Home » Core Java » io » BufferedWriter » Append content to file in Java example

About Byron Kiourtzoglou

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.

Append content to file in Java example

With this tutorial we shall show you how to use FileWriter and BufferedReader classes in odrer to append content to a file using Java. The idea is very simple.You have an already created File that has some content in it and you want to write new content at the end of the existing one.

In order to do that we are going to use the special FileWriter constructor: FileWriter(String fileName, boolean append). So if the second argument is true the file will be opened and the new content that we are going to write into it will be append at the end of the existing one. Note that if you just use the FileWriter(String fileName) constructor the file will be opened and when you try to write new content to the file the old one will be erased.

We have a txt file which already has a sentence written into it:

words.txt:

JavaCodeGeeks is the best!

So, let’s take a look at the code:

package com.javacodegeeks.java.core;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class AppendFileJavaExample {

	private static String filepath="C:\\Users\\nikos7\\Desktop\\words.txt";

	public static void main(String[] args) {
		try {

			String newData = " Java is super cool!";

			FileWriter fileWritter = new FileWriter(filepath, true);

			BufferedWriter bwr = new BufferedWriter(fileWritter);

			bwr.write(newData);

			bwr.close();

			System.out.println("The new content has been successfully appended to the File");

		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

Output:

The new content has been successfully appended to the File

And the content of the file:

words.txt:

JavaCodeGeeks is the best! Java is super cool!

 
This was an example on how to append content to a file in Java.

(No Ratings Yet)
Start the discussion Views Tweet it!

Do you want to know how to develop your skillset to become a Java Rockstar?

Subscribe to our newsletter to start Rocking right now!

To get you started we give you our best selling eBooks for FREE!

 

1. JPA Mini Book

2. JVM Troubleshooting Guide

3. JUnit Tutorial for Unit Testing

4. Java Annotations Tutorial

5. Java Interview Questions

6. Spring Interview Questions

7. Android UI Design

 

and many more ....

 

Receive Java & Developer job alerts in your Area

 

Leave a Reply

avatar
  Subscribe  
Notify of