Java Write To File,Java Write to File Example,Write to File in Java,How to Write to File

Java Write To File - Java Tutorial

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.

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());

    }

  }

}

Current Comments

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

Can anybody tell me how to append in an existing excel sheet using java. I am able to write in excel but not able to append it.

Posted by Mansiha on Friday, 04.10.09 @ 10:27am | #86697

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How do write a newline to file

Posted by Robert on Sunday, 12.14.08 @ 01:10am | #82731

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This is not good code. You should never write a "catch (Exception e)" block because it is dangerous. It allows exceptions you did not expect to be caught and ignored. This damages the safety of your system.

Also, you are ignoring the exception once it's caught. It would be much better if you declared your method to throw IOException and got rid of the try/catch.

Posted by Bob on Tuesday, 09.30.08 @ 20:05pm | #80805

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can you help how to open the result text file once the script is done ....

Posted by HariKishore on Tuesday, 10.2.07 @ 05:14am | #30897

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Can u provide Complete detail course and with examples so we can understand easyly..
thank u

Posted by santosh on Wednesday, 04.4.07 @ 14:17pm | #13322

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hi can someome please help me???

i want to read out a com port (gps)
and write the data it recieves to a .txt file
can any please help me?????

Posted by dap on Wednesday, 03.21.07 @ 14:28pm | #12346

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i modified it so it accepts some text from the keyboard

package task1_11;
import java.io.*;
public class Task1_11 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try{
BufferedReader bf = new BufferedReader(
new InputStreamReader(System.in));
System.out.println("Save to a file(write some text) : ");
String readin=bf.readLine();

// Create file
FileWriter fstream = new FileWriter("out.txt");
BufferedWriter out = new BufferedWriter(fstream);
out.write(readin);
//Close the output stream
out.close();
}catch (Exception e){//Catch exception if any
System.err.println("Error: " + e.getMessage());
}

}

}

Posted by kasia on Thursday, 03.8.07 @ 19:12pm | #11169

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This is helped me a lot.
But try to modify this to accept data from keyboard and write that data to a new file, that is a dynamic program

Posted by Venkatesh on Wednesday, 02.28.07 @ 14:15pm | #9943

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