Sybex Practice Tests 11 - Chapter 3 - Q #58

[Andrey Kotelnikov]

package desert;
 
interface CanBurrow {
   public abstract void burrow();
}
 
@FunctionalInterface interface HasHardShell
   extends CanBurrow {} 
 
abstract class Tortoise implements HasHardShell {
   public abstract int toughness();
}
 
public class DesertTortoise extends Tortoise {
   public int toughness() { return 11; }
}

Option D is a correct answer. But it says "The DesertTortoise interface does not compile."
It should be fixed to "The DesertTortoise CLASS does not compile."

[Jeanne Boyarsky]

Confirmed and added to the errata. Thanks!

[Toby Melskens]

There are more mistakes with this question.
1. Turtoise is also a class not an interface
2. As Turtoise and DesertTurtoise are classes and not interfaces, option E is also correct.

[Jeanne Boyarsky]

1) True. Luckily that doesn't change the answer.
2) So it does. I'll make sure we get that fixed in the Java 17 book