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我有一个Products类列表，它具有以下属性：

public class Products{
private int month;
private int year;
private int sku;
private String detail;
private Double quantity;
private Double price;
private Double discount;
private Double %discount;

    // getters and setters

static List<Products> sumatoriaVentas(List<Products> itemList) {
    
List<Product> tempListP = new ArrayList<Product>();

    Collections.sort(itemList, Comparator.comparing(Product::getYear)
            .thenComparing(Product::getMonth).thenComparing(Product::getSku));
    
    
    Integer itemCode = null; 
    double quantiti = 0;
    double price = 0;
    double discount = 0;
    double %discount = 0;
    Products itemObj = null;
    Integer itemMonth= null;
    Integer itemYear= null;
    
        for (int i = 0; i < itemList.size(); i++) {
            if (itemCode == null || (itemCode.equals(itemList.get(i).getSku())  && itemMonth.equals(itemList.get(i).getMonth()) && itemMonth.equals(itemList.get(i).getYear())  )) {
                quantiti = quantiti + itemList.get(i).getquantiti();
                price = price + itemList.get(i).getprice();
                discount = discount + itemList.get(i).getdiscount();
                %discount = %discount + itemList.get(i).get%discount();
                itemMonth = itemList.get(i).getMonth();
                itemYea = itemList.get(i).getYear();
            } else {
                
                itemObj = new Product( itemList.get(i).getMonth(), itemList.get(i).getYear(), itemCode, "" , quantiti, price,discount,%discount);
                
                
                if (tempListP.contains(itemObj)) {
                    tempListP.remove(itemObj);
                }
                tempListP.add(itemObj);
                quantiti = 0;
                quantiti = quantiti + itemList.get(i).getquantiti();
                price = 0;
                price = price + itemList.get(i).getprice();
                discount = 0;
                discount = discount + itemList.get(i).getdiscount();
                %discount = 0;
                %discount = %discount + itemList.get(i).get%discount();
                itemMonth = itemList.get(i).getMonth();
                itemYea = itemList.get(i).getYear();
            }

            itemCode = itemList.get(i).getSku();

            if (i == itemList.size() - 1) {
                itemObj = new Product( itemList.get(i).getMonth(), itemList.get(i).getYear(), itemCode, "" , quantiti, price,discount,%discount);
                tempListP.add(itemObj);
            }
        
        
    }
    

    return itemList;
}


}

主要的

public static void main(String[] args) {

   List<Products> items = new ArrayList<Products>();

   items.add(new Products(8,2020,10203040,"Tshirt",1,10.00,1.00,0.1));
   items.add(new Products(9,2020,10203040,"Tshirt",2,20.00,2.00,0.2));
   items.add(new Products(3,2021,10203040,"Tshirt",3,30.00,3.00,0.3));
   items.add(new Products(7,2020,50607080,"Tshirt",4,40.00,4.00,0.4));
   items.add(new Products(8,2020,10203040,"Tshirt",5,50.00,5.00,0.5));
   items.add(new Products(8,2021,10203040,"Tshirt",8,80.00,8.00,0.8));

  Products.sumProduct(items);

物品清单

结果：

输入

月 | 年份 | 货号 | 详情 | 数量 | 价格 | 折扣 | ％ 折扣

8 | 2020 | 10203040 | T 恤 | 1 | 10 | 1 | 0.1

9 | 2020 | 10203040 | T 恤 | 2 | 20 | 2 | 0.2

3 | 2021 | 10203040 | T 恤 | 3 | 30 | 3 | 0.3

7 | 2020 | 50607080 | T 恤 | 4 | 40 | 4 | 0.4

8 | 2020 | 10203040 | T 恤 | 5 | 50 | 5 | 0.5

8 | 2021 | 10203040 | T 恤 | 8 | 80 | 8 | 0.8

最终结果应该是这样的：

输出：

月 | 年份 | 货号 | 详情 | 数量 | 价格 | 折扣 | ％ 折扣

7 | 2020 | 50607080 | T 恤 | 4 | 40 | 4 | 0.4

8 | 2020 | 10203040 | T 恤 | 6 | 60 | 6 | 0.6

9 | 2020 | 10203040 | T 恤 | 2 | 20 | 2 | 0.2

3 | 2021 | 10203040 | T 恤 | 3 | 30 | 3 | 0.3

8 | 2021 | 10203040 | T 恤 | 8 | 80 | 8 | 0.8

我想创建一个函数，该函数遍历产品列表并对具有相同月份、年份和 sku 的项目的值求和，并返回数量、价格、折扣、折扣百分比的总和列表。

但是我如何将上面的代码链接起来计算和求和呢？特别是对于超过 3 个字段（月、年和 sku）的分组。有一个更好的方法吗？

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