Write String as chars to file with DataOutputStream

This is an example of how to write a String as chars to a File using a DataOutputStream. The DataOutputStream lets an application write primitive Java data types to an output stream in a portable way. An application can then use a data input stream to read the data back in. To write a String as chars to a File using a DataOutputStream you should:

  • Create a FileOutputStream to write to the file with the specified name.
  • Create a DataOutputStream with the FileOutputStream.
  • Use writeChars(String s) API method. This method writes a string to the underlying output stream as a sequence of characters.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;


public class WriteStringAsBytesToFileWithDataOutputStream {
	public static void main(String[] args) {
		String filename = "output.txt";
		String output = "Java Code Geeks - Java Examples";
		FileOutputStream fos = null;
		DataOutputStream dos = null;

		try {
			fos = new FileOutputStream(filename);
			dos = new DataOutputStream(fos);
		catch (FileNotFoundException fnfe) {
			System.out.println("File not found" + fnfe);
		catch (IOException ioe) {
			System.out.println("Error while writing to file" + ioe);
		finally {
			try {
				if (dos != null) {
				if (fos != null) {
			catch (Exception e) {
				System.out.println("Error while closing streams" + e);



This was an example of how to write a String as chars to a File using a DataOutputStream in Java.

Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.
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