Тестовое задание по Java от компании Ecwid

Sometimes you want to make a complete copy of some object.

Something like this:

ComplexObject obj = ...

ComplexObject copy = CopyUtils.deepCopy(obj);

The problem is that classes in Java can be of arbitrary complexity - the number of class fields and their types are not regulated in any way. Moreover, the type system in Java is closed - elements of an array/list can be absolutely any data types, including arrays and lists. And also there are recursive data structures - when an object somewhere in its depths contains a reference to itself (or to a part of itself).

You need to write a deepCopy() method that takes all these nuances into account and works on objects of arbitrary structure and size.

Some details:

If you have any questions, feel free to write to join-ecom@lightspeedhq.com.
First of all, the method should work correctly. Speed is also important, but not as much as correctness

You can only use the features of the standard J2SE library

Code should be written in Java (version 21 and above) or Kotlin.
The assignment must have a working main() method, to demonstrate how it works

The completed assignment should be posted on GitHub

P.S. I know about hacks with java.io.Serializable and java.lang.Cloneable, please don't use them

Before submitting, I recommend testing the solution on a class like this:

class Man {
private String name;
private int age;
private List<String> favoriteBooks;

public Man(String name, int age, List<String> favoriteBooks) {
    this.name = name;
    this.age = age;
    this.favoriteBooks = favoriteBooks;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

public List<String> getFavoriteBooks() {
    return favoriteBooks;
}

public void setFavoriteBooks(List<String> favoriteBooks) {
    this.favoriteBooks = favoriteBooks;
}

}