Example4.java

import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class Example4 {
    public static void main(String[] args) throws InterruptedException, ExecutionException {
        Future<String> future = fetchData(20);
        //Bloqueo de la tarea
        String data = future.get();
        System.out.println(data);
        synchronousTask2();
    }

    public static Future<String> fetchData(Integer id){
        ExecutorService service = Executors.newSingleThreadExecutor();
        return service.submit(() -> {
            Thread.sleep(3000);
            service.shutdown();
            System.out.println("Tarea finalizada");
            return "Datos obtenido del id: "+id;
        });
    }



    public static void synchronousTask1() throws InterruptedException {
        System.out.println("Obtuve datos");
        Thread.sleep(10000);
    }

    public static void synchronousTask2(){
        System.out.println("Calcular IVA");
    }
}