List<Map<String, Object>>
[
{
"todaysharecount": 0,
"activetime": "2018-12-03",
"todayjoincount": 0,
"todayactivecount": 1
},
{
"sharetime": "2018-12-05",
"todayjoincount": 0,
"todaysharecount": 2,
"todayactivecount": 9,
"activetime": "2018-12-05"
},
{
"todayjoincount": 0,
"todaysharecount": 2,
"sharetime": "2018-11-29",
"todayactivecount": 0
},
{
"todayjoincount": 0,
"todaysharecount": 2,
"sharetime": "2018-12-01",
"todayactivecount": 0
},
{
"todayjoincount": 0,
"todaysharecount": 2,
"sharetime": "2018-12-02",
"todayactivecount": 0
},
{
"todaysharecount": 0,
"todayjoincount": 4,
"jointime": "2018-11-23",
"todayactivecount": 0
},
{
"todaysharecount": 0,
"todayjoincount": 1,
"jointime": "2018-11-27",
"todayactivecount": 0
},
{
"todaysharecount": 0,
"jointime": "2018-11-30",
"todayjoincount": 4,
"todayactivecount": 0
},
{
"todaysharecount": 0,
"todayjoincount": 2,
"jointime": "2018-12-03",
"todayactivecount": 0
}
]
这样一个LIST 怎么做到合并日期 每个Map里值大概都是这样 按照日期排序
{
"time": "2018-12-03",
"todaysharecount": 0,
"todayjoincount": 2,
"todayactivecount": 0
}
简单来说：构造一个以时间yyyy-MM-dd为key，包含
"time": "2018-12-03",
"todaysharecount": 0,
"todayjoincount": 2,
"todayactivecount": 0
值内容的ConcurrentHashMap，遍历复合List，来操作Map，具体的操作不是太难就不详细展开了！
具体你要做什么不是很清楚，为什么合并以后的日期是12-03了。
建议你先看下这个：https://blog.csdn.net/beirdu/article/details/78585945