Inventory Java Project Help

[ITQUEST]

I am on the second step of my Inventory Project and can properly run my Inventory2.java file but not my Product2.java file. I get the following error: 71:cannot find symbol, symbol: method getItemTitle() location: class Product
returntitle.compareTo(p.getItemTitle());
^

Here is my code:

// Product2 class
 
import java.util.*;
 
class Product2 implements Comparable {
 
 
    private String title;       // class variable stores the item title
    private long number;      // class variable stores the item number
    private long stockQuantity;   // class variable stores the quantity in stock
    private double price;      // class variable stores the item price
 
    public Product2() {
            title = "";
        number = 0L;
        stockQuantity = 0L;
        price = 0.0;
    }
 
    public Product2(String title, long number, long stockQuantity, double price) {
        this.title = title;
        this.number = number;
        this.stockQuantity = stockQuantity;
        this.price = price;
       }
 
    public void setItemTitle(String title) {
        this.title = title;
    }
 
    public String getItemTitle() {
        return title;
    }
 
    public void setItemNumber(long number) {
        this.number = number;
    }
 
    public long getItemNumber() {
        return number;
    }
 
    public void setStockQuantity(long quantity) {
        stockQuantity = quantity;
    }
 
    public long getStockQuantity() {
        return stockQuantity;
    }
 
    public void setItemPrice(double price) {
        this.price = price;
    }
 
    public double getItemPrice() {
        return price;
    }
 
    public double calculateInventoryValue() {
        return price * stockQuantity;
    }
 
    public int compareTo (Object o) {
        Product p = null;
        try {
            p = (Product)o;
        }
        catch(ClassCastException cE) {
            cE.printStackTrace();
        }
        return title.compareTo(p.getItemTitle());
    }
 
    public String toString() {
        return "DVD Title: "+title + "\nNumber: "+number+"\nPrice: $"+price+"\nQuantity: "+stockQuantity + "\nValue: $"+calculateInventoryValue();
    }
 
} // end class Product2
 

Any suggestions? Thanks! ITQUEST

[horace1]

do you have a method getItemTitle() in Product? I can see a getItemName()? assuming I am looking at the latest version of Product!

[ITQUEST]

do you have a method getItemTitle() in Product? I can see a getItemName()? assuming I am looking at the latest version of Product!

Yes this is my latest version of Product2. I do not see a getItemName()...where do you see that? I guess I have been working so long I am getting confused. Do you see the error in my posted code?

Thanks for your help! ITQUEST

[horace1]

Yes this is my latest version of Product2. I do not see a getItemName()...where do you see that? I guess I have been working so long I am getting confused. Do you see the error in my posted code?

Thanks for your help! ITQUEST

it looks like the error is in

    public int compareTo (Object o) {
        Product p = null;
        try {
            p = (Product)o;
        }
        catch(ClassCastException cE) {
            cE.printStackTrace();
        }
        return title.compareTo(p.getItemTitle());
    }
 

in line

returntitle.compareTo(p.getItemTitle());
 

where p is an object of type Product which does not have a method getItemTitle() but - in the post I am looking at
http://www.thescripts.com/forum/thre...0714-8-10.html
has a method getItemName()

should p be an object of type Product2??

[ITQUEST]

it looks like the error is in

    public int compareTo (Object o) {
        Product p = null;
        try {
            p = (Product)o;
        }
        catch(ClassCastException cE) {
            cE.printStackTrace();
        }
        return title.compareTo(p.getItemTitle());
    }
 

in line

returntitle.compareTo(p.getItemTitle());
 

where p is an object of type Product which does not have a method getItemTitle() but - in the post I am looking at
http://www.thescripts.com/forum/thre...0714-8-10.html
has a method getItemName()

should p be an object of type Product2??

Yes I believe so. I changed that part of the code to read as this:

public int compareTo (Object o) {
Product2 p = null;
try {
p = (Product2)o;
}
catch(ClassCastException cE) {
cE.printStackTrace();
}
return title.compareTo(p.getItemTitle());
}

And tried to run it. It gives me the error: Exception in Thread "Main" java lang. NoSuchMethodError: main

ITQUEST

[horace1]

you need a main() method, something along the lines of

public static void main(String s[])
{
  Product2 p = new Product2();
  // more code????
}
 

[ITQUEST]

you need a main() method, something along the lines of

public static void main(String s[])
{
  Product2 p = new Product2();
  // more code????
}
 

I am not sure if I understand. I have changed the code in the beginning to look like this:

// Product2 class

import java.util.*;

public static void main (String args[])
Product2 p = new Product2();

class Product2 implements Comparable {


private String title; // class variable stores the item title
private long number; // class variable stores the item number
private long stockQuantity; // class variable stores the quantity in stock
private double price; // class variable stores the item price
...

And it doesn't work either. I think I am confusing myself more than I should be.
ITQUEST

[Ganon11]

Well, in order for you to execute a command like

java Product2

there has to be a function main() in the class, as horace said. You will use this main function to test out the class, etc. Alternatively, you may have been given a 'main' class to execute for testing, in which case you would use

java MainClass

instead of Product2.

[horace1]

I am not sure if I understand. I have changed the code in the beginning to look like this:

// Product2 class

import java.util.*;

public static void main (String args[])
Product2 p = new Product2();

class Product2 implements Comparable {


private String title; // class variable stores the item title
private long number; // class variable stores the item number
private long stockQuantity; // class variable stores the quantity in stock
private double price; // class variable stores the item price
...

And it doesn't work either. I think I am confusing myself more than I should be.
ITQUEST

put the main() including the {} inside the class not outside

[ITQUEST]

put the main() including the {} inside the class not outside

I worked on it and got it to run! Thanks so much for your help!
When I get to the next step of my assignment can I post any questions under this same thread or should I start a new one?

ITQUEST

[Ganon11]

You should probably start a new thread if you have any questions.