자료형 ArrayList Map String,Object

결과값

[0] "date" = "2019-08-01 00:00:00" , "work" : "워크" , "department" : "부서" , "username" : "감자"> [1] "date" = "2019-08-01 00:00:00" , "work" : "워크" , "department" : "부서" , "username" : "고구마"> [2] "date" = "2019-08-01 00:00:00" , "work" : "워크" , "department" : "부서" , "username" : "무우"> [3] "date" = "2019-08-02 00:00:00" , "work" : "워크" , "department" : "부서" , "username" : "감자">

아래와같은 형식으로 나오도록 가공하고 싶은데 어떤 방법이 좋을까요? ㅠㅠ

{ username :"감자", department : "부서", schedule :[ { date : 2019-08-01 00:00:00, work : 워크 } , {date : 2019-08-02 00:00:00, work : 워크} ] }