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  • list一个字段去重

      //按照某个字段去重
        public static <T> Predicate<T> distinctByKey(Function<? super T, ?> keyExtractor) {
            Map<Object, Boolean> seen = new ConcurrentHashMap<>();
            return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
        }
     List<IntegralCountVo> lists = list.stream().filter(distinctByKey(b -> b.getCompanyId())).collect(Collectors.toList());
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  • 原文地址:https://www.cnblogs.com/huqi96/p/13977414.html
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