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In this noncompliant code example, the clone() method in the class Base fails to call super.clone(). For that reason, the object devClone ends up being of type Base instead of Derived, with resulting incorrect application of the doLogic() method.
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class Base implements Cloneable {
public Object clone() throws CloneNotSupportedException {
return new Base();
}
protected void doLogic() {
System.out.println("Superclass doLogic");
}
}
class Derived extends Base {
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
protected void doLogic() {
System.out.println("Subclass doLogic");
}
public static void main(String[] args) {
Derived dev = new Derived();
try {
Base devClone = (Base)dev.clone(); // Has type Base instead of Derived
devClone.doLogic(); // Prints "Superclass doLogic" instead of "Subclass doLogic"
} catch (CloneNotSupportedException e) { /* ... */ }
}
}
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Consequently, the object devClone ends up being of type Base instead of Derived and the doLogic() method is incorrectly applied.
Compliant Solution
This compliant solution correctly calls super.clone() in the Base class's clone() method:
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