How to add a new line of text to an existing file in Java? [duplicate]

Question

I would like to append a new line to an existing file without erasing the current information of that file. In short, here is the methodology that I am using the current time:

import java.io.BufferedWriter; import java.io.FileWriter; import java.io.Writer;  Writer output; output = new BufferedWriter(new FileWriter(my_file_name));  //clears file every time output.append("New Line!"); output.close(); 

The problem with the above lines is simply they are erasing all the contents of my existing file then adding the new line text.

I want to append some text at the end of the contents of a file without erasing or replacing anything.

Answer 1

you have to open the file in append mode, which can be achieved by using the FileWriter(String fileName, boolean append) constructor.

output = new BufferedWriter(new FileWriter(my_file_name, true)); 

should do the trick

Answer 2

The solution with FileWriter is working, however you have no possibility to specify output encoding then, in which case the default encoding for machine will be used, and this is usually not UTF-8!

So at best use FileOutputStream:

    Writer writer = new BufferedWriter(new OutputStreamWriter(         new FileOutputStream(file, true), "UTF-8"));