Java Future example

FutureExample.java

ExecutorService executorService = Executors.newSingleThreadExecutor();

Runnable runnableTask = () -> System.out.println("This is a Runnable task");
Future<?> future1 = executorService.submit(runnableTask);
future1.wait();

Callable<String> callableTask = () -> "This is a Callable task";
Future<String> future2 = executorService.submit(callableTask);
String result = future2.get();

executorService.shutdown();