Scanner...K&B p.no:484

[Ganeshkumar cheekati]

import java.util.*;
class ScannerTest
{
public static void main(String[] a)
{
System.out.println("input:");
System.out.flush();
try{
Scanner s=new Scanner(System.in);
String token;
do
{
token=s.findInLine(a[0]);
System.out.println("found " + token);
} while (token != null);
} catch (Exception e) { System.out.println("scan exc"); }
}
}

it is always giving output as found null eventhough i am giving input at runtime...

[Ankit Garg]

ganesh can you please tell what you are passing as parameter to the program i.e. the command line arguments and what are you providing input when prompted???

[Ganeshkumar cheekati]

i am giving input as :34adkjg345kjh

and a[0]="\d\d"
[ November 11, 2008: Message edited by: Ganeshkumar cheekati ]

[Ankit Garg]

try a[0] as "\\d\\d"

[Ganeshkumar cheekati]

ankit

still same output:found null

[Ken Truitt]

Then try just \d\d without quotes. On my system, it worked for \d\d and
for "\d\d", but NOT for "\\d\\d", which returned only "found null." My
code was slightly different:

[code]
import java.util.*;
import java.io.*;

public class TestScan {

public static void main(String[] args) {
String token = null;
System.out.println("Input: ");
System.out.flush();
try {
Scanner sc = new Scanner(System.in);
do {
token = sc.findInLine(args[0]);
System.out.println("Found: " + token);
} while (token != null);
System.in.close();
} catch(IOException io) { System.out.println(io.getMessage()); }
}

}
[code]
[ November 11, 2008: Message edited by: Ken Truitt ]