gistfile1.txt

package menu;

public class MenuRunner {
    public static void main(String[] args) {
        Menu menu1 = new Menu("First");
        Menu menu2 = new Menu("Second");

        Dish borch = new Dish("Borch", "Hot", 35);
        Dish sup = new Dish("Sup", "Hot", 30);
        Dish kharcho = new Dish("Kharcho", "Hot", 25);

        Dish potato = new Dish("Potato", "Hot", 20);
        Dish meat = new Dish("Meat", "Hot", 45);
        Dish cake = new Dish("Cake", "Cold", 35);

        menu1.addDish(borch);
        menu1.addDish(sup);
        menu1.addDish(kharcho);

        menu2.addDish(potato);
        menu2.addDish(meat);
        menu2.addDish(cake);

        System.out.println("The cheapest dish is: " + menu1.getCheapestDish());
        System.out.println("The cheapest dish is: " + menu2.getCheapestDish());
    }
}

gistfile2.txt

package menu;

public class Dish {
    private final String name;
    private final String description;
    private final long price;

    @Override
    public String toString() {
        return "Dish{" +
                "price=" + price +
                '}';
    }

    public String getDescription() {
        return description;
    }

    public long getPrice() {
        return price;
    }

    public String getName() {

        return name;
    }

    public Dish(String name, String description, long price) {
        this.name = name;
        this.description = description;
        this.price = price;

    }

}

Menu

package menu;

import java.util.ArrayList;

public class Menu {
    private final String name;
    private final ArrayList<Dish> dishes = new ArrayList<>();

    public Menu(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    @Override
    public String toString() {
        return "Menu{" +
                "name='" + name + '\'' +
                ", dishes=" + dishes +
                '}';
    }

    public Dish getCheapestDish() {
        long dishPrice = dishes.get(0).getPrice();
        Dish cheapestDish = null;
        for (Dish d : dishes) {
            if (d.getPrice() <= dishPrice){
                cheapestDish = d;
            }
        }
        return cheapestDish;
    }

    public void addDish(Dish dish) {
        dishes.add(dish);
    }
}