// Import necessary classes
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
import java.util.concurrent.ExecutionException;

// HelloWorldCallable class implementing the Callable interface
public class HelloWorldCallable implements Callable<String> {

    @Override
    public String call() throws Exception {
        // Return a value when the thread completes
        return "Hello, World from a Callable!";
    }

    public static void main(String[] args) throws InterruptedException, ExecutionException {
        // Create a FutureTask that wraps the HelloWorldCallable
        FutureTask<String> futureTask = new FutureTask<>(new HelloWorldCallable());

        // Create a new Thread with the FutureTask
        Thread myThread = new Thread(futureTask);

        // Start the thread
        myThread.start();

        // Get the result of the computation
        String result = futureTask.get();
        System.out.println(result);
    }
}