Java Annotations, que bruxaria é essa?

Printable.java

public @interface Printable {

}

Printable2.java

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Printable {

}

PrintableAtributo.java

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Printable {
  String label();
}

Printer.java

import java.lang.reflect.Method;
import java.util.List;

public class Printer {
  public void print(List<User> users) {
    System.out.println("Listagem de usuários:");
    try {
      for (User user : users) {
        StringBuilder userData = new StringBuilder();

        for (Method method : user.getClass().getDeclaredMethods()) {
          if (method.isAnnotationPresent(Printable.class)) {
            Printable printableMeta = method.getAnnotation(Printable.class);

            userData.append(printableMeta.label()).append(": ").append(method.invoke(user)).append(", ");
          }
        }

        System.out.println(userData.toString());
      }
    } catch (Exception e) {
      System.err.println("Error!");
    }
  }
}

User.java

public class User {
  
  // atributos e construtores omitidos
  
  public String getName(){
    return this.name;
  }
  
  public int getAge(){
    return this.age;
  }
  
  public String getEmail(){
    return this.email;
  }
  
  public String getPassword(){
    return this.password;
  }
  
}

UserAnnotation.java

public class User {
  
  // atributos e construtores omitidos
  
  @Printable(label = "Nome")
  public String getName(){
    return this.name;
  }
  
  @Printable(label = "Idade")
  public int getAge(){
    return this.age;
  }
  
  @Printable(label = "Email")
  public String getEmail(){
    return this.email;
  }
  
  public String getPassword(){
    return this.password;
  }
  
}