Exceptions

[Prasanna Raman]

Hello All,
Why should the subclass methods not throw a broader exception than the overridden super class method?

Kindly explain with examples.


Thanks,
Prasanna

[Abimaran Kugathasan]

Prasanna Raman wrote:Hello All,
Why should the subclass methods not throw a broader exception than the overridden super class method?

Kindly explain with examples.


Thanks,
Prasanna

If we allowed to do that, then how do you resolve the polymorphic invocation of methods?

[Prasanna Raman]

Could you please give me an example?

I know the answer is that it would affect run-time polymorphism but I am not able to quite comprehend how that would work.

Thanks,
Prasanna

[Campbell Ritchie]

Since you cross-posted here (thank you, DB, for noticing), people will assume you have cross-posted again, and will be reluctant to answer.

[Rob Spoor]

Check out the Liskov substitution principle.

In this case, in short, a calling class expects only a few exception types. If then another exception is thrown it doesn't know how to handle it.

[David Newton]

This question, while superficially different, is basically the same question you asked about method overriding, and the answers are the same.

[Campbell Ritchie]

David Newton wrote:This question, while superficially different, is basically the same question you asked about method overriding, and the answers are the same.

In which case, please read this FAQ, while I "pull rank" and close this thread.