java 排序的問題

問題描述

[{TIME21=0, TIME22=2, TIME23=0, TIME12=0, TIME13=1, LOAN_AMT=500, TIME10=0, TIME20=0, TIME11=1, TIME17=0, TIME9=2, TIME16=0, TIME15=0, TIME14=1, TIME5=0, REG_DT=20170517, TIME6=0, TIME19=0, TIME7=0, TIME18=1, TIME8=4, TIME1=0, TIME2=0, TIME3=0, TIME4=0, TIME0=0}, {TIME21=3, TIME22=2, TIME23=3, TIME12=6, TIME13=7, LOAN_AMT=1000, TIME10=8, TIME20=2, TIME11=6, TIME17=6, TIME9=7, TIME16=2, TIME15=7, TIME14=5, TIME5=0, REG_DT=20170517, TIME6=1, TIME19=1, TIME7=3, TIME18=1, TIME8=5, TIME1=0, TIME2=1, TIME3=0, TIME4=0, TIME0=3}]

這是一個形式為List<Map<String,Object>> 格式的list，里面是map，我想經過排序后讓其按照TIME0，TIME1，TIME2.....TIME23的形式排序，該怎么排序呢？而且類似 TIME1 這種的類型是BigDecimal。里面的LOAN_AMT和REG_DT不用管，我只是用循環得到TIMExx這些信息

問題解答

其實，你只需要把List<Map<String,Object>>改成List<TreeMap<String,Object>>就可以了.....TreeMap是按照Kay進行排序的。

TreeMap<String,Object> map = new TreeMap<>();map.put('TIME0','TIME0');map.put('TIME22','TIME22');map.put('TIME15','TIME15');map.put('TIME11','TIME11');map.put('TIME19','TIME19');map.put('TIME1','TIME1');System.out.println(map); // {TIME0=TIME0, TIME1=TIME1, TIME11=TIME11, TIME15=TIME15, TIME19=TIME19, TIME22=TIME22}