Java8-Executors-No.01

import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.TimeUnit;public class Executors1 {    public static void main(String[] args) {        test1(3);//        test1(7);    }    private static void test1(long seconds) {        ExecutorService executor = Executors.newSingleThreadExecutor();        executor.submit(() -> {            try {                TimeUnit.SECONDS.sleep(seconds);                String name = Thread.currentThread().getName();                System.out.println("task finished: " + name);            }            catch (InterruptedException e) {                System.err.println("task interrupted");            }        });        stop(executor);    }    static void stop(ExecutorService executor) {        try {            System.out.println("attempt to shutdown executor");            executor.shutdown();            executor.awaitTermination(5, TimeUnit.SECONDS);        }        catch (InterruptedException e) {            System.err.println("termination interrupted");        }        finally {            if (!executor.isTerminated()) {                System.err.println("killing non-finished tasks");            }            executor.shutdownNow();            System.out.println("shutdown finished");        }    }}