Question

You'll notice that in the LearnAboutLanguages class there are a few todos. You need to implement the three missing classes ( RussianSpeaker, JapaneseSpeaker and SwahiliSpeaker ). Then uncomment all the stuff marked "todo" and run the code!

Submit
1. Your three new .java files
2. A screenshot of your correct code running on your computer.

--

public class EnglishSpeaker implements LanguageSpeaker{

   @Override
   public String GetMyLanguage() {
       return "English";
   }

   @Override
   public String GetHi() {
       return "Hi";
   }

   @Override
   public String GetBye() {
       return "Bye";
   }
}
--

public interface LanguageSpeaker {
   String GetMyLanguage();
   String GetHi();
   String GetBye();
}
--

public class LearnAboutLanguages {
  
   public static void teachLanguage(LanguageSpeaker speaker) {
       System.out.println("Hello, I speak " + speaker.GetMyLanguage());
       System.out.println("To say \"hello\", we say: " + speaker.GetHi());
       System.out.println("To say \"bye\", we say: " + speaker.GetBye());
       System.out.println();
   }
  
   public static void main(String[] args) {
       LanguageSpeaker australian = new EnglishSpeaker();
       LanguageSpeaker uruguayan = new SpanishSpeaker();
       LanguageSpeaker mozambican = new PortugueseSpeaker();
      
       //TODO
       // LanguageSpeaker russian = new RussianSpeaker();
       // LanguageSpeaker japanese = new JapaneseSpeaker();
       // LanguageSpeaker kenyan = new SwahiliSpeaker();
      
       teachLanguage(australian);
       teachLanguage(uruguayan);
       teachLanguage(mozambican);
      
       //TODO
       //teachLanguage(russian);
       //teachLanguage(japanese);
       //teachLanguage(kenyan);
   }
}
--

public class PortugueseSpeaker implements LanguageSpeaker{

   @Override
   public String GetMyLanguage() {
       return "Português";
   }

   @Override
   public String GetHi() {
       return "olá";
   }

   @Override
   public String GetBye() {
       return "tchau";
   }
}
--

public class SpanishSpeaker implements LanguageSpeaker{

   @Override
   public String GetMyLanguage() {
       return "Español";
   }

   @Override
   public String GetHi() {
       return "Hola";
   }

   @Override
   public String GetBye() {
       return "Adios";
   }
}

Answer 1

I have implemented below three .java files::

1> RussianSpeaker.java :-

public class RussianSpeaker implements LanguageSpeaker{
    
    @Override
   public String GetMyLanguage() {
       return "русский";
   }

   @Override
   public String GetHi() {
       return "Здравствуй";
   }

   @Override
   public String GetBye() {
       return "до свидания";
   }
}

2> JapaneseSpeaker.java:-

public class JapaneseSpeaker implements LanguageSpeaker{
    
    @Override
   public String GetMyLanguage() {
       return "Японский";
   }

   @Override
   public String GetHi() {
       return "こんにちは";
   }

   @Override
   public String GetBye() {
       return "さようなら";
   }
}

3> SwahiliSpeaker.java

public class SwahiliSpeaker implements LanguageSpeaker{
    
    @Override
   public String GetMyLanguage() {
       return "Kiswahili";
   }

   @Override
   public String GetHi() {
       return "Hi";
   }

   @Override
   public String GetBye() {
       return "Kwaheri";
   }
}

Program :-

public class LearnAboutLanguages {
  
   public static void teachLanguage(LanguageSpeaker speaker) {
       System.out.println("Hello, I speak " + speaker.GetMyLanguage());
       System.out.println("To say \"hello\", we say: " + speaker.GetHi());
       System.out.println("To say \"bye\", we say: " + speaker.GetBye());
       System.out.println();
   }
  
   public static void main(String[] args) {
       LanguageSpeaker australian = new EnglishSpeaker();
       LanguageSpeaker uruguayan = new SpanishSpeaker();
       LanguageSpeaker mozambican = new PortugueseSpeaker();
      
       //TODO
       LanguageSpeaker russian = new RussianSpeaker();
       LanguageSpeaker japanese = new JapaneseSpeaker();
       LanguageSpeaker kenyan = new SwahiliSpeaker();
      
       teachLanguage(australian);
       teachLanguage(uruguayan);
       teachLanguage(mozambican);
      
       //TODO
       teachLanguage(russian);
       teachLanguage(japanese);
       teachLanguage(kenyan);
   }
}

Output:-

I hope you will understand the above program.

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Thank you.