Re: Help needed.

From	lewbloch <lewbloch@gmail.com>
Newsgroups	comp.lang.java.help
Subject	Re: Help needed.
Date	2011-07-28 08:50 -0700
Organization	http://groups.google.com
Message-ID	<f9f7c570-4d0b-4ab7-91a5-b1e839735fab@f39g2000prb.googlegroups.com> (permalink)
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neil furnival wrote:
> markspace wrote:
>> neil furnival wrote:
>
>>> Exception in thread "main" java.lang.NullPointerException
>>> reply = myScanner.findInLine(".").charAt(0);
>
>> You should learn how to debug your own programs, it's an important part
>> of programming.
>>
>> My guess is in the line above the pattern "." was not found and
>> findInlIne() returned null:
>>
>> "If no such pattern is detected in the input up to the next line
>> separator, then null is returned"
>>
>> <http://download.oracle.com/javase/6/docs/api/java/util/Scanner.html#f...>
>>
>> I'll let you discover how to verify that this is indeed the problem, and
>> what to do about it.
>
> sorted. replaced

What did you sort?

> reply = myScanner.next().charAt(0);
>
> in place of
>
> reply = myScanner.nextInLine(".").charAt(0);
>
> And works thanks for your reply.

"works" is such a strong word.  The call to 'Scanner#next()' can fail
in interesting ways that could break your code.

Check the Javadocs for details.

(Note that 'Scanner#nextInLine()' takes a pattern, not a literal
string, as its argument.)

--
Lew

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Thread

Help needed. neil furnival <neil.furnival@googlemail.com> - 2011-07-26 15:47 -0700
  Re: Help needed. markspace <-@.> - 2011-07-26 17:13 -0700
    Re: Help needed. neil furnival <neil.furnival@googlemail.com> - 2011-07-27 01:49 -0700
      Re: Help needed. lewbloch <lewbloch@gmail.com> - 2011-07-28 08:50 -0700
        Re: Help needed. lewbloch <lewbloch@gmail.com> - 2011-07-30 16:19 -0700
    Re: Help needed. Gene Wirchenko <genew@ocis.net> - 2011-07-27 11:33 -0700
  Re: Help needed. Roedy Green <see_website@mindprod.com.invalid> - 2011-07-26 22:09 -0700

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