Задача реализовать интерфейс и его наследников

/*FastFood.java*/
 
import java.util.Date;
 
interface FastFood {
    void cook();
    void printInfo();
    boolean isFresh();
}

/*Sandwich.java*/
 
class Sandwich implements FastFood {
    private String ingredients;
    private Date expiryDate;
 
    public Sandwich(String ingredients, Date expiryDate) {
        this.ingredients = ingredients;
        this.expiryDate = expiryDate;
    }
 
    @Override
    public void cook() {
        System.out.println("Cooking sandwich with ingredients: " + ingredients);
    }
 
    @Override
    public void printInfo() {
        System.out.println("Sandwich ingredients: " + ingredients);
        System.out.println("Expiry date: " + expiryDate);
    }
 
    @Override
    public boolean isFresh() {
        Date currentDate = new Date();
        return currentDate.before(expiryDate);
    }
}

/*Hamburger.java*/
class Hamburger implements FastFood {
    private String ingredients;
    private Date expiryDate;
 
    public Hamburger(String ingredients, Date expiryDate) {
        this.ingredients = ingredients;
        this.expiryDate = expiryDate;
    }
 
    @Override
    public void cook() {
        System.out.println("Cooking hamburger with ingredients: " + ingredients);
    }
 
    @Override
    public void printInfo() {
        System.out.println("Hamburger ingredients: " + ingredients);
        System.out.println("Expiry date: " + expiryDate);
    }
 
    @Override
    public boolean isFresh() {
        Date currentDate = new Date();
        return currentDate.before(expiryDate);
    }
}

/*Main.java*/
public class Main {
    public static void main(String[] args) {
        Sandwich sandwich = new Sandwich("Bread, ham, cheese, lettuce, tomato", new Date(1234567890));
        Hamburger hamburger = new Hamburger("Bread, beef patty, cheese, pickles, ketchup", new Date(9876543210));
 
        sandwich.cook();
        sandwich.printInfo();
        System.out.println("Is sandwich fresh? " + sandwich.isFresh());
 
        hamburger.cook();
        hamburger.printInfo();
        System.out.println("Is hamburger fresh? " + hamburger.isFresh());
    }
}