Java append/add content to an existing file

Replace vs Append/Add

If you want your code to create a new file and erase previous existing file, FileWriter can simply take it place. To replace all content in an existing file, use this:

FileWriter fstream = new FileWriter(loc);

The code above will delete the existing file if it's name is use in new file being writting.

To append/add something to an existing file, simply specify the second parameter to be true as following:

FileWriter fstream = new FileWriter(loc, true);

This will keep adding content to the existing file instead of creating a new version.

Complete Example
Here is a complete code example to do this. It is nothing particularly important but a quick code reference.

public class Main {
	public static void main(String[] args) throws IOException {
		File dir = new File(".");
		String loc = dir.getCanonicalPath() + File.separator + "Code.txt";
		FileWriter fstream = new FileWriter(loc, true);
		BufferedWriter out = new BufferedWriter(fstream);
		//close buffer writer
Category >> I/O  
If you want someone to read your code, please put the code inside <pre><code> and </code></pre> tags. For example:
String foo = "bar";