How to use return value from ExecutorService

Question

I am running a for loop under ExecutorService (which sends emails)

If any of the return type is fail , i need to return return resposne as \"Fail\" or else i need to

Answer 1

It seems that you want to wait for the completion of the task that you've submitted (why use an ExecutorService?)

You can do that by submitting a Callable<T>, the submit method will then return a Future<T>. You can then get() to wait for completion and obtain the result.

Answer 2

Call your getMYInfo(i) in Callable<String>, submit this callable to executor, then wait for competition of Future<String>.

private static ExecutorService emailExecutor = Executors.newSingleThreadExecutor();

public static void main(String[] args) {
    getData();
}

private static void getData() {
    List<Future<String>> futures = new ArrayList<>();
    for (int i = 0; i < 2; i++) {
        final Future<String> future = emailExecutor.submit(new MyInfoCallable(i));
        futures.add(future);
    }
    for (Future<String> f : futures) {
        try {
            System.out.println(f.get());
        } catch (InterruptedException | ExecutionException ex) {
        }
    }
}

public static String getMYInfo(int i) {
    String somevav = "success";
    if (i == 0) {
        somevav = "success";
    } else {
        somevav = "fail";
    }
    return somevav;
}

private static class MyInfoCallable implements Callable<String> {

    int i;

    public MyInfoCallable(int i) {
        this.i = i;
    }

    @Override
    public String call() throws Exception {
        return getMYInfo(i);
    }

}