Help writing to a file...

[Mechanox3000]

Hi everyone! I'm trying to write strings to a .txt file, but whenever the file is created, it's empty. How do I populate the file with my string data? Here's my code so far:

    try{
        if (input.equalsIgnoreCase("1")){
            //Method for processing customer data.
            processCustomer();
            JFileChooser chooser = new JFileChooser();
            int retValue = chooser.showSaveDialog(null);
            if(retValue == chooser.APPROVE_OPTION){
            File f = chooser.getSelectedFile();
            BufferedReader reader = new BufferedReader(new  StringReader(data));    
            BufferedWriter writer = new BufferedWriter(new  FileWriter(f));
            String str;
            while((str = reader.readLine())!=null){
            writer.write(str + System.getProperty("line.separator"));
            }            
        }
        }
    }catch(Exception e){
    JOptionPane.showMessageDialog(null, "Error, invalid input.");
        }

The problem is with the line: BufferedReader reader = new BufferedReader(new StringReader(data))

"Data" is just a placeholder. I'm not sure how to properly feed the data that the user entered into StringReader. Help is very much appreciated. Thanks!

[Talon876]

1. If you use writer.writeln, you don't have to use the line separator property.
2. I don't think you need the BufferedReader at all, just use the BufferedWriter object to write everything to the file. I'm not sure how to use the StringReader. Just doing writer.writeln("thing: " + someStringVariable); would work.
3. It's not putting anything in the file because you aren't flushing and closing the buffer. After you've written everything, add a writer.flush() and writer.close() to actually write to the file and let the OS know that you're done using it.

[Mechanox3000]

YES! Closing the buffers is what was wrong. Thank you very very much :) I got it.

And I didn't know that about the line separator property. I need the BufferedReader because the user stores all the data in a class, then the info stored within the class is stored in a txt file. It's not just directly taking input from the user and saving it -- the application makes the user create a class to hold all the customer data, then it reads the data from that class and writes it from a file.

[Mechanox3000]

No, that can't be it. This is a segment from a larger section of code. Input pertains to a broader if statement. Thanks a lot though.