collections 自定义排序

class ComparatorShop implements Comparator{
public int compare(Object arg0, Object arg1) {
 Shop shop0=(Shop)arg0;
 Shop shop1=(Shop)arg1;
 //按shopCode排序
 int flag=shop0.getShopCode().compareTo(shop1.getShopCode());
 return flag; 
}
}

List<Shop> shops = shopService.getShopList(preMall.getId());
ComparatorShop comparator=new ComparatorShop();
Collections.sort(shops, comparator);