When to use which Writer subclass in Java; common practices

Question

I have always been slightly confused with the amount of different IO implementations in Java, and now that I am completely stuck in my project development, I was taking my time

Answer 1

You can create an appending PrintWriter like this:

OutputStream os = new FileOutputStream("/tmp/out", true);
PrintWriter writer = new PrintWriter(os);

Edit: Anon's post is right about both using a BufferedWriter in between and specifying the encoding.