StreamTokenizer question

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Philippe - 04 Jun 2007 19:47 GMT

Hi all.

I'm trying to read a file with many entry. Thus, the first colum is a date.
Here's a row example :

08/22/05 15:18:47 21.00 0.00 0.00 -0.113 -1861.3 397.7 169.4 38.8 8.7

When I'm reading the first token (I'm using StreamTokenizer class) the first
token is 08.0. It looks like he consider the first one as a number. I
would like to ead the first token as 08/22/05.

I tryed to use st.ordinaryChar('/'); but it dont hlep me.

So my question is, how I can read the first token as a string instead of 3
oken considered as numerical.

Best regards,
Phil

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Hunter Gratzner - 04 Jun 2007 23:32 GMT

> 08/22/05 15:18:47 21.00 0.00 0.00 -0.113 -1861.3 397.7 169.4 38.8 8.7
>
> When I'm reading the first token (I'm using StreamTokenizer class)

StreamTokenizer is good for nothing. Use String.split("\\s+") on each
input line.

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Arne Vajhøj - 05 Jun 2007 01:48 GMT

> I'm trying to read a file with many entry. Thus, the first colum is a date.
> Here's a row example :
[quoted text clipped - 9 lines]
> So my question is, how I can read the first token as a string instead of 3
> oken considered as numerical.

Try look at this code:

package june;

import java.util.StringTokenizer;

public class ST {
public static void main(String[] args) {
String s = "08/22/05 15:18:47 21.00 0.00 0.00 -0.113 -1861.3
397.7 169.4 38.8 8.7";
StringTokenizer st = new StringTokenizer(s);
while(st.hasMoreTokens()) {
System.out.println(st.nextToken());
}
String[] parts = s.split(" ");
for(int i = 0; i < parts.length; i++) {
System.out.println(parts[i]);
}
}
}

You can easily parse the strings to int or Date if needed.

Arne

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Lew - 05 Jun 2007 03:40 GMT

> Try look at this code:
>
[quoted text clipped - 18 lines]
>
> You can easily parse the strings to int or Date if needed.

Try looking at this information, also:
<http://en.wikipedia.org/wiki/Cross-posting>

> This is distinct from 'double posting' [a.k.a. "multi-posting"] which involves posting multiple messages, each posted to a single forum, newsgroup, or topic area.

and
<http://en.wikipedia.org/wiki/Top-posting#Top-posting>

These groups generally respond better to "interleaved posting", also called
"inline posting".

Signature

Lew

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Juan Pedro Villa - 05 Jun 2007 03:54 GMT

On Jun 4, 7:48 pm, Arne Vajh?j <a...@vajhoej.dk> wrote:

> package june;
> import java.util.StringTokenizer;
[quoted text clipped - 11 lines]
> }
> }

The split method throws PatternSyntaxException if the regular
expression's syntax is invalid. It doesn't change much, but I prefer
to consider the possibility of catching the exception:

import java.util.regex.PatternSyntaxException;

public class Main {

public static void main(String[] args) {
    String str = "08/22/05 15:18:47 21.00 0.00 0.00 " +
    "-0.113 -1861.3 397.7 169.4 38.8 8.7";
    try {
    String[] tokens = str.split(" ");
    for (int i = 0; i < tokens.length; i++) {
        System.out.println(tokens[i]);
    }
    } catch (PatternSyntaxException e) {
    System.err.println(e.getMessage());
    }
}

}

The result of this little program is:

08/22/05
15:18:47
21.00
0.00
0.00
-0.113
-1861.3
397.7
169.4
38.8
8.7

And, as Arne said, you can deal with that if you need to.

Regards,
Juan Pedro Villa

Reply to this Message

Arne Vajhøj - 06 Jun 2007 00:44 GMT

> The split method throws PatternSyntaxException if the regular
> expression's syntax is invalid. It doesn't change much, but I prefer
> to consider the possibility of catching the exception:

> try {
> String[] tokens = str.split(" ");

>     } catch (PatternSyntaxException e) {
>     System.err.println(e.getMessage());
>     }

Considering that the pattern is hardcoded, then that could
be considered an overkill.

Arne

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