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List<String> strs = Arrays.asList("aaa", "bbb", "ccc", "ddd"); String listToStr= strs.stream().collect(Collectors.joining(",")); 参考: https://blog.csdn 阅读全文
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一、String list中是否有重复元素 public static void main(String[] args) { List<String> stringList=new ArrayList<>(Arrays.asList("a","a","b","c")); long count = s 阅读全文
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sql中的having表示对查询结果之后的过滤,下面的例子是对group by之后的结果进行过滤 SELECT DISTINCT(dz_code) from zb_tech_info_collect_unitwhereszjd = '20212'and ssfd_id in (select dept 阅读全文
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用处,意义,价值,意思,,,是同义词 阅读全文