[Fuzzyness]

shopping p = new shopping(pname,pprice,pbarcode,0 ,0 ,0);
You are sending it 3 variables and then 3 0's. You constructor..
shopping(String pname, String pbarcode, double pprice, int pquantity)
Calls for the 3 variables, and then 1 int quantity, you need to change those 3 0's to 1 and make it a value that isn't 0 otherwise you will be trying to purchase 0 of that item.

[shannon_p]

okay guys obviously I am not good at programming I have so many questions. I believe I found the way to get my items to save to a text file. But I am really confused about my barcode. It's supposed to be numbers such as 111 or 222. So is my barcode supposed to be a string or an int. When I have it is a string in certain parts it says requires an int, then I change it and everything gets messed up. So is barcode an int or a string?

[Fuzzyness]

Well, it is up to you. You can make it a String and when you need it to be an int you can just call Integer.parseInt(barcode) or you can make it an int, and when you need to use it as a String just do barcode+""; to concatnate it.

All depends on what you want, both can work just have to do the proper work around.

[shannon_p]

okay I am getting an error here

               pbarcode = Integer.parseInt(pbarcode);

So I'm trying to get an int it keeps saying requires sting.

[Fuzzyness]

Break down: pbarcode = Integer.parseInt(pbarcode);

pbarcode - This is a String
Integer.parseInt(pbarcode) - This is a String you are making into an int

String != int

You need to assign it to a variable that isn't a String...

You use pbarcode in both. So you need to change it so it is assigned to a different variable...

int iBarCode = Integer.parseInt(pbardcode);
iBarCode is an int and pbarcode is a String, you make pbarCode value into an int through the parseInt method and assign that value to iBarCode.

This post has been edited by Fuzzyness: 15 November 2011 - 11:52 AM

[shannon_p]

Okay thanks that fixed the error. But now I forgot to add in the price section for the item so I just added that and now my program closes after the input barcode section.

sinput = JOptionPane.showInputDialog("Enter the price of that item");
                    pprice = Double.parseDouble(sinput);
                    p.setprice(pprice);
                    i++;
                    resp = JOptionPane.showInputDialog("Enter another item? 1: yes 0: no");
                    cmd = Integer.parseInt(resp);

so it doesn't even go to price it just ends the program nor does it let me enter another item. Here is the error its giving me
Exception in thread "main" java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:454)
at java.lang.Integer.parseInt(Integer.java:527)
at program7.Program7.main(Program7.java:42)

I don't know what that means.... Java's really upsetting me

[Fuzzyness]

Repost all of your code so that we know what it looks like now. it is a learning process no worries, everything is difficult at first.

[shannon_p]

Okay here is my class

class shopping {
    private String name;
    private double price;
    private String barcode;
    private int quantity;
    public shopping(){
        name = "not valid";
        price = 0;
        barcode = "unknown";
        quantity =0;
    }

    shopping(String pname, String pbarcode, double pprice, int pquantity) {
        name = pname;
        barcode = pbarcode;
        price = pprice;
        quantity = pquantity;
        this.add(quantity);
        this.buy(quantity);
        
    }
   
    
    public void setname(String item){
        name = item;
    }
    public String getname(){
        return name;
    }
    public void setprice(double cost){
        cost = price;
    }
    public double getprice(){
        return price;
    }
    public void setbar(String bar){
        bar = barcode;
    }
    public String getbar(String bar){
        return barcode;
    }
    public void setquantity(double num){
        num = quantity;
    }
    public double getquantity(){
        return quantity;
    }
    public void add(int amt){
        quantity = quantity + amt;
    }
    public double add(){
        return quantity;
    }
    public void buy(int amt){
        quantity = quantity - amt;
    }
    public double buy(){
        return quantity;
    }

   
    }

and here is my program

public static void main(String[] args) {
        shopping [] shop = new shopping[100];
        PrintWriter ofile = null;
        String pname = null;
        double pprice;
        String pbarcode = null;
        int ibarcode = 0;
        int pquantity = 0;
        int cmd, size = 0;
        boolean done;
        shopping p = new shopping();    
        String resp = JOptionPane.showInputDialog( "Choose from:" +
                "\n1: Add new products\n2: Shop\n3: Check out ");
        cmd = Integer.parseInt(resp);
        String sinput = null;
        switch(cmd){
        case 1: done = false;
              int i = 0;
               while(!done){                  
                sinput = JOptionPane.showInputDialog("Enter the product name");                          
                p.setname(sinput);
                sinput = JOptionPane.showInputDialog("Enter the quantity of that product");
                    pquantity = Integer.parseInt(sinput);
                    p.setquantity(pquantity);
                sinput = JOptionPane.showInputDialog("Enter the barcode");
                    ibarcode = Integer.parseInt(pbarcode);
                    p.setbar(pbarcode);
                sinput = JOptionPane.showInputDialog("Enter the price of that item");
                    pprice = Double.parseDouble(sinput);
                    p.setprice(pprice);
                    i++;
                    resp = JOptionPane.showInputDialog("Enter another item? 1: yes 0: no");
                    cmd = Integer.parseInt(resp);
                    if(cmd == 0)
                        done = true;
                    size = i;
                    
                      }
                    resp = JOptionPane.showInputDialog("enter name of file for this store");

                    try {
                        ofile = new PrintWriter(new File(resp));
                    }
                    catch(FileNotFoundException e){
                        System.out.println("Could not open file");
                    }
                    for(i = 0; i < size; i++){
                        ofile.println(shop[i].getname());
                        ofile.println(shop[i].getprice());
                        ofile.println(shop[i].getbar(resp));
                    }
                    ofile.close();
                break;
            
        case 2: JOptionPane.showInputDialog("Enter the barcode of the item you would like to buy");
            resp = p.getbar(resp);
            JOptionPane.showInputDialog("Enter how many you would like to buy");
             pquantity = Integer.parseInt(sinput);
                    
        }
    }
}

[Fuzzyness]

public void setprice(double cost){
        cost = price;
    }

Shouldn't that be price = cost;?

String pbarcode = null;
ibarcode = Integer.parseInt(pbarcode);

I think you mean to replace pbarcode with sinput: sinput = JOptionPane.showInputDialog("Enter the barcode");

[shannon_p]

okay i changed that error in my class but its still stopping after input barcode

[Fuzzyness]

Does the line look like this: ibarcode = Integer.parseInt(sinput);

[shannon_p]

Yes my code does look like that. I don't know what happened. I added the price feature and now it won't run.

[shannon_p]

Okay I have another question. While shopping the program is supposed to keep track of how many items there are and how many items have been bought. So I set buy in my class to subtract the amount but I am not sure how to incorporate this into my program. Help?