Thread: How to Read a Portion of a File in Java?

Hi folks,

Output Should be:

Date Bill Bill DateDescript Frm To Dist pur Qty @ Amt Rmk

01/02/08 256 01/02/08 Ring Hyd Bng 100 xyz 100 abcd 100 top
02/05/08 325 05/02/08 paper Chnn Bng 25 offi 850 kir 1000 good
11/05/08 898 21/08/08 pen Hyd Pun 2532 Offi 200 Abv 500 Bad
11/02/08 998 21/08/08 Pencil Mum Bng 258 Off 205 Acc 600 Good
02/05/08 968 30/08/08 Bag Hyd Bng 265 Xyz 536 Acc 635 Bad

Hey jazz2k8,

I would suggest using Regular expressions to do this.

This should get you started:

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Expense {
 
 public static String inputFile = "expense.txt";
 
 public void formatFile() {
 
  try
  {
  FileInputStream in = new FileInputStream(inputFile);
  BufferedReader br = new BufferedReader(new InputStreamReader(in));
  String strLine;
 
  String regEx1 = "([0-9]/)"; 
  Pattern regEx1P = Pattern.compile(regEx1);
 
  System.out.println("Date     " + "Bill   " + "BillDate " + "Descript" + " Frm   " +
    "To  " + "Dist   " + "pur   " + "Qty " + " @  " + "Amt    " + "Rmk");
 
  while((strLine = br.readLine())!= null)
  {   
   Matcher match1 = regEx1P.matcher(strLine);
 
   if (match1.find())
   {
    System.out.println(strLine);
   }
 
   //System.out.println(strLine);
  }
  }
  catch (Exception e)
  {
   System.out.println("Ouch! " + e);
  }
 }
 
 public static void main(String[] args) {
  Expense exp = new Expense();
  exp.formatFile();
 
 }
}