Mega Code Archive
You can insert Cloneability at any level of inheritance
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// : appendixa:HorrorFlick.java
// You can insert Cloneability at any level of inheritance.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
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 RuntimeException(e);
}
}
}
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();
}
} ///:~
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