guava創建線程池

private static ListeningExecutorService executorService = MoreExecutors.listeningDecorator(Executors.newCachedThreadPool());
public static void main( String [] args) throws InterruptedException {
 executorService.submit(()->{
 try {
 Thread.sleep(300);
 System.out.println("abc");
 }
 catch (Exception ex){
 }
 });
 System.out.println("end");

}