stream流多字段排序

对于多字段排序，你可以使用Java的Stream API来处理。下面是一个示例代码，演示了如何使用Stream流进行多字段排序：

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

class Person {
    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }
}

public class Main {
    public static void main(String[] args) {
        List<Person> people = new ArrayList<>();
        people.add(new Person("Alice", 25));
        people.add(new Person("Bob", 30));
        people.add(new Person("Charlie", 20));

        // 按姓名升序，年龄降序排序
        Comparator<Person> nameComparator = Comparator.comparing(Person::getName);
        Comparator<Person> ageComparator = Comparator.comparing(Person::getAge).reversed();

        List<Person>