Java Append File,Append to File Example,Appending to a File in Java,Append to File in Java

Append To File - Java Tutorial

introduction

In the section, you will learn how the data is appended to an existing file. We will use the class FileWriter and BufferedWriter to append the data to a file.

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. This constructor simply overwrite the contents in the file by the specified string but if you put the boolean value as true with the file name (argument of the constructor) then the constructor append the specified data to the file i.e. the pre-exist data in a file is not overwritten and the new data is appended after the pre-exist data.

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",true);

        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

Current Comments

7 comments so far (post your own) View All Comments Latest 10 Comments:

"new" a FileWriter with "true" argument will open a file if it exists.

Posted by vcgu on Thursday, 07.9.09 @ 19:33pm | #89201

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The code only write to a file but not append to a file. Useless and misleading tutorial and a wasting of time.

Posted by Sara Smith on Tuesday, 04.7.09 @ 06:26am | #86581

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Are you guys stupid? this code works great. Thanks for this realy simple tutorial. I wish more tutorials would be as to the point as this one!

Posted by Jules on Wednesday, 12.17.08 @ 07:53am | #82874

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That is NOT APPEND, this does not writes in the end of the file. IT OVERWRITES!!!!!

you suck

Posted by miner on Saturday, 12.13.08 @ 12:22pm | #82723

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hello
i used the above code in 1 of my programs but its not writing data in to the out.temp file.
what i did is that i parsed the xml doc by DOM parser and trying to store the value in the temp file after paring,p[arsing is doing perfect but not writing the data into the temp file.
can you put light on this .
thanks

Posted by ajay on Monday, 09.29.08 @ 12:18pm | #80765

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This is one of the best tutorials I have ever found on the net. Thanks for the good work.