Re: Exception Names

From:
=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
Newsgroups:
comp.lang.java.programmer
Date:
Sun, 29 Mar 2009 09:10:04 -0400
Message-ID:
<49cf7328$0$90265$14726298@news.sunsite.dk>
Mike Schilling wrote:

Arne Vajh?j wrote:

Mike Schilling wrote:

Lew wrote:

rossum wrote:

On Fri, 27 Mar 2009 11:58:20 +0000, Tom Anderson
<twic@urchin.earth.li> wrote:

InputStream.read should throw an EOFException instead of
returning
-1 at the end of a stream. Checking return values for special
values is goofy C bullshit that we shouldn't be doing in the
21st
century.

It may bee goofy but it is very likely to be a whole lot faster.
Throwing and catching an exception is probably going to be a lot
slower than checking the return value.

Besides, there's nothing exceptional about reaching the end of a
stream. One would venture to say that one nearly always reaches
the
end of a stream, *unless* something exceptional happens.

Right; the most Java-ish thing would be for Streams to be
iterator-like:

    while (stream.hasNext())
    {
        char c = stream.next();
    }

or even

    for (char c: stream)
    {
    }

1) performance would most likely not be good.


Because of two method calls rather than one?


Yes.

2) semantics could become very confusing - either hexNext
   would do the actual read or for some types of streams next
   could fail even ig hasNext returned true


The semantics would have to be well-defined.


Well-defined is required but not sufficient to make it good.

                                             Since we're not assuming
any asynchrony, I'd expect hasNext() to do actual I/O, if that's
necessary to ensure that a character is available.


I don't think that is intuitive.

                                                   (This is hidden
when the for loop is used, anyway.)


True.

It is only a problem when used more explicit.

Arne

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