import java.util.ArrayList;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class ESMain {

    public static void main(String[] args){
        int nrOfThreads = Runtime.getRuntime().availableProcessors();
        ExecutorService executorService = Executors.newFixedThreadPool(nrOfThreads);

		//class MyTask extends Callable<Integer>
		
		//create and submit tasks
		ArrayList<Future<Integer>> futures = new ArrayList<>();
        for(int i=0; i<10; i++){
            MyTask myTask = new MyTask();
            Future future = executorService.submit(myTask);
            futures.add(future);
        }

		//collect the results
        Integer globalRsult = 0;
        for(Future<Integer> future : futures){
            try {
                Integer localResult = future.get();
                globalRsult += localResult;
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        }

        System.out.println("Global result " + globalRsult);

        executorService.shutdownNow();
    }

}