How to add new line of text by button?

Question

I have a public method that adds some text from textfield into .txt file, although it works only once. I want that button to add new line of text everytime I click the button (so we can change text in textfield and add it to new line...).

    try {
        ncw = new PrintWriter("database.txt");
        ncw.write(nctext.getText());
        ncw.close();
    } catch (IOException ae) {
        System.out.println("IO Exception");
    }
}

What should I do?

Lilo · Accepted Answer · 2016-10-13T21:28:34.727

0

Try this, the second boolean parameter tells FileWriter if it will append or overwrite

true = append mode

false= overwrite mode

FileWriter fw = null;
BufferedWriter bw = null;
PrintWriter out = null;
try{

        fw = new FileWriter("database.txt", true);
        bw = new BufferedWriter(fw);
        out = new PrintWriter(bw);

                    out.println(nctext.getText());
                    out.flush();
                    out.close();


   } catch (IOException e) {
                   e.printstacktrace();}

edited Oct 13 '16 at 21:28

answered Oct 13 '16 at 21:22

Lilo

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but that deletes the existing text – ItamarG3 Oct 13 '16 at 21:26
"true" parameter totally works! THX – Sheb Oct 13 '16 at 21:27
if you pass true it will write in append mode – Lilo Oct 13 '16 at 21:27
@ItamarGreen it – Sheb Oct 13 '16 at 21:28
@ItamarGreen Sorry I've just pressed enter accidentally. It should looks like that: try { ncw = new FileWriter("base.txt", true); ncbw = new BufferedWriter(ncw); ncbw.newLine(); ncbw.write(nctext.getText()); ncbw.newLine(); ncbw.close(); } catch (IOException ex) { System.out.println("IO Exception"); } } – Sheb Oct 13 '16 at 21:29

How to add new line of text by button?

1 Answers1