我从数据库收到以下列表，我想将其转换为 JSON：
Employee e1=new Employee(101,"Ha","De","Acr");
Employee e2=new Employee(102,"D ","Forouzan","Mc");
Employee e3=new Employee(102,"Op","Ga","Wi");
Employee e4=new Employee(101,"YUI","HI","EX");
我想改变它只是它遍历上面收到的列表，对于重复的键 (101, 102)，它使用数组创建一个 jsoobject；
ex: 101 : {["Ha","De","Acr"],["YUI","HI","EX"]}