Write byte to file with BufferedOutputStream

With this example we are going to demonstrate how to write a byte to a file with BufferedOutputStream. This class implements a buffered output stream. By setting up such an output stream, an application can write bytes to the underlying output stream without necessarily causing a call to the underlying system for each byte written. In short, to write a byte to a file with BufferedOutputStream you should:

  • Create a FileOutputStream to write to the file with the specified name.
  • Create a BufferedOutputStream for the FileOutputStream.
  • Use write(byte b) API method. It writes the specified byte to this buffered output stream.

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

package com.javacodegeeks.snippets.core;

import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class WriteByteToFileWithBufferedOutputStream {
	public static void main(String[] args) {
		String filename = "output.txt";
		BufferedOutputStream bos = null;
		FileOutputStream fos = null;

		try {
			// create FileOutputStream from filename
			fos = new FileOutputStream(filename);

			// create BufferedOutputStream for FileOutputStream
			bos = new BufferedOutputStream(fos);

			byte b = 23;
		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 (bos != null) {
			catch (Exception e) {
				System.out.println("Error while closing streams" + e);



This was an example of how to write a byte to a file with BufferedOutputStream 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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