horrorshow.java

java包和接口部分的课件

//: c08:HorrorShow.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Extending an interface with inheritance.

interface Monster {
  void menace();
}

interface DangerousMonster extends Monster {
  void destroy();
}

interface Lethal {
  void kill();
}

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

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

class HorrorShow {
  static void u(Monster b) { b.menace(); }
  static void v(DangerousMonster d) {
    d.menace(),    d.destroy();
  }
  public static void main(String[] args) {
    DragonZilla if2 = new DragonZilla();
    u(if2);
    v(if2);
  }
} ///:~