Java write to file. Using a loop

Question

I have a simple application that yet would trash a text file (it\'s just practice) I\'m only 3 days with Java yet. Problem is there are no errors until you run the program then

Answer 1

The problem is that you are closing your FileWriter and trying to use it again.

Instead, close the writer after you've finished the loop:

try (FileWriter file = new FileWriter("hello.txt")) {
  String sb = " ";
  for (int i = 0; i < 1; i++) {  // Note: added a i++
    sb += alphabet.charAt(r.nextInt(N));
    System.out.println(sb);
    int length = sb.length();
    file.write(sb);
    // file.close();   <---- NOPE: don't do this
    if (length == 30) {
      sb = " ";
    }
  }
}

Thanks to Andrew for spotting the i++ omission.