Run a new thread and don't wait this thread finish

Question

I am new to the Threading, so if please give me an advice for my case.

I would like create a new thread to do something and I don't care this thread can do complete or not.

I intend to use ExecutorCompletionService to do my job but this class is not suitable for me. It must call take or poll to drain a queue to avoid memory leak. So, this means I must wait until the thread complete. I read this from this question

This is the current code

ExecutorService executor = Executors.newCachedThreadPool();

CompletionService<Entity> completion = new ExecutorCompletionService<>(executor);

DoSomeThingClass doSomething = getInstance();

completion.submit(doSomething);

executor.shutdown();

// Continue to do other job and I don't care whenever doSomeThing is complete.
// However when doSomeThing finish, I don't need to do anything to avoid memory leak

For that reason, please give me an approach for my case and some skeleton code for example.

Thank you so much

Answer 1

I can resolve my problem as the following code

public static void main(
    String[] args) {
    ExecutorService executor = Executors.newCachedThreadPool();
    executor.execute(new Runnable() {
        @Override
        public void run() {
            try {
                TimeUnit.SECONDS.sleep(2);
            } catch (InterruptedException e) {

            } finally {
                System.out.println("Thread 2 is finished");
            }
        }
    });
    executor.shutdown();
    System.out.println("Thread 1 is finished");
}