java集合通过对象属性进行去重

java集合通过对象属性进行去重

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:
（根据实体类的name属性进行去重）

list.stream().filter(distinctByKey(Entity::getName)).collect(Collectors.toList())