Only one thread at a time!

Question

Hey there!

Here's my code:

new Thread() {
    @Override
    public void run() {
        try { player.play(); }
        catch ( Exception e ) { System.out.println(e); }
    }
}.start();

which creates and starts a thread. I'd like to modify this code so that the thread only starts if there are no other threads open at the time! If there are I'd like to close them, and start this one. Thanks in advance!

Answer 1

You can create an ExecutorService that only allows a single thread with the Executors.newSingleThreadExecutor method. Once you get the single thread executor, you can call execute with a Runnable parameter:

Executor executor = Executors.newSingleThreadExecutor();
executor.execute(new Runnable() { public void run() { /* do something */ } });

Answer 2

you could create a static data member for the class(where threading takes place) which is incremented each time an object of that class is called,read that and u get the number of threads started