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Java Write To File - Java Tutorial

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In the section of Java Tutorial you will learn how to write java program to write to a file.

Java Write To File - Java Tutorial

Learn how to write to a file from Java program. This tutorial teaches you how you can use the OutputStreamWriter on a FileOutputStream classes to write data to a file from Java program.

     

In the section of Java Tutorial you will learn how to write java program to write to a file. We will use the class FileWriter and BufferedWriter to write to a file.

Class FileWriter
The FileWriter is a class used for writing character files. The constructors of this class assume that the default character encoding and the default byte-buffer size are acceptable. To specify these values yourself, construct an OutputStreamWriter on a FileOutputStream.

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BufferedWriter

The BufferWriter class is used to write text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings.

Here is the code of java program to write text to a file:

import java.io.*;
class FileWrite 
{
 public static void main(String args[])
  {
  try{
  // Create file 
  FileWriter fstream = new FileWriter("out.txt");
  BufferedWriter out = new BufferedWriter(fstream);
  out.write("Hello Java");
  //Close the output stream
  out.close();
  }catch (Exception e){//Catch exception if any
  System.err.println("Error: " + e.getMessage());
  }
  }
}

Download the code

If you execute the above code program will write "Hello Java" into out.txt file. While creating the object of FileWriter class we have passed the name of the file e.g. "out.txt" as constructor argument.

The BufferedWriter class takes FileWriter object as parameter. The write() method of the BufferedWriter class actually writes the data into the text file.

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Posted on: June 5, 2007

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Comments:35
Rahul Raj
July 20, 2012
java tutorials

your site is so helpfull. thank you for creating like this.
md.rahid islam
July 30, 2012
how to making ajava programimg file

how to making ajava programimg lpz give me not
md.rahid islam
July 30, 2012
ajava programimg

how to making ajava programimg file give me the letter
Z
August 9, 2012
Tags?

Why so many?
Maarten
December 7, 2012
Java Write To File - Java Tutorial

Why not put the out.Close() in a finally?
Starkiller2
November 28, 2012
Thank you!

I was having problems with IO and after scrutinizing this code I realized that try blocks should contain ALL IO stuff. Then I was having variable problems because I used multiple try-catch blocks, and the variables did not carry over from one block to another.
Seetha
July 12, 2013
how to read and write excel file in java

hi
kaliso kalawe
January 21, 2014
java file handling

need help for java subject
Fizza
May 25, 2014
how to append

this code works fine for me but it overwrites everything that is written in the file befor, how can i appned at the end of file ?
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