how to edit my compare method

Question

I want to compare contens of my two txt files and write the different words in other file3.txt file

I want to do compare method in this way to write another txt file. A

Answer 1

I think you have to flush() your writer before closing it.

private static void write(ArrayList out, String fname) throws IOException {
    FileWriter writer = new FileWriter(new File("D:\\Denemeler\\deneme3.txt"));
    for (int i = 0; i < out.size(); i++) {
        writer.write(out.get(i) + "\n");
    }
    // Flush the writer before closing it.
    writer.flush();

    writer.close();
}