What is the result?

duff

but nothing about package names
So A, tested with this code:
–first file
public interface Rideable {

String ride();
}
–second file
public class Horse implements Rideable {

@Override
public String ride() {
return “cantering”;
}

}
–third file
public class Icelandic extends Horse {

@Override
public String ride() {
return “tolting”;
}
}
–forth file
public class Test1 {

public static void main(String[] args) {

Rideable r1 = new Icelandic();
Rideable r2 = new Horse();
Horse h1 = new Icelandic();
System.out.println(r1.ride() + ” ” + r2.ride() + ” ” + h1.ride());
}

}