Question

I have the following function for writing to a file:

public void writeToFile(String data) throws IOException {
    FileWriter fstream = null;


    try {
        fstream = new FileWriter("out.txt");
        BufferedWriter out = new BufferedWriter(fstream);
        out.write(data);
        //Close the output stream
        out.close();
    } catch (IOException ex) {
        Logger.getLogger(test.class.getName()).log(Level.SEVERE, null, ex);
    } finally {
        try {
            fstream.close();
        } catch (IOException ex) {
            Logger.getLogger(test.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

What it does every time it is called it creates a new file and writes a new line. What I want to achieve is to check whether file exist. If not create a new file and write something, if exists then open the file and add a new line without erasing existing text. How to do that?

Answer 1

change your FileOutputStream constructor call to this:

fstream = new FileWriter("out.txt", true);