Java8中List的排序

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1、基本类型的List集合的排序

    public void testListSort() {        List<Long> idList = new ArrayList<>();        idList.add(23L);        idList.add(22L);        idList.add(20L);        idList.add(21L);        System.out.println(idList);        //java8 before        idList.sort(new Comparator<Long>() {            @Override            public int compare(Long o1, Long o2) {                if (o1.longValue() < o2.longValue()) {                    return -1;                } else if (o1.longValue() > o2.longValue()) {                    return 1;                }                return 0;            }        });        System.out.println(idList);        //java8        List<Long> sortIdList = idList.stream().sorted(Long::compareTo).collect(Collectors.toList());        System.out.println(sortIdList);        //java8        List<Integer> integerList = Arrays.asList(0, 3, 2, 1);        Collections.sort(integerList, Integer::compareTo);        System.out.println(integerList);    }

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