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Groups > comp.lang.java.programmer > #35395
| From | Eric Sosman <esosman@comcast-dot-net.invalid> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: What happens when format gets a wrong argument |
| Date | 2016-08-18 17:31 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <np59f7$vj5$1@dont-email.me> (permalink) |
| References | <87eg5lkd05.fsf@Equus.decebal.nl> |
On 8/18/2016 5:01 PM, Cecil Westerhof wrote:
> I had a function in ScheduledExecutorService where I changed a
> parameter for format from long to double, but I forgot to change the
> format string. The result was that the function gets an unchecked
> IllegalFormatConversionException and silently terminated on the format
> statement. Is this normal? And where do I find a good description
> about this?
It's normal. Java's printf-inspired format strings are not quite
as good as C's, because C compilers (by and large) are able to sanity-
check the formats at compile time while JavaC doesn't (yet, anyhow).
For a description, see the JavaDoc for java.util.Formatter, which
says (near the top) "[...] Java formatting is more strict than C's; for
example, if a conversion is incompatible with a flag, an exception will
be thrown." (It also says "In C inapplicable flags are silently
ignored," which is wrong -- but inability to comprehend C is to be
expected from Java folks, who can't even grok "unsigned.")
> Is there a way to get things automatically logged?
Don't make misteaks? :(
--
esosman@comcast-dot-net.invalid
The Tooth Fairy has gone high-tech, now pays in Bitecoin.
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What happens when format gets a wrong argument Cecil Westerhof <Cecil@decebal.nl> - 2016-08-18 23:01 +0200
Re: What happens when format gets a wrong argument Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-08-18 17:31 -0400
Re: What happens when format gets a wrong argument Arne Vajhøj <arne@vajhoej.dk> - 2016-08-18 19:21 -0400
Re: What happens when format gets a wrong argument Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-08-19 08:22 -0400
Re: What happens when format gets a wrong argument Gene Wirchenko <genew@telus.net> - 2016-08-19 10:40 -0700
Re: What happens when format gets a wrong argument Arne Vajhøj <arne@vajhoej.dk> - 2016-08-19 20:19 -0400
Re: What happens when format gets a wrong argument Cecil Westerhof <Cecil@decebal.nl> - 2016-08-19 01:25 +0200
Re: What happens when format gets a wrong argument Arne Vajhøj <arne@vajhoej.dk> - 2016-08-18 19:31 -0400
Re: What happens when format gets a wrong argument Arne Vajhøj <arne@vajhoej.dk> - 2016-08-18 19:35 -0400
Re: What happens when format gets a wrong argument Cecil Westerhof <Cecil@decebal.nl> - 2016-08-19 07:23 +0200
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