使用Java8特性对list进行按属性去重

编写工具类

public class DistinctUtil {
    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;
    }
}

使用方式如下（意思是：根据releaseVersions是一个List<MDynamicFuncReleaseVersion>，然后根据MDynamicFuncReleaseVersion的ReleaseVersion属性对List进行数据去重）：

releaseVersions.stream().filter(DistinctUtil.distinctByKey(MDynamicFuncReleaseVersion::getReleaseVersion)).collect(Collectors.toList());