ScheduledThreadPoolExecutor

ScheduledThreadPoolExecutor用于定时任务，来支持周期性任务的调度

ScheduledThreadPoolExecutor继承了ThreadPoolExecutor，实现了ScheduledExecutorService。在线程池的基础上，实现了可调度的线程池功能

public class ScheduledThreadPoolExecutorTest {


    public static void main(String agrs[]){
        ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(4);
        //指定时延后开始执行任务，之后每隔period的时长再次执行该任务
        executor.scheduleAtFixedRate(new ThreadTest("Rate"),1,3, TimeUnit.SECONDS);
        //指定时延后开始执行任务，之后任务执行完成后等待delay时长，再次执行任务
        executor.scheduleWithFixedDelay(new ThreadTest("Delay"),1,3,TimeUnit.SECONDS);
        //指定时延后调度执行任务
        executor.schedule(new ThreadTest("schedule"),5,TimeUnit.SECONDS);
    }

    static class ThreadTest implements Runnable{

        private String name;

        public ThreadTest(String name) {
            this.name = name;
        }

        @Override
        public void run() {
            System.out.println(name+" start"+new Date());
            System.out.println();
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(name +" end"+new Date());
        }
    }

}

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