How can I check every 5 secs a file Length with Threads?

Question

As a matter of fact the subject is the main question.
I need your HELP! PLEASEE!!

Answer 1

import java.io.*;
public class RFile implements Runnable {
     public static void main(String args[]) throws Throwable {
          RFile rf = new RFile(new File(args[0]));
          new Thread(rf).start();
     File file = null;
     public RFile(File f) {
          file = f;
     public void run() {
          try {
               while (true) {
                    System.out.println(file.length());
                    Thread.sleep(5000);
          } catch (Throwable err) {};
}