Sort排序

场景一：普通排序
正序（升序）
list = list.stream().sorted().collect(Collectors.toList());
list = list.stream().sorted(Comparator.comparing(Student::getAge))
倒序（降序）
list = list.stream().sorted(Comparator.reverseOrder())
list = list.stream().sorted(Comparator.comparing(Student::getAge).reversed())

场景二：含空值排序
含空值的正序（升序）排序(按创建时间排序)
list = list.stream().sorted(Comparator.comparing(stu -> stu.getCreateTime(), Comparator.nullsFirst(Date::compareTo))).collect(Collectors.toList());

场景三：不用Stream
// 正序
list = list.sort(Comparator.comparing(Integer::intValue));
list = list.sort(Comparator.comparing(Student::getAge));
// 倒序
list = list.sort(Comparator.comparing(Integer::intValue).reversed());
list = list.sort(Comparator.comparing(Student::getAge).reversed());

List<String> list = Arrays.asList("banana", null, "apple", "cherry", null, "date");

// 使用nullsFirst，将null值排在非null值前面
    List<String> sortedListNullsFirst = list.stream()
            .sorted(Comparator.nullsFirst(Comparator.naturalOrder()))
            .collect(Collectors.toList());

// 使用nullsLast，将null值排在非null值后面
    List<String> sortedListNullsLast = list.stream()
            .sorted(Comparator.nullsLast(Comparator.naturalOrder()))
            .collect(Collectors.toList());

// 打印排序结果
    sortedListNullsFirst.forEach(System.out::println);
    sortedListNullsLast.forEach(System.out::println);

`
参考：
https://www.w3cschool.cn/java/codetag-stream-stream_sort.html