Simple Java Multithreading Example

ExecutorService executor = Executors.newFixedThreadPool(threadAmount);
List<Callable<Object>> tasks = new ArrayList<Callable<Object>>();
 
for (int i = 1; i < 50; i++) {
    tasks.add(Executors.callable(new ActualThread(i)));
}
executor.invokeAll(tasks);
executor.shutdown();  // not really necessary if the executor goes out of scope.
System.out.println("Finished all threads");