Java,如何在永久文件中保存值并从中加载

import java.io.*;

public class Person implements Serializable {
    private String name;
    private int age;

    // 构造方法、getter和setter等省略

    public static void main(String[] args) {
        Person person = new Person("John", 25);

        try {
            FileOutputStream fileOut = new FileOutputStream("person.ser");
            ObjectOutputStream out = new ObjectOutputStream(fileOut);
            out.writeObject(person);
            out.close();
            fileOut.close();
            System.out.println("Person对象已序列化并保存到person.ser文件中");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.*;

public class Person implements Serializable {
    private String name;
    private int age;

    // 构造方法、getter和setter等省略

    public static void main(String[] args) {
        try {
            FileInputStream fileIn = new FileInputStream("person.ser");
            ObjectInputStream in = new ObjectInputStream(fileIn);
            Person person = (Person) in.readObject();
            in.close();
            fileIn.close();
            System.out.println("从person.ser文件中加载并反序列化Person对象");
            System.out.println("姓名：" + person.getName());
            System.out.println("年龄：" + person.getAge());
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}