[2122] in java-interest
Re: throws declataration in Java/beta
daemon@ATHENA.MIT.EDU (Arthur van Hoff)
Mon Sep 25 21:42:29 1995
Date: Mon, 25 Sep 1995 16:33:32 -0800 (PDT)
From: Arthur van Hoff <Arthur.Vanhoff@Eng.Sun.COM>
Reply-To: Arthur van Hoff <Arthur.Vanhoff@Eng.Sun.COM>
To: dufourd@enst.enst.fr
Cc: java-interest@java.Eng.Sun.COM
Hi,
> >This means that you can NEVER throw an exception from a
> >toString() method because Object.toString() doesn't throw
> >any exceptions.
>
> This is my experience too, and this language/compiler design decision
> seems pretty lame to me. Another thing you cannot do is ask for the
> current thread to sleep when you are in the run method because the
> interface Runnable does not specify "throws InterruptedException"...
> I am sure there are lots of other such examples.
It is very important to realize that a Java class is a guaranteed interface.
If an method is declared to throw a certain set of exceptions than there is no
way a sub class can change that. At first this may seem restrictive, but after
a while you will realize that it is wonderful to have this guarantee.
Have fun,
Arthur van Hoff
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