从Java映射流中，按键对它们进行分组，并发现最大值未按预期工作

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        List<Person> persons = List.of(
                new Person("Alice", 25),
                new Person("Bob", 30),
                new Person("Alice", 35),
                new Person("Bob", 20)
        );

        Map<String, Person> maxAgeByPerson = persons.stream()
                .collect(Collectors.groupingBy(Person::getName,
                        Collectors.maxBy(Comparator.comparingInt(Person::getAge))));

        System.out.println(maxAgeByPerson);
    }

    static 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;
        }

        @Override
        public String toString() {
            return "Person{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    '}';
        }
    }
}