How to declare Futures in Java without warnings?

Question

Trying to use Futures and IntelliJ is giving me various warnings, not sure how to code it 'correctly'. The code works but obviously want to learn best practice.

try {
    public void  futuresTest() {
        try {
            List<String> valuesToProcess = List.of("A","B","C","D","E");
            
            ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
            List<Future<MyObject>> futures = new ArrayList<>();

            for(String s : valuesToProcess) {
                futures.add((Future<MyObject>) executor.submit(new MyObject(s)));     //<THIS
            }

            LOG.info("Waiting for threads to finish...");
            boolean termStatus = executor.awaitTermination(10, TimeUnit.MINUTES);
            
            if (termStatus) {
                LOG.info("Success!");
            } else {
                LOG.warn("Timed Out!");
                for(Future<MyObject> f : futures) {
                    if(!f.isDone()) {
                        LOG.warn("Failed to process {}:",f);
                    }
                }
            }

        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }

Gives Unchecked cast: 'java.util.concurrent.Future<capture<?>>' to 'java.util.concurrent.Future<model.MyObject>'

            List<Future> futures = new ArrayList<>();

            for(String s : valuesToProcess) {
                futures.add(  executor.submit(new MyObject(s)));
            }

Gives Raw use of parameterized class 'Future'

is it just supposed to be List<Future<?>> futures = new ArrayList<>(); that has no warnings but I would think I should be specifying my Object.

Answer 1

Based on the comments it does sound like the correct approach is

List<Future<?>> futures = new ArrayList<>();

for(String s : valuesToProcess) {
    futures.add(executor.submit(new MyObject(s)));
}