public class Product  {

    // our attributes: name, price, code, number, category

    private String name;
    private double price;
    private int code;
    private int number;
    private String category;

    // constructor (takes as arguments: name, price, code, category)
    // and initializes number to 0 (we mean to have initially no item in store)

    public Product(String n, double p, int c, String cat) {
        name = n;
        price = p;
        code = c;
        category = cat;
        number = 0;
    }

    // 5 get methods

    public String getName() {
        return name;
    }
    public double getPrice() {
        return price;
    }
    public int getCode() {
        return code;
    }
    public int getNumber() {
        return number;
    }
    public String getCategory() {
        return category;
    }

    // buy method (takes as argument the number of items the shop buys)
    // buy has no return value

    public void buy(int k) {
        number += k;
    }

    // sell method (takes as argument the number of items the shop sells = n)
    // it decreases number by n, if number >= n
    // or it sets number to 0, if number < n
    // the return value should be the number of items actually sold

    public int sell(int n) {

       // i have *number* items
       // the user wants to get *n*

       if (number >= n) {
             // ok, have enough -> I'm going to give away n
             number -= n;
             return n;
       } else {
             // oops, i'm going to give away number
             number = 0;
             return number;
       }

    }
    // sell() ends here!

}