集合分段 java stream流操作

    
//并行流
private static <T> List<List<T>> partition(final List<T> list, final int size) {
        int limit = (list.size() + size - 1) / size;
        return Stream.iterate(0, n -> n + 1).limit(limit).parallel()
                .map(a -> list.stream().skip(a * size).limit(size).parallel().collect(Collectors.toList()))
                .collect(Collectors.toList());
    }