Przekazywanie ArrayListy

package zad1;

import java.util.ArrayList;

public class Customer {

	private int cash;
	 String imie;
	 ArrayList<Flower> flowers = new ArrayList<Flower>();
	 ShoppingCart sc;
	 

	public Customer(String string, int i) {
		this.imie = string;
		this.cash = i;
	}

	public void pay() {
		double naleznosc = 0;
		for(Flower r : sc.getList()){
			if(r.cena!= -1.0){
			naleznosc = r.cena*r.ilosc;
			}else{
				sc.getList().remove(r);
			}
		}
		if(naleznosc>cash){
			
		}else{
			cash -= naleznosc;
		}
	}

	public void get(Flower rose) {
		flowers.add(rose);

	}

	public ShoppingCart getShoppingCart() {
		 sc = new ShoppingCart(flowers, imie);
		 this.flowers.clear();
		return sc;
	}

	public void pack(Box pudelkoJanka) {
		pudelkoJanka.kwiaty=sc.getList();	

	}

	public double getCash() {
		
		return cash;
	}
	

}

package zad1;

import java.util.ArrayList;

public class ShoppingCart {

	private ArrayList<Flower> flowers;
	String imie = "";

	public ShoppingCart(ArrayList<Flower> flowers2, String imie) {
		this.flowers = flowers2;
		this.imie = imie;
	}

	public String toString() {                                                     
		String str ="Wózek własciciel " + imie + "\n";
		for (Flower r : flowers) {
			str += r.typ + ", kolor: " + r.kolor + ", sztuk: " + r.ilosc + ", cena: " + r.cena + "\n";
			
		}
		return str;

	}
	
	public ArrayList<Flower> getList(){
		return flowers;
	}
}

public void pack(Box pudelkoJanka) {
		for(Flower r : sc.getList()){
			pudelkoJanka.kwiaty.add(r);
		}

	}

class Box {
 ...
 List<Flower> kwiaty = new ArrayList<Flower>();
...