How can I use ExecutorService with Callable in Java?

How can I use ExecutorService with Callable in Java?

You can use ExecutorService to manage a pool of threads and Callable to execute tasks that return a result. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

import java.util.concurrent.*;

public class CallableExample {
    public static void main(String[] args) throws InterruptedException, ExecutionException {
        ExecutorService executor = Executors.newFixedThreadPool(2);
        Callable<Integer> task = () -> {
            Thread.sleep(1000);
            return 123;
        };
        Future<Integer> future = executor.submit(task);
        System.out.println("Result: " + future.get());
        executor.shutdown();
    }
}

What happens if the Callable task throws an exception?

If the Callable task throws an exception, the Future's get() method will throw an ExecutionException. You can catch it to handle the error.