Java assignment

list add,3,loaf of bread add,2,jug of milk list buy,2,loaf of bread add,4,loaf of bread buy,3,jug of milk buy,1,stick of butter list buy,5,loaf of bread buy,2,banana list add,1,apple add,2,banana add,3,cauliflower add,4,durian buy,5,kumquat add,5,kumquat buy,4,kumquat buy,1,kumquat list