Home Java Beginners Line Number Reader Example
Questions:Ask|Latest

 
 

Share on Google+Share on Google+

Line Number Reader Example

Advertisement
Here, providing you an example that reads a file line by line.

Line Number Reader Example

     

In this example we are reading  number of lines.

In this example we are reading a file from system .Then we are reading number of lines in this file. FileReader class provides readLine() method.The  readLine() method is used to read the data line by line. LineNumberReader class is provide getLineNumber() method to get the number of line. We are using File(String file_name) constructor to make an object of file. We are reading file by use of FileReader(File file) constructor. We are using LineNumberReader(FileReader filereader) constructor to create an object of LineNumberReader class.

The methods used in this example:

getLineNumber():
This method is used to get the number of line.

readLine():
This method is used to read the data line by line. Then returns the data of a line as a single string.

The code of the program is given below:

import java.io.*;
public class LineNumberReaderExample{
  public static void main(String[] argsthrows Exception{
  File file = null;
  FileReader freader = null;
  LineNumberReader lnreader = null;
  try{
  file = new File("LineNumberReaderExample.java");
  freader = new FileReader(file);
  lnreader = new LineNumberReader(freader);
  String line = "";
  while ((line = lnreader.readLine()) != null){
  System.out.println("Line:  " + lnreader.
getLineNumber
() ": " + line);
  }
  }
  finally{
  freader.close();
  lnreader.close();
  }
  }
}

The output of the program is given below:

C:\convert\rajesh\completed>javac LineNumberReaderExample.java
C:\convert\rajesh\completed>java LineNumberReaderExample
Line:  1: import java.io.*;
Line:  2: public class LineNumberReaderExample{
Line:  3:       public static void main(String[] args) 
throws Exception{
Line:  4:               File file = null;
Line:  5:               FileReader freader = null;
Line:  6:               LineNumberReader lnreader = null;
Line:  7:               try{
Line:  8:                       file = new File("
LineNumberReaderExample.java");
Line:  9:                       freader = new FileReader(file);
Line:  10:                      lnreader = new 
LineNumberReader(freader);
Line:  11:                      String line = "";
Line:  12:                      while ((line = 
lnreader.readLine()) != null){
Line:  13:                              System.out.
println("Line:  " + lnreader.
getLineNumber() + ": " + line);
Line:  14:                      }
Line:  15:              }
Line:  16:              finally{
Line:  17:                      freader.close();
Line:  18:                      lnreader.close();
Line:  19:              }
Line:  20:      }
Line:  21: }

Download this example.

Advertisements

If you enjoyed this post then why not add us on Google+? Add us to your Circles



Liked it!  Share this Tutorial


Follow us on Twitter, or add us on Facebook or Google Plus to keep you updated with the recent trends of Java and other open source platforms.

Posted on: June 29, 2007

Related Tutorials

Ask Questions?    Discuss: Line Number Reader Example   View All Comments

Post your Comment


Your Name (*) :
Your Email :
Subject (*):
Your Comment (*):
  Reload Image
 
 
Comments
Amalendu Kaity
December 5, 2011
Java Printing

Dear Sir, My question is,that, suppose 4 (four) pages are to be printed out and 5 rows will be printed on each page and every last row will be reserved for the total among 5 rows, Again each total will be transfered to the first line of the every next page respectively and each new total will be calculated with previous total in every page. This code of printing out will be using JAVA language. I shall be greatfull to you for it's solution. Yours faithfully Amalendu Kaity
Aylin
June 4, 2012
THANK YOU

This helped alot :)
DMCA.com