Java "Inventory program" help

/** 
  *@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