Java "Inventory program" help

[hamiltongreg]

I am new to Java and am having problems getting my program to compile correctly.

My assignment is as follows;
Choose a product that lends itself to an inventory (for example, products at your workplace, office supplies, music CDs, DVD movies, or software).
• Create a product class that holds the item number, the name of the product, the number of units in stock, and the price of each unit.
• Create a Java application that displays the product number, the name of the product, the number of units in stock, the price of each unit, and the value of the inventory (the number of units in stock multiplied by the price of each unit). Pay attention to the good programming practices in the text to ensure your source code is readable and well documented.

Here is what I have so far

 
/** 
  *@author Greg Hamilton
  *Program was changed 31 Aug 07
  *The purpose of this program is to create a product class that holds an item number, name of the DVD movie, number of units in stock
  *and the price of each unit
*/
 
   import java.util.Scanner;
   import java.io.*;
   import java.util.*;
 
 
   public class Dvd extends Object
 
    {
 
     private String dvdTittle;
     private double dvdStock;
     private double dvdPrice;
     private double dvdItem;
 
     public Dvd( String tittle, double stock, double price, double item )
 
     {
       //implicit call to Object constructor occurs here
       dvdTittle = tittle;
       dvdStock = stock;
       dvdPrice = price;
       dvdItem = item;
      } //end four-argument constructor
 
 
 
      //set DVD name
      public void setdvdTittle( String tittle )
      {
          dvdTittle = tittle;
      } //end method setDvdTittle
 
      //return dvd Tittle
      public String getDvdTittle()
      {
        return dvdTittle;
      } //end method getDvdTittle
 
      //set Dvd stock
      public void setDvdStock( double stock)
      {
       dvdStock = ( stock < 0.0 ) ? 0.0 : stock;
      } //end method setDvdStock
 
      //return dvd stock
      public double getDvdStock()
      {
        return dvdStock;
      } //end method getDvdStock
 
     public void setDvdPrice( double price )
     {
        dvdPrice = ( price <0.0 ) ? 0.0 : price;
     } //end method SetDvdPrice
 
     //return dvd price
     public double getDvdPrice()
     {
       return dvdPrice;
     } //end method get Dvd Price
 
     public void setDvdItem( double item )
     {
       dvdItem = ( item <0.0) ? 0.0 : item;
     } //end method set dvd Item
 
     //return dvd item
 
     public double getDvdItem()
     {
       return dvdItem;
     } //end method getDvdItem
 
 
    // calculate inventory value
    public double value()
    {
       return dvdPrice * dvdStock;
 
    } //end method value
 
    //instantiate Collection object
        Dvd aDvd= new Dvd ("Dejavu", "10", "12.50", "101");  
 
 
 
     public static void main( String args[] )
 
       {
 
 
 
 
      System.out.printf("%s %s\n", "Product Tittle is",
         Dvd.gettittle() );
      System.out.printf("%s %s\n", "The number of units in stock is", 
         Dvd.getstock() );
      System.out.printf("%s %s\n", "The price of each DVD is",
         Dvd.getprice() );
      System.out.printf("%s %s\n", "The item number is",
         dvd.getitem() );
      System.out.printf("%s %s\n", "The value of the inventory is",
         Dvd.getvalue() );
 
      } //end main
 
   } //end class Dvd
 
 

My complier does not like my Dvd aDVD = new Dvd(); statement. I filled in values to populate the data points required for the program.

The error codes that I get are as follows;

6 errors found:
File: C:\Documents and Settings\Greg\D esktop\Dvd.java [line: 90]
Error: C:\Documents and Settings\Greg\D esktop\Dvd.java :90: cannot find symbol
symbol : constructor Dvd(java.lang.S tring,java.lang .String,java.la ng.String,java. lang.String)
location: class Dvd
File: C:\Documents and Settings\Greg\D esktop\Dvd.java [line: 102]
Error: C:\Documents and Settings\Greg\D esktop\Dvd.java :102: cannot find symbol
symbol : method gettittle()
location: class Dvd
File: C:\Documents and Settings\Greg\D esktop\Dvd.java [line: 104]
Error: C:\Documents and Settings\Greg\D esktop\Dvd.java :104: cannot find symbol
symbol : method getstock()
location: class Dvd
File: C:\Documents and Settings\Greg\D esktop\Dvd.java [line: 106]
Error: C:\Documents and Settings\Greg\D esktop\Dvd.java :106: cannot find symbol
symbol : method getprice()
location: class Dvd
File: C:\Documents and Settings\Greg\D esktop\Dvd.java [line: 108]
Error: C:\Documents and Settings\Greg\D esktop\Dvd.java :108: cannot find symbol
symbol : variable dvd
location: class Dvd
File: C:\Documents and Settings\Greg\D esktop\Dvd.java [line: 110]
Error: C:\Documents and Settings\Greg\D esktop\Dvd.java :110: cannot find symbol
symbol : method getvalue()
location: class Dvd


Thanks for any help that you can give me.

