Have you used the Callable interface for executing tasks in Java?

Yes, the Callable interface in Java is used for executing tasks that return a result and can throw exceptions. Unlike Runnable, Callable allows you to obtain the result of execution through Future.

Example of using Callable:

import java.util.concurrent.*;

public class CallableExample {
    public static void main(String[] args) throws Exception {
        ExecutorService executor = Executors.newSingleThreadExecutor();

        Callable<Integer> task = () -> {
            // Some computational task
            Thread.sleep(1000);
            return 123;
        };

        Future<Integer> future = executor.submit(task);

        System.out.println("Task started");

        Integer result = future.get(); // Waiting for the result
        System.out.println("Result: " + result);

        executor.shutdown();
    }
}

This approach is convenient for asynchronous execution of tasks with the ability to get the result and handle exceptions.