Killing threads on exit

Question

hello,
I'm writing a program that reads in a couple of files which are created by another program.
Sometimes only 1 file will be read, sometimes there will be two.
In some cases even none.
I'm using 2 threads to check if the files exist.
the thread is terminated when it has found a file (with a boolean value and while statement)
My problem is that when only 1 file has been found, the thread will continue to run even if my program is terminated.
Is this supposed to be doing this?
How can i make sure there is nothing more running when the user exits the program?

Answer 1

Since you have not posted the code to get better help; I would suggest roughly to set both threads as Daemon before the threads starts. This will allow the JVM to exist
ex:
public class Main {
     public static void main(String[] args)throws Exception {
          Runnable run = new MyRunnable();
          Thread t = new Thread(run);
     //     t.setDaemon(true); // this will allow the JVM to exit
          t.start();
          Thread.currentThread().sleep(1000);
     class MyRunnable implements Runnable {
          public void run() {
               while(true) {
                    try {
                         System.out.println("here-->" + System.currentTimeMillis());
                         Thread.currentThread().sleep(1000);
                    }catch(InterruptedException interEx) {
                         // Restore the interrupted status
                       Thread.currentThread().interrupt();