Introducing Exceptions in Overridden Methods

[J.Pena]

Hello everybody! I'd like to request any comments or help on this matter:

When overriding one of the methods of the AWT Listener classes, I have
introduced (or signalled) an exception which of course is not signalled
in the parent class. Specifically, when coding an 'actionPerformed'
method of the ActionListener interface I have created an object and used
one of its methods which may throw an IOException. My compile fails
because MY version of the method signals the exception but the
ActionListener interface does NOT.

I tried moving the method call which signals the exception to another
('convenience') method but the compile still failed because of a 'forward
reference' to a method which signals the exception.

It seems that if you have a ..

  method abc()

.which does not signal any exceptions you cannot then override it with
say,

  method abc() signal IOException

.but I'm not sure yet how to resolve this--I certainly need the IO
functionality which happens to signal the exception!
Thanks!

---------------
cjpena
[hidden email]
---------------

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[Massimiliano Marsiglietti]

> .but I'm not sure yet how to resolve this--I certainly need the IO
> functionality which happens to signal the exception!

Err.. What about actually catching the exception?

In NetRexx:

 do
  -- your code
 catch IOException
  -- code that handles IOException
 end

Max

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[Mike Cowlishaw-2]

That's the way Java works, I'm afraid.  You must catch the exception  in your
method.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Mike Cowlishaw, IBM Fellow, IBM UK Laboratories
mailto:[hidden email]   [http://www2.hursley.ibm.com]
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