int officialShopId = shopId;
group.setShopId(officialShopId);
XmpUser xmpSeller = buildXmpUser(seller.getSellerInfo());
group.setSeller(xmpSeller);
List<XmpItem> xmpItems = buildXmpItemList(sellerList,clientName, officialShopId);
group.setItems(xmpItems);

以上程式碼看上去比較雜亂無章，可以做一個簡單分組。

int
 
 officialShopId = shopId;
XmpUser xmpSeller = buildXmpUser(seller.getSellerInfo());
List<XmpItem> xmpItems = buildXmpItemList(sellerList,clientName, officialShopId);
                    
group.setShopId(officialShopId);  
group.setSeller(xmpSeller);
group.setItems(xmpItems);

這樣就清晰很多，一方面可讀性變好了，另一方面會便於進一步的重構，比如抽取小方法。

關於物件設定，C#的語法明顯比java簡潔多了。

group = new Group() { ShopId = officialShopId, 
                      Seller = xmpSeller,
                      Items = xmpItems
                    };

java下面可能用fluent API是種選擇。

group.setShopId(officialShopId)
     .setSeller(xmpSeller)
     .setItems(xmpItems);