Re: How to detect a "blank" line.

["Soumyanath Chatterjee" <soumya_chatt@xxxxxxxxxxx>]

Why not just use *sed* and delete the blank lines

- - Soumya
- ----- Original Message -----
From: Aranya <aranya@xxxxxxxxxx>
To: <linux-india@xxxxxxxxx>
Sent: Thursday, July 08, 1999 10:36 PM
Subject: Re: How to detect a "blank" line.


>
>
> >Hi,
> >
> >In your java program, exchange the line
> > if (s1.charAt(0)!='#') { // not a comment or NULL line
> >with
> > if (s1.equals("") || s1.charAt(0)!='#') { // not a comment or NULL line
> >
> >Explanation:
> >You get empty lines as empty strings from readLine(). So you first have
> >to check whether the string s1 is empty. This is done with
> >s1.equals(""). If this yields true, the evaluation of the conditionalin
> >the if-statement is terminated, you get true. I the string is not empty,
> >the evaluation is continued. Now, that you know that the string is NOT
> >empty, you can check for the first character. If you try to check the
> >first character without knowing for shure that the string is not empty,
> >this will throw errors, since empty strings have no characters.
> >
> There's a slight problem with this too. What if the so-called empty line
is
> not just a '\n' but  a few whitespaces followed by a '\n'? I think it's a
> better option to use a StreamTokenizer or a StringTokenizer. That way, you
> eliminate the whitespaces.
>
> Akshat
>
>
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