如何在java上对重复数据的数组值求和答案

【问题标题】：How to sum array value of duplicate data on java如何在java上对重复数据的数组值求和
【发布时间】：2019-02-26 17:07:55
【问题描述】：

我有来自 arraylist 的 JSON 数据

原样：

[{"CategoryID":"2","Discontinued":"0","ProductID":"3","ProductName":"Aniseed Syrup","QuantityPerUnit":"12 - 550 ml bottles","ReorderLevel":"25","SupplierID":"1","UnitPrice":"10000","UnitsInStock":"13","UnitsOnOrder":"70"},{"CategoryID":"2","Discontinued":"1","ProductID":"5","ProductName":"Chef Anton\u0027s Gumbo Mix","QuantityPerUnit":"36 boxes","ReorderLevel":"0","SupplierID":"2","UnitPrice":"21350","UnitsInStock":"0","UnitsOnOrder":"0"},{"CategoryID":"2","Discontinued":"0","ProductID":"3","ProductName":"Aniseed Syrup","QuantityPerUnit":"12 - 550 ml bottles","ReorderLevel":"25","SupplierID":"1","UnitPrice":"10000","UnitsInStock":"13","UnitsOnOrder":"70"}]

如何在java android 中通过arraylist 的产品id & sum unitprice & quantity 合并JSON数据？

未来：

[{"CategoryID":"2","Discontinued":"0","ProductID":"3","ProductName":"Aniseed Syrup","QuantityPerUnit":"2","ReorderLevel":"25","SupplierID":"1","UnitPrice":"20000","UnitsInStock":"13","UnitsOnOrder":"70"},{"CategoryID":"2","Discontinued":"1","ProductID":"5","ProductName":"Chef Anton\u0027s Gumbo Mix","QuantityPerUnit":"36 boxes","ReorderLevel":"0","SupplierID":"2","UnitPrice":"21350","UnitsInStock":"0","UnitsOnOrder":"0"}]

【问题讨论】：

你有没有尝试过？你的方法是什么？进展如何？

标签： java android arraylist

【解决方案1】：

您可以通过编写自己的映射函数或使用 json 解析器库将值映射到对象。然后，您可以使用您的对象类型将所有对象添加到 Set<T>。

【讨论】：