbol
                Wood.setNumber = JIZZPNTZ;
                    ^
  symbol:  variable setNumber
  location: variable Wood of type Invoice
InvoiceTest.java:28: error: cannot find symbol
                Wood.setNumber = JIZZPNTZ;
                                ^
  symbol:  variable JIZZPNTZ
  location: class InvoiceTest
InvoiceTest.java:29: error: cannot find symbol
                Bulb.setNumber = YUNOCOST;
                    ^
  symbol:  variable setNumber
  location: variable Bulb of type Invoice
InvoiceTest.java:29: error: cannot find symbol
                Bulb.setNumber = YUNOCOST;
                                ^
  symbol:  variable YUNOCOST
  location: class InvoiceTest
InvoiceTest.java:31: error: cannot find symbol
                Drill.setDescription = Jizz;
                    ^
  symbol:  variable setDescription
  location: variable Drill of type Invoice
InvoiceTest.java:31: error: cannot find symbol
                Drill.setDescription = Jizz;
                                      ^
  symbol:  variable Jizz
  location: class InvoiceTest
InvoiceTest.java:32: error: cannot find symbol
                Hose.setDescription = in;
                    ^
  symbol:  variable setDescription
  location: variable Hose of type Invoice
InvoiceTest.java:32: error: cannot find symbol
                Hose.setDescription = in;
                                      ^
  symbol:  variable in
  location: class InvoiceTest
InvoiceTest.java:33: error: cannot find symbol
                Wood.setDescription = my;
                    ^
  symbol:  variable setDescription
  location: variable Wood of type Invoice
InvoiceTest.java:33: error: cannot find symbol
                Wood.setDescription = my;
                                      ^
  symbol:  variable my
  location: class InvoiceTest
InvoiceTest.java:34: error: cannot find symbol
                Bulb.setDescription = pants;
                    ^
  symbol:  variable setDescription
  location: variable Bulb of type Invoice
InvoiceTest.java:34: error: cannot find symbol
                Bulb.setDescription = pants;
                                      ^
  symbol:  variable pants
  location: class InvoiceTest
InvoiceTest.java:36: error: Price has private access in Invoice
                if (Drill.Price < 0)
                        ^
InvoiceTest.java:37: error: cannot find symbol
                    Drill.setPrice = 0;
                        ^
  symbol:  variable setPrice
  location: variable Drill of type Invoice
InvoiceTest.java:39: error: Price has private access in Invoice
                if (Hose.Price < 0)
                        ^
InvoiceTest.java:40: error: cannot find symbol
                    Hose.setPrice = 0;
                        ^
  symbol:  variable setPrice
  location: variable Hose of type Invoice
InvoiceTest.java:42: error: Price has private access in Invoice
                if (Wood.Price < 0)
                        ^
InvoiceTest.java:43: error: cannot find symbol
                    Wood.setPrice = 0;
                        ^
  symbol:  variable setPrice
  location: variable Wood of type Invoice
InvoiceTest.java:45: error: Price has private access in Invoice
                if (Bulb.Price < 0)
                        ^
InvoiceTest.java:46: error: cannot find symbol
                    Wood.setPrice = 0;
                        ^
  symbol:  variable setPrice
  location: variable Wood of type Invoice
InvoiceTest.java:50: error: cannot find symbol
                Drill.getPrice, Hose.getPrice, Wood.getPrice, Bulb.getPrice);
                    ^
  symbol:  variable getPrice
  location: variable Drill of type Invoice
InvoiceTest.java:50: error: cannot find symbol
                Drill.getPrice, Hose.getPrice, Wood.getPrice, Bulb.getPrice);
                                    ^
  symbol:  variable getPrice
  location: variable Hose of type Invoice
InvoiceTest.java:50: error: cannot find symbol
                Drill.getPrice, Hose.getPrice, Wood.getPrice, Bulb.getPrice);
                                                  ^
  symbol:  variable getPrice
  location: variable Wood of type Invoice
InvoiceTest.java:50: error: cannot find symbol
                Drill.getPrice, Hose.getPrice, Wood.getPrice, Bulb.getPrice);
                                                                  ^
  symbol:  variable getPrice
  location: variable Bulb of type Invoice
InvoiceTest.java:54: error: cannot find symbol
        System.out.printf("Drill: %s", Drill.getDescription);
                                            ^
  symbol:  variable getDescription
  location: variable Drill of type Invoice
InvoiceTest.java:56: error: cannot find symbol
        System.out.printf("Hose: %s", Hose.getDescription);
                                          ^
  symbol:  variable getDescription
  location: variable Hose of type Invoice
InvoiceTest.java:58: error: cannot find symbol
        System.out.printf("Wood: %s", Wood.getDescription);
                                          ^
  symbol:  variable getDescription
  location: variable Wood of type Invoice
InvoiceTest.java:60: error: cannot find symbol
        System.out.printf("Bulb: %s", Bulb.getDescription);
                                          ^
  symbol:  variable getDescription
  location: variable Bulb of type Invoice
InvoiceTest.java:65: error: cannot find symbol
        Drill.setAmount = input.nextInt();
            ^
  symbol:  variable setAmount
  location: variable Drill of type Invoice
InvoiceTest.java:69: error: cannot find symbol
        Hose.setAmount = input.nextInt();
            ^
  symbol:  variable setAmount
  location: variable Hose of type Invoice
InvoiceTest.java:73: error: cannot find symbol
        Wood.setAmount = input.nextInt();
            ^
  symbol:  variable setAmount
  location: variable Wood of type Invoice
InvoiceTest.java:77: error: cannot find symbol
        Bulb.setAmount = input.nextInt();
            ^
  symbol:  variable setAmount
  location: variable Bulb of type Invoice
InvoiceTest.java:81: error: cannot find symbol
        System.out.print("%s    Drill    %.2f    $%.2f", Drill.getNumber,
                                                                ^
  symbol:  variable getNumber
  location: variable Drill of type Invoice
InvoiceTest.java:82: error: cannot find symbol
                Drill.getAmount, Drill.getInvoiceAmount);
                    ^
  symbol:  variable getAmount
  location: variable Drill of type Invoice
InvoiceTest.java:82: error: cannot find symbol
                Drill.getAmount, Drill.getInvoiceAmount);
                                      ^
  symbol:  variable getInvoiceAmount
  location: variable Drill of type Invoice
InvoiceTest.java:85: error: cannot find symbol
        System.out.print("%s    Hose      %.2f    $%.2f", Hose.getNumber,
                                                              ^
  symbol:  variable getNumber
  location: variable Hose of type Invoice
InvoiceTest.java:86: error: cannot find symbol
                Hose.getAmount, Hose.getInvoiceAmount);
                    ^
  symbol:  variable getAmount
  location: variable Hose of type Invoice
InvoiceTest.java:86: error: cannot find symbol
                Hose.getAmount, Hose.getInvoiceAmount);
                                    ^
  symbol:  variable getInvoiceAmount
  location: variable Hose of type Invoice
InvoiceTest.java:89: error: cannot find symbol
        System.out.print("%s    Wood      %.2f    $%.2f", Wood.getNumber,
                                                              ^
  symbol:  variable getNumber
  location: variable Wood of type Invoice
InvoiceTest.java:90: error: cannot find symbol
                Wood.getAmount, Wood.getInvoiceAmount);
                    ^
  symbol:  variable getAmount
  location: variable Wood of type Invoice
InvoiceTest.java:90: error: cannot find symbol
                Wood.getAmount, Wood.getInvoiceAmount);
                                    ^
  symbol:  variable getInvoiceAmount
  location: variable Wood of type Invoice
InvoiceTest.java:93: error: cannot find symbol
        System.out.print("%s    Bulb      %.2f    $%.2f", Bulb.getNumber,
                                                              ^
  symbol:  variable getNumber
  location: variable Bulb of type Invoice
InvoiceTest.java:94: error: cannot find symbol
                Bulb.getAmount, Bulb.getInvoiceAmount);
                    ^
  symbol:  variable getAmount
  location: variable Bulb of type Invoice
InvoiceTest.java:94: error: cannot find symbol
                Bulb.getAmount, Bulb.getInvoiceAmount);
                                    ^
  symbol:  variable getInvoiceAmount
  location: variable Bulb of type Invoice
InvoiceTest.java:97: error: cannot find symbol
        System.out.print("Grand Total:                      $%.2f", Sum);
                                                                    ^
  symbol:  variable Sum
  location: class InvoiceTest
InvoiceTest.java:100: error: cannot find symbol
        Sum = Drill.InvoiceAmount + Hose.InvoiceAmount + Wood.InvoiceAmount + Bu
lb.InvoiceAmount;
        ^
  symbol:  variable Sum
  location: class InvoiceTest
InvoiceTest.java:100: error: InvoiceAmount has private access in Invoice
        Sum = Drill.InvoiceAmount + Hose.InvoiceAmount + Wood.InvoiceAmount + Bu
lb.InvoiceAmount;
                  ^
InvoiceTest.java:100: error: InvoiceAmount has private access in Invoice
        Sum = Drill.InvoiceAmount + Hose.InvoiceAmount + Wood.InvoiceAmount + Bu
lb.InvoiceAmount;
                                        ^
InvoiceTest.java:100: error: InvoiceAmount has private access in Invoice
        Sum = Drill.InvoiceAmount + Hose.InvoiceAmount + Wood.InvoiceAmount + Bu
lb.InvoiceAmount;
                                                            ^
InvoiceTest.java:100: error: InvoiceAmount has private access in Invoice
        Sum = Drill.InvoiceAmount + Hose.InvoiceAmount + Wood.InvoiceAmount + Bu
lb.InvoiceAmount;

