codes1.add(5457334);
ArrayList codes2 = new ArrayList();
codes2.add(4567);
codes2.add(3345);
Buy buy1 = new Buy("cat food", 16.5, codes1);
Buy buy2 = new Buy("citric juice", 7, codes2);
Buy buy3 = new Buy("space ship", 599.99, null);
ArrayList buys = new ArrayList();
buys.add(buy1);
buys.add(buy2);
buys.add(buy3);