This is a stub. It needs an example of an error caused due to by using the Base base class's object where the subclass's object was expected. It should not produce a RuntimeException (ClassCastException) to qualify.
When a non-final nonfinal class defines a clone() method that does not call super.clone(), cloning a subtype will produce an object of the wrong type.
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This compliant solution correctly calls super.clone() in the Base class's clone() method.
| Code Block | ||
|---|---|---|
| ||
class Base implements Cloneable {
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
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 Derived, as expected
devClone.doLogic(); // prints "Subclass doLogic", as expected
} catch (CloneNotSupportedException e) { /* ... */ }
}
}
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