import java.util.*;
import java.lang.*;
import java.io.*;

class InterfaceExample{
        public static void main (String[] args){
                MyInterface[] iList = {new ImplOne(), new ImplTwo()};
 
                for (MyInterface i : iList) {
                        System.out.println(i.getString());
                }
        }
}
 
interface MyInterface{
        public String getString();
}
 
class ImplOne implements MyInterface{
        @Override
        public String getString(){ return "Who am I?"; }
}
 
class ImplTwo implements MyInterface{
        @Override
        public String getString(){ return "I am YOU."; }
}