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Using String Tokenizer

1 reply on 1 page. Most recent reply: Jan 8, 2003 8:20 PM by Ugo Posada

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neo

Posts: 1
Nickname: neo1
Registered: Dec, 2002

Using String Tokenizer

Posted: Dec 27, 2002 3:44 PM

Hello all,
the following code reads from a file and outputs it into another file. I want to using String Tokenizer to output a certain line in the following format.The input file is a .csv file (comma separated)
eg: if a line in the input file is:
344, sadf, 45, fdklj
321, dsff, 49, lkjah
then i want the output to be:
321
dsff
49
fdlkj
if the first column is 321, else the message should be item not found.
The code i have written is as follows:
import java.io.*;

class FileReadTest {

//--------------------------------------------------< main >--------//

public static void main (String[] args) {
FileReadTest t = new FileReadTest();
t.readMyFile();
}

//--------------------------------------------< readMyFile >--------//

void readMyFile() {

String record = null;
int recCount = 0;

try {

FileReader fr = new FileReader("D://bcd.csv");
BufferedReader br = new BufferedReader(fr);

record = new String();

while ((record = br.readLine()) != null) {
recCount++;
System.out.println(recCount + ": " + record);
}

} catch (IOException e) {
// catch possible io errors from readLine()
System.out.println("Eeks, got an IOException error!");
e.printStackTrace();
}

please help me include the string tokenizer.

Ugo Posada

Posts: 37
Nickname: binaryx
Registered: Dec, 2002

Re: Using String Tokenizer

Posted: Jan 8, 2003 8:20 PM

This is what I extracted from the j2se API javadoc

StringTokenizer st = new StringTokenizer("this is a test");
     while (st.hasMoreTokens()) {
         println(st.nextToken());
     }

The only thing you need to do is passing each line to the tokenizer telling the correct delimiter, for instance:

StringTokenizer st = new StringTokenizer("234;789;joe;rachel", ";"); 
 
while (st.hasMoreTokens()) {
         println(st.nextToken());
     }

Then you use what is inside the while loop to do whatever you want to do with each item, for instance, the console output for the last case would be:

234
789
joe
rachel

Regards

Ugo Posada Zabala
Universidad de los Andes
Bogot? - Colombia

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