Java:将文件中的对象读取到不同的派生类中

import java.io.*;

class Parent implements Serializable {
    private static final long serialVersionUID = 1L;
    protected String name;

    public Parent(String name) {
        this.name = name;
    }
}

class Child extends Parent {
    private static final long serialVersionUID = 1L;
    private int age;

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

    public void display() {
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);
    }
}

public class Main {
    public static void main(String[] args) {
        try {
            FileInputStream fileIn = new FileInputStream("objects.ser");
            ObjectInputStream in = new ObjectInputStream(fileIn);
            Child child = (Child) in.readObject();
            in.close();
            fileIn.close();
            child.display();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}