Write in Java code.define instance variables for the class, a constructor to initialize those variables, one or more mutators to modify the variables, one or more accesssors ## Problem Statement### Defining ClassesWrite and document the definition for the `Product` class. The `Product` class represents an item that would appear for sale on a website or in a department store (like a toaster).#### Diagram ExplanationThe diagram depicts the `Product` class, which includes the following:- **Fields:** - `description : String` - `price : double` - `productNumber : int`- **Methods:** - `getCost(int qty) : double` - `Product(int pNum, String pDesc, double price)` - `setDescription(String newDesc) : void` - `setPrice(double newPrice) : void` - `toString() : String`### Additional Details- Each `Product` object has three instance variables: `description`, `productNumber`, and `price`.- The class has one constructor that takes three parameters in the order `productNumber`, `description`, and `price`.- The class has one accessor method named `getCost(int qty)` which returns the `price` for `qty` items of the `Product`.- The class has two mutator methods—`setPrice()` and `setDescription()`—that modify the corresponding instance variables.- The class has a `toString()` method that returns the `Product` as a `String` in the form: `34567: Small Toaster, $ 17.95`. **Note:** Use concatenation to construct the returned string. Do not use the `String.format()` method to format the returned value.

public class Product { int productNumber; String description; double price; public Product(int pNum, String pDesc, double price) { this.productNumber = pNum; this.description = pDesc; this.price = price; } public double getCost(int qty) { return (this.price * qty); } public void setPrice(double newPrice) { this.price = newPrice; } public void setDescription(String newDesc) { this.description = newDesc; } public String toString() { return productNumber + ": " + description + ", $ " + price; }}class Test101 { public static void main(String args[]) { Product p1 = new Product(34567, "Small Toaster", 17.95); System.out.println(p1); Product p2 = new Product(12345, "", 0); System.out.println(p2); p2.setDescription("Bread"); p2.setPrice(1); System.out.println(p2); System.out.println(p2.getCost(5)); }}