Write a program to using marker interface create a class product(product_id, product_name, product_cost, product_quantity) define a default and parameterized constructor. Create objects of class product and display the contents of each object and Also display the object count.

Write a program to using marker interface create a class product(product_id,product_name, product_cost, product_quantity) define a default and parameterized constructor. Create objects of class product and display the contents of each object and Also display the object count.

import java.util.*;
interface ProductMarker
{
}
class Product implements ProductMarker
{
int id;
String name;
int cost;
int quantity;
int count;
Product(){
id=0;
name=" ";
cost=0;
quantity=0;
}
Product(int id, String name, int cost, int quantity){
this.id=id;
this.name=name;
this.cost=cost;
this.quantity=quantity;
this.count++;
}
}
public class Products
{
public static void main(String[] args)
{
int count=0;
Scanner a = new Scanner(System.in);
System.out.println("How many product ?");
int number = a.nextInt();

System.out.println("\n");
Product products[] = new Product[number];
System.out.println("Enter Product data");
for(int k=0; k<number; k++)
{
System.out.println("Product Id ");
int id =a.nextInt();
System.out.println("Product name ");
String name = a.next();
System.out.println("Product cost ");
int cost = a.nextInt();
System.out.println("Product qantity ");
int quantity = a.nextInt();
System.out.println("\n");
products[k] = new Product(id, name, cost, quantity);
count++;
}
//Testing for marker interface
if(products[0] instanceof ProductMarker){
System.out.println("Class is using ProductMarker");
}
System.out.println(" Product details\n");
for(Product product:products)
{
System.out.println("Product Id " + product.id);
System.out.println("Product name " + product.name);
System.out.println("Product cost " + product.cost);
System.out.println("Product qantity " + product.quantity);
System.out.println("\n");
}
System.out.println("Total object is "+count);
}
}

Output:

How many product ?
2

Enter Product data
Product Id
1
Product name
XtraPen
Product cost
5
Product qantity
5

Product Id
2
Product name
XtraPencil
Product cost
2
Product qantity
4

Class is using ProductMarker
Product details
Product Id 1
Product name XtraPen
Product cost 5
Product qantity 5

Product Id 2
Product name XtraPencil
Product cost 2
Product qantity 4

Total object is 2