java8 stream distinct by key

2023年2月19日 428次阅读来源: hackcoder

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;
}

deviceRecords.stream().filter(distinctByKey(deviceRecord -> deviceRecord.getDeviceMac())).forEach(deviceRecord -> {
    System.out.println(deviceRecord.getDeviceMac());
});

    原文作者：hackcoder
    原文地址: https://blog.csdn.net/hackcoder/article/details/54863777
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