Codes

[siddharthrgade21-a11y]

import java.util.concurrent.*;
import java.math.BigInteger;

public class AdvancedConcurrency {

public static BigInteger calculateFactorial(int n) {
    BigInteger result = BigInteger.ONE;
    for (int i = 1; i <= n; i++) {
        result = result.multiply(BigInteger.valueOf(i));
    }
    return result;
}

public static void main(String[] args) {
    ExecutorService executor = Executors.newSingleThreadExecutor();
    // Submitting a Callable task to the executor
    Future<BigInteger> futureResult = executor.submit(() -> {
        System.out.println("Calculation started in a separate thread...");
        BigInteger factorial = calculateFactorial(50); // A moderately large number
        Thread.sleep(1000); // Simulate some delay
        return factorial;
    });

    // Main thread continues execution
    System.out.println("Main thread is doing other work...");

    try {
        // Get the result from the Future (this call blocks until the result is ready)
        BigInteger result = futureResult.get();
        System.out.println("Result received: " + result.toString().substring(0, 50) + "...");
    } catch (InterruptedException | ExecutionException e) {
        e.printStackTrace();
    } finally {
        executor.shutdown(); // Always shut down the executor
    }
}

}