reading a particular line

[unoho]

Hi guys, this is a sample input file that my program is supposed to read. (also, i put it as attachment)
467343 23750.40
W 250.00
D 1200.00
W 75.00
I 120.74
W 375.00
D 580.00
I 245.50
W 400.00
W 600.00
D 450.50
W 35.65

where the first line is account number (467343) and opening balance($23750.40)

then i am supposed to input W(withdrawals) and D(Deposits) or I(interest) and do some calculation. Problem is that once i read the first line of the file, i can't read from the second line. It gives me an NoSuchElementException error.

Here is a sample code:

code:

package hossaina_assn02; import java.io.*; import java.text.DecimalFormat; import java.util.StringTokenizer; public class Main {     public static void main(String[] args) throws FileNotFoundException, IOException{         int accountNumber, countDeposit=0, countWithdraw=0;         double openingBalance=0, transValue=0, newBalance=0;         double interest=0, deposit=0, withdraw=0;         char transType;         boolean isServiceCharged = false;         BufferedReader inData = new BufferedReader(new FileReader("account.txt"));         PrintWriter outData;         String inputLine = inData.readLine();         StringTokenizer tokens = new StringTokenizer(inputLine);         DecimalFormat decFormat = new DecimalFormat("0.00");         accountNumber = Integer.parseInt(tokens.nextToken());         openingBalance = Double.parseDouble(tokens.nextToken());         while((inputLine = inData.readLine())!=null){             transType = tokens.nextToken().charAt(0);             System.out.println(transType);             transValue = Double.parseDouble(tokens.nextToken());             switch (transType){                 case 'w':                 case 'W':                     withdraw += transValue;                     countWithdraw++;                     break;                 case 'd':                 case 'D':                     deposit += transValue;                     countDeposit++;                 case 'i':                 case 'I':                     interest += transValue;                     break;             }             newBalance = openingBalance + deposit + interest - withdraw;             if (newBalance <1000 && isServiceCharged == false){                 isServiceCharged = true;                 newBalance -= 25;             }         }         inData.close();         System.out.println(newBalance); } }

any help would be much appreciated
sorry..my code is kinda messy

[DemonWasp]

Your StringTokenizer operates on the first inputLine. Each time you assign to inputLine at the top of your while loop, that's a different actual string, and the StringTokenizer is NOT updated. You need to use either the method in String that returns an array of tokens, or a StringTokenizer you update each time you update inputLine, or a Scanner that you update each inputLine.

[unoho]

umm... we haven't learned Scanner class in school..but i could sure look it up.

but any advice on how to update the StringTokenizer?

[TheGuardian001]

There's no built in method that I know of. Reinitializing may be your only option if you want to keep using StringTokenizer.