//: HorrorFlick.java
import java.util.*;
/**
 * You can insert Cloneability at any
 * level of inheritance.
*/
class Person {}
class Hero extends Person {}
class Scientist extends Person 
    implements Cloneable {
  public Object clone() {
    try {
      return super.clone();
    } catch (CloneNotSupportedException e) {
      // this should never happen:
      // it's Cloneable already!
      throw new InternalError();
    }
  }
}
class MadScientist extends Scientist {}

public class HorrorFlick {
  public static void main(String args[]) {
    Person p = new Person();
    Hero h = new Hero();
    Scientist s = new Scientist();
    MadScientist m = new MadScientist();

    // p = (Person)p.clone(); // Compile error
    // h = (Hero)h.clone(); // Compile error
    s = (Scientist)s.clone();
    m = (MadScientist)m.clone();
  }
} ///:~