Collectors.partitioningBy

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功能说明：将一个list按照条件拆分为两个子list

功能代码实例

public static void main(String[] args) {
        Artist artist = new Artist();

        artist.setMembers(Arrays.asList("1", "2"));

        ArrayList<Artist> artists = new ArrayList<>();

        artists.add(artist);

        Map<Boolean, List<Artist>> booleanListMap = bandsAndSolo(artists.stream());

        System.out.println(booleanListMap.get(true));

        System.out.println(booleanListMap.get(false));
}

/*
     * 分流
     */
    public static Map<Boolean, List<Artist>> bandsAndSolo(Stream<Artist> artists) {
        return artists.collect(Collectors.partitioningBy(artist -> artist.getMembers().size() > 1));
    }

返回结果
[Artist(name=null, members=[1, 2], origin=null)]
[]