●●●●● ●●●● 根据交互图中创建方法 ●●● ●●● ●●●● enterltem(id, qty) 2: makeLineltem(desc, gty) Register Sale 1: desc= getProductDesc(id) 2.1: create(desc, qty) Catalog sI: SalesLineltem 1.1: desc= get(id 2.2: add(sl) Map<ProductDescription> lineltems ist<salesLineltem> public void enterltem(ItemID itemID, int qty);根据交互图中创建方法 2: makeLineItem(desc, qty) enterItem(id, qty) 1: desc = getProductDesc(id) 2.1: create(desc, qty) 1.1: desc = get(id) :Register :Sale :Product Catalog sl: SalesLineItem lineItems : List<SalesLineItem> : Map<ProductDescription> 2.2: add(sl) public void enterItem(ItemID itemID, int qty);