[shaileshkumar]

include the following piece of code in your code.
public Dvd()
{


}

The reason for this is compiler does not supply default constructor when there are parameterised constructors.
Also
you need not extend your class with Object class.
It happens by default.



with regards,
shailesh

[hamiltongreg]

Thanks for the pointers. I removed the extension for the object class.

I don't mean to sound dense here, but when I added the public Dvd() and the braces in my code (at the end, before the print statments), I got a illegal start of expression error.

Is there a specific place that I should have added the public DVD() in?

Thanks again.

include the following piece of code in your code.
public Dvd()
{


}

The reason for this is compiler does not supply default constructor when there are parameterised constructors.
Also
you need not extend your class with Object class.
It happens by default.



with regards,
shailesh

[JosAH]

Thanks for the pointers. I removed the extension for the object class.

I don't mean to sound dense here, but when I added the public Dvd() and the braces in my code (at the end, before the print statments), I got a illegal start of expression error.

Is there a specific place that I should have added the public DVD() in?

Thanks again.

You don't need to add a no-args constructor Dvd(); the error at line 90 is raised
because you don't have a Dvd constructor that takes four Strings. Read that
error message carefully and you'll see that this is exactly what the compiler
is trying to tell you.

You do have a Dvd constructor that takes one string and three doubles. That
should ring a bell.

The new errors you got is because of mismatched curly brackets.

kind regards,

Jos

[shaileshkumar]

in hurry i gave you some irrelevant answer.

Correct solution for your problem is:

you have declared public Dvd(String,Floa t ,.........)
but you have supplied all the strings as parameters in your code.


remove double quotes for all parameters except the first one.

[shaileshkumar]

Dvd aDvd= new Dvd ("Dejavu", 10, 12.50, 101);


apart from these ,check spelling mistakes.

[shaileshkumar]

few more corrections:


call the methods like this
aDvd.getDvDTitl e();
aDvd.getDVDStoc k();

[shaileshkumar]

//dear hamilton: you wont get any error now
//completely corrected & excecuted code

public class Dvd extends Object

{

private String dvdTittle;
private double dvdStock;
private double dvdPrice;
private double dvdItem;
public Dvd( String tittle, double stock, double price, double item )

{
//implicit call to Object constructor occurs here
dvdTittle = tittle;
dvdStock = stock;
dvdPrice = price;
dvdItem = item;
} //end four-argument constructor



//set DVD name
public void setdvdTittle( String tittle )
{
dvdTittle = tittle;
} //end method setDvdTittle

//return dvd Tittle
public String getDvdTittle()
{
return dvdTittle;
} //end method getDvdTittle

//set Dvd stock
public void setDvdStock( double stock)
{
dvdStock = ( stock < 0.0 ) ? 0.0 : stock;
} //end method setDvdStock

//return dvd stock
public double getDvdStock()
{
return dvdStock;
} //end method getDvdStock

public void setDvdPrice( double price )
{
dvdPrice = ( price <0.0 ) ? 0.0 : price;
} //end method SetDvdPrice

//return dvd price
public double getDvdPrice()
{
return dvdPrice;
} //end method get Dvd Price

public void setDvdItem( double item )
{
dvdItem = ( item <0.0) ? 0.0 : item;
} //end method set dvd Item

//return dvd item

public double getDvdItem()
{
return dvdItem;
} //end method getDvdItem


// calculate inventory value
public double value()
{
return dvdPrice * dvdStock;

} //end method value

//instantiate Collection object




public static void main( String args[] )

{

Dvd aDvd= new Dvd ("Dejavu", 10, 12.50, 101);


System.out.prin tln("Product Tittle is"+ aDvd.getDvdTitt le() );
System.out.prin tln("The number of units in stock is"+
aDvd.getDvdStoc k() );
System.out.prin tln("The price of each DVD is"+ aDvd.getDvdPric e() );
System.out.prin tln( "The item number is"+ aDvd.getDvdItem ());
System.out.prin tln( "The value of the inventory is"+ aDvd.value() );

} //end main

} //end class Dvd

[hamiltongreg]

Thank you so much for the help! Everything works now.

[JosAH]

//dear hamilton: you wont get any error now
//completely corrected & excecuted code

You know, this forum's policy is *not* to spoonfeed code; don't do this again.
If you had read the forum guidelines (see the 'Help' link in the top-right corner
of this page, you could have known this).

It's too late now, the OP has been spoonfed; don't do this again. I won't make
this an official warning, but please cooperate with this forum's guidelines.

kind regards,

Jos