Java数据去重实用方法

实测数据去重好方法

去重方法1
public class DataDealWithUtil {
public static Predicate distinctByKey(Function<? super T, ?> keyExtractor) {
Map<Object, Boolean> seen = new ConcurrentHashMap<>();
return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
}
}

resultList = resultList.stream().filter(DataDealWithUtil.distinctByKey(o -> o.getDistinct())).collect(Collectors.toList());

去重方法2
resultList = resultList .stream().collect(Collectors.collectingAndThen(Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(BusinessMsgBean :: getId))), ArrayList::new));

去重方法有很多，但这种方法我一直用，感觉很好用，分享一下。