public static LinkedHashMap<String, List<AirQualityRankingResp>> mapSortedByKey(Map<String, List<AirQualityRankingResp>> param) {
// 分组后根据key正序排列,()LinkedHashMap有序)
LinkedHashMap<String, List<AirQualityRankingResp>> collect = param.entrySet().stream().sorted(new Comparator<Map.Entry<String, List<AirQualityRankingResp>>>() {
@Override
public int compare(Map.Entry<String, List<AirQualityRankingResp>> o1, Map.Entry<String, List<AirQualityRankingResp>> o2) {
try {
Date d1 = new SimpleDateFormat("yyyy-MM").parse(o1.getKey());
Date d2 = new SimpleDateFormat("yyyy-MM").parse(o2.getKey());
return d1.compareTo(d2);
} catch (Exception e) {
e.printStackTrace();
}
return 0;
}
}).collect(Collectors.toMap(
Map.Entry::getKey,
Map.Entry::getValue,
(oldVal, newVal) -> oldVal,
LinkedHashMap::new
));
return collect;
}
对HashMap的key进行排序
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转载自blog.csdn.net/qq_45752401/article/details/125104940
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