JavaStreamsorted排序使用教程

List numbers = Arrays.asList(5, 2, 8, 1);
List sorted = numbers.stream()
    .sorted()
    .collect(Collectors.toList());
// 结果：[1, 2, 5, 8]

List words = Arrays.asList("apple", "hi", "banana");
List sortedByLength = words.stream()
    .sorted(Comparator.comparing(String::length))
    .collect(Collectors.toList());
// 结果：["hi", "apple", "banana"]

.sorted(Comparator.comparing(String::length).reversed())

class Person {
  private String name;
  private int age;
  // 构造函数、getter等省略
}

List people = ...;
List sortedByAge = people.stream()
    .sorted(Comparator.comparing(Person::getAge))
    .collect(Collectors.toList());

.sorted(Comparator.comparing(Person::getAge)
    .thenComparing(Person::getName))