List中如何按属性排序呢?

 借助Stream 中的sorted
 

 Stream排序
 
正序
   List<Person> collect = personList.stream()
                            .sorted(Comparator.comparing(Person::getUploadTime))
							.collect(Collectors.toList());

倒序
   List<Person> collect = personList.stream()
                            .sorted((p1, p2) -> p2.getUploadTime().compareTo(p1.getUploadTime()))
							.collect(Collectors.toList());

2.List sort，直接给List排序

正序
  personList
  .sort(Comparator.comparing(Person::getUploadTime));

倒序
  personList.sort((p1, p2) -> p2.getUploadTime()
    .compareTo(p1.getUploadTime()));