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BufferedReader

BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("input.txt")));
             String line = "";
             emptyfile(line, br);
             if ((line = br.readLine()) == null)
             {
                System.out.println("NO RECORD EXISTS IN OUR SYSTEM");
                EXIT();
             }
             while((line = br.readLine()) != null)
             {
                 StringTokenizer st = new StringTokenizer(line, "," );
                 String getCusId = st.nextToken();
                 System.out.println(getCusId);
                 if (getCusId.equals(customerId))
                 {
                     test = true;
                 }


--------------------------------------------------------------------------------
if the text file is like
1212121212,brian,1212// if loop test anf fails
1111122222,chow,1122 //while loop begin
....
....
how can i make the while loop read from the beginning of the text file again thanks for help, i know that may be a very easy question..

0
redsar
Asked:
redsar
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1 Solution
 
CEHJCommented:
Why test first? Just read the file

boolean noRecords = true;
while((line = br.readLine()) != null)
{
     noRecords = false;
     // read the file and get info
}
0
 
redsarAuthor Commented:
i have tried
like this:
             boolean norecord = true;
             while((line = br.readLine()) != null)
             {
                 norecord = false;
                 StringTokenizer st = new StringTokenizer(line, "," );
                 String getCusId = st.nextToken();
                 if (getCusId.equals(customerId))
                     test = true;

              }
             if (norecord)
                //error,
          }
when the text file is null, it come up with error like this,
Exception in thread "main" java.util.NoSuchElementException
it seems it still read the element in the text file , and come upp with error
when using Tokenizer, how come this is not working,
so can i use
 catch(NoSuchElementException e)
          {
             System.out.println("NO RECORD EXIST");
             System.exit()          }
0
 
CEHJCommented:
>>when the text file is null, it come up with error like this,

It can't be 'null' (i assume you mean empty) or it would not be entering the loop. Trim the line to make sure it's not just spaces
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redsarAuthor Commented:
yes, it's an empty
0
 
CEHJCommented:
You can test for empty by a file size of zero.

File f = new File("input.txt");
boolean empty = (f.length() == 0);
System.out.println("File is empty? - " + empty);
0
 
redsarAuthor Commented:
thnaks CHEJ,
0
 
CEHJCommented:
:-)
0
 
redsarAuthor Commented:
sorry, the problem is still there,
i want something like,
if the user select to open an account,
gets a customer Id,and other info, then write that to record.txt
and then if another user wanna open an account open the record.txt check whether the customer Id has already pick up by another user, if yes, error, if no, keep going...
0
 
redsarAuthor Commented:
i got it , thanks
0

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