java8 利用 ConcurrentHashMap list根据某个属性去重

2024-10-20 08:01:10

//自定义方法
private static <T> Predicate<T> distinctByKey(Function<? super T, Object> keyExtractor) {
    Map<Object, Boolean> seen = new ConcurrentHashMap<>();
    return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
}
//使用

List<BindedNote> knowledgeList = page.getResult().stream().filter(distinctByKey(BindedNote::getNoteId)).collect(Collectors.toList());

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