staticfactor7.java

public class Account {
  private final User user;
  private final String id;
  
  public Account(AccountResponse response) {
    id = response.id;
    user = User.newUser(response.userResponse);
  }
}

public class User {
  private final String id;
  private final String name;
  
  public static User newUser(UserResponse response) {
    if (response == null) {
      return null;
    }
    return new User(response);
  }
  
  public User(UserResponse response) {
    id = response.id;
    name = response.name;
  }
}