创建一个线程池

ExecutorService executorService = Executors.newFixedThreadPool(1);

executorService.submit(() -> System.out.println("run"));
Future stringFuture = executorService.submit(() -> "run");

ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(1);
scheduledExecutorService
.scheduleAtFixedRate(() -> System.out.println("schedule"), 0, 1, TimeUnit.SECONDS);