Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.help > #1058

Re: How would you do this kind of validatioin checking

Show all headers | View raw

On Tue, 13 Sep 2011 08:44:00 -0500, "Thee Chicago Wolf [MVP]" <.@.>
wrote, quoted or indirectly quoted someone who said :

>As one of the other posters suggested, it could be set up to throw an
>exception and loop until valid input is entered. Right now we're not
>up to exceptions in my class but it seems to be down the road so I am
>going to read ahead and see if I can get the gist of how exceptions
>work. Thanks much!

You could then have your nextInt check for validity and return a flag.

Without exceptions, it would be somewhat awkward to validate and
convert to int.  You would have to recreate the logic inside
Integer.parseInt.  I used to teach a tutorial in  computer science at
UBC.  If one of my students used a feature we had not covered yet, I
would be very happy, so long as it was clear he/she had not just been
handed the answer by an advanced student.

If I were you, I would just read up on exceptions. They are not that
difficult, much easier than trying to reinvent the wheel. They were
invented because of the way propagating flags can get so awkward in C.

-- 
Roedy Green Canadian Mind Products
http://mindprod.com
The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, 
the search for a superior moral justification for selfishness.
~ John Kenneth Galbraith (born: 1908-10-15 died: 2006-04-29 at age: 97) 

Back to comp.lang.java.help | Previous | Next — Previous in thread | Find similar

Thread

How would you do this kind of validatioin checking "Thee Chicago Wolf (MVP)" <.@.> - 2011-09-12 20:12 -0500
  Re: How would you do this kind of validatioin checking Knute Johnson <nospam@knutejohnson.com> - 2011-09-12 18:44 -0700
  Re: How would you do this kind of validatioin checking Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-12 21:58 -0400
    Re: How would you do this kind of validatioin checking "Thee Chicago Wolf [MVP]" <.@.> - 2011-09-13 08:41 -0500
  Re: How would you do this kind of validatioin checking Roedy Green <see_website@mindprod.com.invalid> - 2011-09-12 21:59 -0700
    Re: How would you do this kind of validatioin checking "Thee Chicago Wolf [MVP]" <.@.> - 2011-09-13 08:44 -0500
      Re: How would you do this kind of validatioin checking Roedy Green <see_website@mindprod.com.invalid> - 2011-09-13 12:27 -0700

csiph-web