如何更改可观察集合元素中的类的属性？

import java.util.ArrayList;
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 void setAge(int age) {
        this.age = age;
    }

    public String toString() {
        return "Name: " + name + ", Age: " + age;
    }
}

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

        // 更改第一个人的年龄为35
        people.get(0).setAge(35);

        // 打印更新后的集合
        for (Person person : people) {
            System.out.println(person);
        }
    }
}