How can I create a new thread only if no other threads are currently open?

Question

This code creates and starts a thread:

new Thread() {
    @Override
    public void run() {
        try { player.play(); }
        catch ( Exception e ) { Sy         


        

Answer 1

My preferred method would be putting a synchronized keyword on the play method

synchronized play()

synchronized methods will lock the function so only one thread will be allowed to execute them at a time.

Here's some more info https://docs.oracle.com/javase/tutorial/essential/concurrency/syncmeth.html