  ^
58 errors

---

Sorry, I know this is probably trivial for this kind of forum. But I really have no one else to turn to for help. ANY help would be appreciated. Thank you very much! Have a nice day.

I defined (Sum) I just realized I hadn't (as a double). Still pretty much the same problems.

Check up on how to call methods, you are using assing operation as if directly setting variable values.

SomeClass someInstance=new SomeClass(some pararms, or none);
someInstance.someVariable=newValue; // assigning variable value
someInstance.someSetMethod(newValue) //calling a method.

Consult Sun´s java tutorials. There are also a number of great online books available, such as "Tninking in Java".

Oh man.. this syntax belongs to no language...

Here is my suggestion. Buy yourself a book, there would be example programs to start with, write those programs (if you're not interested in studying the subjective) compile them and test them. But don't copy paste those programs..


we use setPrice(8.32) to call set price function not setPrice = 8.32; get it??? You need a book!!! go to a library....

Quote:

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we use setPrice(8.32) to call set price function not setPrice = 8.32; get it??? You need a book!!! go to a library....

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Hey, give the OP a break, he/she is asking their first question here apart from which Londbrok has already given the OP this advice but in a much more sympathetic way.

If the OP doesn't take the advice and repeatedly posts similar questions then by all means take a more direct approach but they deserve a chance before being ridiculed.