How does structured concurrency behave in multithreaded code?

        // Example of structured concurrency in Java:

        import java.util.concurrent.*;

        public class StructuredConcurrencyExample {
            public static void main(String[] args) {
                ExecutorService executor = Executors.newFixedThreadPool(2);
                try {
                    Future future1 = executor.submit(() -> {
                        Thread.sleep(1000);
                        return 1;
                    });

                    Future future2 = executor.submit(() -> {
                        Thread.sleep(500);
                        return 2;
                    });

                    // Combining results
                    int result = future1.get() + future2.get();
                    System.out.println("Result: " + result);
                } catch (InterruptedException | ExecutionException e) {
                    e.printStackTrace();
                } finally {
                    executor.shutdown();
                }
            }
        }