How to wait for all threads to finish, using ExecutorService?

Question

I need to execute some amount of tasks 4 at a time, something like this:

ExecutorService taskExecutor = Executors.newFixedThreadPool(4);
while(...) {
    tas         


        

Answer 1

You could wrap your tasks in another runnable, that will send notifications:

taskExecutor.execute(new Runnable() {
  public void run() {
    taskStartedNotification();
    new MyTask().run();
    taskFinishedNotification();
  }
});