discussion.java

Public Class Account {
   
  String accountService = null;
  EmailService emailService = null;
  
  public setAccountEmailProviderName(accountEmailProvider){
    this.accountService =  accountEmailProvider;
  }
  
  public void setupAccount(){
  
    if (accountService == "google"){

      emailService = Class.forName('GmailEmailProvider').getInstance();
    }
    
    else if(accountService == "yahoo"){

      emailService = Class.forName('YahooEmailProvider').getInstance();
    }
    
    else {

      emailService = Class.forName('HotmailEmailProvider').getInstance();

    }
      
      MailInit init = new MailInit(userName, password, emailService);
  }

}

public Class MailInit{
  
  public void initialConfiguration(String userName, String password, EmailService emailService ){
    MailConfiguration.userName = userName;
    MailConfiguration.password = password;
    MailConfiguration.emailService = emailService; 
  }
}