Closing all child threads when closing the stage

Question

I have multiple instances of child threads which are started and should continue to execute in till the applications exits.
I have classes which extends Task and I create the threads as
new Thread(object of the class).start();
when it comes to interrupting/stoping (dont know which one is correct, please let me know) the threads which should be done inside
primaryStage.onCloseOperation(){}
here i want to end all child threads but since my threads are spreaded across different classes, my not having a clear picture how to achieve this.
I know there is some designing problem, in my application, when it comes to threads, but I am not able to figure out how to resolve out.

Answer 1

Use thread.setDaemon(true) Thread (Java Platform SE 7 )
I suggest to use the Executor Framework and a ThreadFactory, to only need to create a daemon thread once.
Something like this:
Executor executor = Executors.newCachedThreadPool(new ThreadFactory() {
            @Override
            public Thread newThread(Runnable r) {
                Thread thread = new Thread(r);
                thread.setDaemon(true);
                return thread;
And then use it like this:
executor.execute(yourTaskOrRunnable);
When there are only daemon threads running, the JVM will halt and also stop all daemon threads.