Question

I have a class called A and a class called T. When A clicks a button I want it to update something T. I am having issues doing this… any advice thanks.

Class A:

    FileWriter fstream = new FileWriter("open.txt", true);
    BufferedWriter out = new BufferedWriter(fstream);
    out.write("\n" +number1);
    jLabel1.setText(number1);
    out.close();
    T t = new T();
    t.refresh();

refresh is the function I want to be called to update class T

T:

public void refresh() {
            File file = new File("open.txt");
    try {

        Scanner sc = new Scanner(file);

        if (sc.hasNext()) {
            jTextField2.setText(sc.next());

        } else {
            jTextField2.setText("Nothing to see here");
        }
    } catch (FileNotFoundException e) {
    e.printStackTrace();
}

That’s the function I want it to call. It just doesn’t update the text. I figure it’s something related to how I use the text file. Any ideas thanks.

Answer 1

You’re appending to your file:

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

but reading the first value:

Scanner sc = new Scanner(file);
if (sc.hasNext()) {
   jTextField2.setText(sc.next());

which won’t ever change. I suspect that’s why you’re not seeing changes.

Do you need to write to that file ? Can’t you just call your refresh() method (or an overloaded variant) with the data you’ve just written into the file ?