// INSTANCE VARIABLE

public class Main {

public static void main(String[] args) {

Product prod1 = new Product();

prod1.Barcode = 123456;

Product prod2 = new Product();

prod2.Barcode = 987654;

System.out.println(prod1.Barcode);

System.out.println(prod2.Barcode);

}

}

public class Product {

public int Barcode;

}

Where are the mistakes?