// interfaces/HorrorShow.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Extending an interface with inheritance

interface Monster {
 void menace();
}

interface DangerousMonster extends Monster {
 void destroy();
}

interface Lethal {
 void kill();
}

class DragonZilla implements DangerousMonster {
 @Override
 public void menace() {}
 @Override
 public void destroy() {}
}

interface Vampire extends DangerousMonster, Lethal {
 void drinkBlood();
}

class VeryBadVampire implements Vampire {
 @Override
 public void menace() {}
 @Override
 public void destroy() {}
 @Override
 public void kill() {}
 @Override
 public void drinkBlood() {}
}

public class HorrorShow {
 static void u(Monster b) { b.menace(); }
 static void v(DangerousMonster d) {
 d.menace();
 d.destroy();
 }
 static void w(Lethal l) { l.kill(); }
 public static void main(String[] args) {
 DangerousMonster barney = new DragonZilla();
 u(barney);
 v(barney);
 Vampire vlad = new VeryBadVampire();
 u(vlad);
 v(vlad);
 w(vlad);
 }
}