java8对list进行多字段去重（亲测可用）

List<CatTest> catList = Lists.newArrayList();
catList.stream()
        .collect(
                Collectors.collectingAndThen(
                        Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(cat -> cat.getCarHobby() + cat.getCatName()))),
                        ArrayList::new
                )
        );