如何从java集合中的java对象访问变量？

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        // 创建一个ArrayList对象
        ArrayList<Person> personList = new ArrayList<>();

        // 添加Person对象到ArrayList
        personList.add(new Person("John", 25));
        personList.add(new Person("Jane", 30));

        // 从ArrayList中获取第一个Person对象
        Person firstPerson = personList.get(0);

        // 访问Person对象的变量
        System.out.println("Name: " + firstPerson.name);
        System.out.println("Age: " + firstPerson.age);
    }
}

class Person {
    String name;
    int age;

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