Experience in transferring parameters of complex user objects from the design stage to the program execution process?

Transferring parameters of complex user objects from the design stage to the program execution process is usually implemented through serialization and deserialization, or through passing objects via interfaces or methods.

For example, in Java, you can use the Serializable interface to save the state of an object and restore it later:

import java.io.*;

class User implements Serializable {
    private String name;
    private int age;

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

    // getters and setters
}

// Serializing the object
User user = new User("Ivan", 30);
try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("user.dat"))) {
    oos.writeObject(user);
}

// Deserializing the object
try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream("user.dat"))) {
    User loadedUser = (User) ois.readObject();
}

You can also use design patterns, such as Builder, to create complex objects with parameters at runtime.