Реализация клонирования в Java

public class Main {
    public static void main(String[] args){
 
        FoodItem Snickers2 = new FoodItem();
        FoodItem Snickers3 = foo(Snickers2);
        Snickers2.ID=6;
        Snickers2.name = "Snickers1";
        Snickers2.price = 2;
        Snickers2.category = FoodItem.Category.FOOD;
        Snickers2.expires = 10;
        Snickers1.dateOfIncome = new GregorianCalendar(2014, 2, 22, 12, 15, 25);
 
        Snickers3.printAll();
 
        
 
 
    public static FoodItem foo(FoodItem Snickers2) {
 
        FoodItem Snickers = null;
 
        try {
            Snickers = Snickers2.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
 
        return Snickers;
    }

public class FoodItem extends GenericItem implements Cloneable {
    public short expires;
    public GregorianCalendar dateOfIncome;
 
 
    void printAll() {
        System.out.printf("ID: %d , Name: %-20s , price:%5.2f, Category: %-20s, Expires: %d , Date: %tD%n  ", ID, name, price, category, expires, dateOfIncome );
    }
 
 
    @Override
    public FoodItem clone() throws  CloneNotSupportedException{
        return (FoodItem) super.clone();
    }
 
 
}

import java.util.GregorianCalendar;
 
public class Task035 {
    public static void main(String[] args) {
 
        FoodItem fooFirst = new FoodItem();
        FoodItem fooSecond = fooFirst.clone();
        System.out.println(fooFirst);
        System.out.println(fooSecond);
    }
}
 
class FoodItem implements Cloneable {
    public short expires;
    public GregorianCalendar dateOfIncome;
 
 
    void printAll() {
        System.out.printf("Expires: %d , Date: %tD%n  ", expires, dateOfIncome);
    }
 
 
    @Override
    public FoodItem clone() {
        FoodItem clone = null;
        try {
            clone = (FoodItem) super.clone();
            if (this.dateOfIncome != null) {
                clone.dateOfIncome = (GregorianCalendar) this.dateOfIncome.clone();
            }
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return clone;
    }
 
 
}