java stream List排序，List去重

ListMap排序(stream)

list.stream().sorted(Comparator.comparing(map -> Integer.parseInt(map.get("monthtime").toString()))).collect(Collectors.toList());

List<Map<String, Object>> lista = list.stream().sorted(Comparator.comparing(map -> Integer.parseInt(map.get("aa").toString()))).collect(Collectors.toList());

List<Map<String, Object>> sScore = lstMap.stream().sorted(
	Comparator.comparing(
		m -> {
				BigDecimal sScore1 = Convert.toBigDecimal(m.get("sScore").toString());
				return sScore1;
		})
).collect(Collectors.toList());

Collections.reverse(sScore);

List去重

   List<String> lstResult = new ArrayList<>();
   List<String> lstHouseId = new ArrayList<>();
   
   lstResult = lstHouseId.stream().distinct().collect(Collectors.toList());   

Collectors.toMap()
https://blog.csdn.net/qq_33204709/article/details/128058684

转字符串

List<Long> lstCompanyIds = Arrays.asList(1L, 2L, 3L, 4L, 5L);
String result = lstCompanyIds.stream().map(Object::toString).collect(Collectors.joining(","));
		lstCompanyIds.stream().map(String::valueOf).collect(Collectors.joining(","));