OnJava8-Examples/interfaces/HorrorShow.java
2016-01-25 18:05:55 -08:00

58 lines
1.2 KiB
Java

// interfaces/HorrorShow.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ 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);
}
}