A very simple Awesome interface

Awesome.java

public interface Awesome {
    
    /**
     * say hello!
     */
    void sayHello();
}

AwesomeSpaniard.java

public class AwesomeSpaniard implements Awesome {

    @Override
    public void sayHello() {
        System.out.println("Hola!");
    }

}

BasicMain.java

public class BasicMain {

    public static void main(String[] args) {
        
        List<Awesome> awesomePeople = new LinkedList<>();
        Awesome spaniard = new AwesomeSpaniard();
        awesomePeople.add(spaniard);
        
        Awesome indonesian = new AwesomeIndonesian();
        awesomePeople.add(indonesian);
        
        Awesome swedish = new AwesomeSwedish();
        awesomePeople.add(swedish);
        
        Awesome singaporean = new AwesomeSingaporean();
        awesomePeople.add(singaporean);
        
        awesomePeople.forEach(ap -> ap.sayHello());
    }

}

BasicMain.out

Hola!
Halo!
Hej hej!
Hello!