Questions about Inventory part 3

[Os Stewart]

Hello, I am starting on my Inventory part 3 Java and I am running into some problems here. Here is the assignment:

Modify the Inventory Program by creating a subclass of the product
class that uses one additional unique feature of the product you chose
(for the DVDs subclass, you could use movie title, for example). In the
subclass, create a method to calculate the value of the inventory of a
product with the same name as the method previously created for the
product class. The subclass method should also add a 5% restocking
fee to the value of the inventory of that product.
Modify the output to display this additional feature you have chosen and
the restocking fee.

I am having some difficulty. I modified one of the Inventory 2 programs I had this week into this, and I have a few questions.

1.) does this code represent what I am trying to do in my assignment, as stated above?
2.) Line 138 is an error "bad operand for (+)"
3.) Line 142 and 148 are warnings to "Add @override"

My code will not compile.
Also, I do not have very good Java lingo skills. I am not that good at Java and I'm trying to learn, but I just can't get it. I'm two weeks from graduating and I just want to get past this class. This is the only class I have had difficulty with.

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package ofelia_week_6_inventory_.program_part_3;

/**
 *
 * @author Ofelia G. S. Stewart
 */
public class Ofelia_Week_6_Inventory_Program_part_3 {

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]){

        DVD dvd;
         
        dvd = new DVD("Grumpy old men",1,1,17.00);
        System.out.println(dvd);

        dvd = new DVD("Grumpier Old Men",2,1,17.00);
        System.out.println(dvd);

        dvd = new DVD("Pretty Woman",3,1,19.95);
        System.out.println(dvd);

        dvd = new DVD("Goast",4,1,19.95);
        System.out.println(dvd);

        dvd = new DVD("Gone with the Wind",5,1,11.00);
        System.out.println(dvd);
    }//end main

    public Object getPrice;
    public Object getPrice() {
        return null;
    }
}//end class MovieInventory

class DVD{
    private String dvdTitle;
    private double dvdStock;
    private double dvdPrice;
    private double dvdItem;
    public Object reStockFee;

public DVD(String Title, double Stock, double Price, double Item){
    dvdTitle = Title;
    dvdStock = Stock;
    dvdPrice = Price;
    dvdItem = Item;
}//end constructor argument
//set DVD Item
public void setDVDItem(int item){
    dvdItem = item;
}//end method set DVD Item
//return DVD Item

public double getDVDItem(){
    return dvdItem;
}//end method get DVD Item

//set DVD Title
public void setDVDTitle(String Title){

    dvdTitle = Title;
}//end method set DVD Title

//return DVD Title

public String detDVDTitle(){
    return dvdTitle;
}//end method get DVD Title

public void setDVDStock(double Stock){
    dvdStock = Stock;
}//end method set DVD Stock

//return DVD Stock

public double getDVDStock(){

    return dvdStock;
}//end method get DVD Stock

public void setDVDPrice(double Price){
    dvdPrice = Price;
}//end method Set DVD Price

//return DVD price
public double getDVDPrice(){
    return dvdPrice;
}//end method get DVD Price

//calculate inventory value

public double value(){
    return dvdPrice * dvdStock;
}//end method value


public double calcValue(int Price, int Stock )
{
    return Stock*Price;
}

public String toString1()
{
    return "Product: " + dvdTitle + "\n" +
           "Product Item: " + dvdItem + "\n" +
           "Qty In Stock: " + dvdStock + "\n" +
           "Product Price: $"  + dvdPrice + "\n" +
           "Stock Value: $" + calcValue(0, 0);}

public class Dvd extends  Ofelia_Week_6_Inventory_Program_part_3{
    private final double price;
    public Dvd(double price) {
        this.price = price;
    }
        public double getprice(){
            return this.price;
    }
    public String toString1() {
        return new StringBuffer().append("Price:").append(getPrice()).toString();
    }  
    {
    class Dvd1 extends Ofelia_Week_6_Inventory_Program_part_3{
        private double reStockingFee;
        public Dvd1(double price, double reStockingFee){
            super();
        this.reStockingFee = reStockingFee;
        }
        public double getprice(){
            return super .getPrice()+ reStockingFee;
        }
         
        
    public String toString(){
        return new StringBuffer().append("Price:").append(super.getPrice()).append("With ReStocking Fee").append(getPrice()).toString();
    }  
    }
}
     
public String toString(){
    return String.format("%-20s %-20s %-20s %-20s", dvdTitle,dvdItem,dvdStock,dvdPrice, value());
    }
}
}//end class DVDb 

[Tony Docherty]

Locking this as it is a duplicate of https://coderanch.com/t/628181/java/java/Java-Beginner-Inventory-Program