Re: Where shoul I throw RuntimeException

From:
Eric Sosman <Eric.Sosman@sun.com>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 21 May 2009 10:47:33 -0400
Message-ID:
<1242917245.700724@news1nwk>
Giovanni Azua wrote:

"Lew" <noone@lewscanon.com> wrote in message
news:gv3k29$1oo$1@news.albasani.net...

don't think that IllegalArgumentException should be used in the JDK in
the way it does now, the right tool should be assertions, because
assertions were added later to the language, I think from 1.4.x most
likely this is a backward compatibility issue.

That is very wrong. Assertions are not exceptions and cannot nor should
not be used for argument checking on public methods.


because ... ?


     Because they can be turned off at run-time, leaving you
with no validity-checking at all.

     Here's a little experiment you might want to try. See
if you can explain why the compiler is happy with the first
method but complains about the second:

    int method1(int x) {
        if (x > 0) return x;
        throw new IllegalArgumentException("bad x");
    }

    int method2(int x) {
        if (x > 0) return x;
        assert false : "bad x";
    }

--
Eric.Sosman@sun.com

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