Java Reflection nested objects

Question

Hello, good afternoon everyone.

I’m studying java Reflection and my question is whether it would be possible and how to pick up nested objects dynamically as in the example below:

public class Rg{
       Integer numRg;
}
public class Pessoa{ 
       String nome;
       Rg rg;
}

Thank you very much!

Answer 1

Yes, you can access the attributes of a class through the functions getDeclaredFields() and getType(), and keep repeating until you get where you want.

Class pessoaClass = Pessoa.class;
Field[] pessoaFields = pessoaClass.getDeclaredFields();

for (Field pessoaField : pessoaFields) {
    if (pessoaField.getName() == "rg") {
        Class rgClass = pessoaField.getType();
        Field[] rgFields = rgClass.getDeclaredFields();
        for (Field rgField : rgFields) {
            System.out.println(rgField.getName());
        }
    }
}